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Meetings of the BBS - 1973

 

Spring Field Meeting 1973

Whalley, 31 March - 7 April

The spring meeting (31 March-7 April) was held at Whalley, nr. Clitheroe (v.-c. 59) where the Blackburn Diocesan Retreat and Conference House, a late sixteenth century manor house in the midst of the ruins of the Cistercian Abbey, provided a picturesque and unique headquarters. The twenty-eight participants had the opportunity to explore v.-c's 59 and 60, neglected since the days of Wheldon and Wilson, as well as little-known parts of v.-c. 64.

1 April. On the first morning members devoted their attentions to Worsaw Hill, the highest and most extensive limestone outcrop in v.-c. 59. The broken limestone turf yielded Cephaloziella hampeana, Lophozia bicrenata*, Scapania aspera* and Mnium affine* whilst Bryum elegans* grew in rock crevices. Those deterred by driving wind and rain discovered Plagiothecium succulentum on a hedge bank and Trichostomum sinuosum* in a culvert. In brighter weather, in the afternoon, an assault was made on Pendle Hill, the highest ground in v.-c. 59. Ascending by way of Hooke Cliff where finds included Gyroweisia tenuis* in a rock crevice, Dicranella cerviculata, Hypnum lindbergii, Pohlia delicatula c. fr. and Seligeria recurvata, the party headed for the top of Mearley Clough recording in Juncus marshes en route Haplomitrium hookeri*, Pellia neesiana*, Acrocladium stramineum and Mnium pseudopunctatum. The Upper Clough provided Blepharostoma trichophyllum, Nardia compressa, Lophozia incisa*, Scapania scandica*, Tritomaria quinquedentata* (the last three all on earthy banks), and Pohlia rothii* in streamside gravel. On the lower wooded slopes Scapania umbrosa, Bryum flaccidum* (on an elm root) and B. ruderale* (on an earth-covered stone) were recorded. A late sortie to Ings Beck at Downharn Bridge (v.-c. 64) yielded Barbula spadicea c. fr., Bryum radiculosum, Hygroamblystegium fluviatile and H. tenax on a silt-covered elm by the stream.

[* New vice-county record]

2 April. Torrential rain led members to choose the relatively sheltered Hodder Valley as a venue. Different parties covered various stretches of the river from near Great Mitton to Dunsop Bridge, although spate conditions prevented exploration of many waterside habitats. On the west bank above Lower Hodder Bridge (v.-c. 60) finds included Trichostomum tenuirostre* on wet rocks, Plagiothecium denticulatum var. denticulatum* on a rotten log, Philonotis calcarea and Pohlia wahienbergii, both c. fr. on a calcareous mudslip and Dicranella staphylina* in a field. Noteworthy records from the east bank at Higher Hodder (v.-c. 64) were Dicranum strictum, Dicranodontium denudatum (on a log), Ephemerum serratum var. minutissimum, Fissidens exilis and Isopterygium depressum. Doeford Bridge (v.-c. 60) provided Amblystegium varium and Campylopus introflexus* and limestone rocks west of Whitewell (v.-c. 60) Bryum elegans*. Those who investigated the wooded gorges near Sandal Holme (v.-c. 64) were rewarded with Metzgeria conjugata, Porella laevigata, P. cordaeana, Orthotrichum lyellii (a single depauperate tuft), Orthothecium intricatum, Rhynchostegiella teesdalei, Seligeria pusilla and, in a field. Weissia rostellata.

3 April. The day was spent exploring the sand dunes between Formby and Ainsdale (v.-c. 59) where the wardens of the Nature Reserve provided expert guidance to the most promising habitats. Without their help and enthusiasm it is doubtful whether the best slacks could have been located in the limited time available. Although members who had previous knowledge of this dune system expressed disappointment at the deterioration caused by the falling water table, in the few wet slacks remaining, the party still managed to find Acrocladium giganteum, Bryum neodamense c. fr., Catoscopium nigritum* c. fr., Distichium inclinatum c. fr., Drepanocladus aduncus, D. lycopodioides, D. revolvens var. intermedius, D. sendtneri var. sendtneri and var. wilsonii and Meesia uliginosa c. fr. The pine plantations at the rear of the dunes yielded Cephaloziella rubella*, Eurhynchium megapolitanum, Leptobryum pyriforme and Plagiothecium curvifolium*.

4 April. The first stop was at Stocks Reservoir (v.-c. 64), where a diligent search along the margins, in driving rain, produced Pellia neesiana, Scapania irrigua, Archidium alternifolium, five species of erythrocarpous Brya including B. bornholmense*, Dicranella rufescens, Pohlia bulbifera, Weissia microstoma var. brachycarpa and W. rostellata. Nowellia curvifolia Dicranum strictum, Hypnum cupressiforme var. mamillatum and Plagiothecium latebricola (on a fern stool) were seen in adjacent woodland. The party then divided. Those who visited Holden Clough (v.-c. 64) found some shelter and Metzgeria conjugata, Eurhynchium praelongum var. stokesii, Rhytidiadelphus loreus c. fr., Seligeria pusilla and S. recurvata. Depauperate specimens of Metzgeria fruticulosa, Orthotrichum diaphanum and Ulota bruchii were located amidst abundant Aulacomnium androgynum and Dicranoweisia cirrata on old elders. Others who explored the environs of Otterburn near Hellifield (v.-c. 64) were rewarded with Amblystegium varium, Gymnostomum calcareum, Rhynchostegiella teesdalei and Tortula subulata var. graeffii. Solenostoma sphaerocarpum and Atrichum crispum were also seen by a stream near the top of Newton Fell (v.-c. 64).

5 April. Members worked the Roeburndale and Hindburndale in v.-c. 60. The banks of the Roeburn south of Wray produced Blasia pusilla, Lejeunea lamacerina var. azorica, L. ulicina, Saccogyna viticulosa, Scapania umbrosa, Amblystegium juratzkanum, Bartramia Ithyphylla, Dichodontium pellucidum c. fr., Seligeria recurvata, Sphagnum girgensohnii and Tetraphis browniana, whilst Bryum rubens* was discovered in a field. Noteworthy finds later in the day included Metzgeria fruticulosa* on an elder, Plagiothecium curvifolium* on a stump, Zygodon conoideus and Z. viridissimus var. stirtonii at Furnessford Bridge, Pohlia lutescens* at Botton Mill, Hypnum imponens* on the peat of Loftshaw Moss and Plectocolea paroica* in a rocky gully by the Helks Bank Farm. One individualist who went in search of culture in the Bronte country found Atrichum crispum and Discelium nudum by a. stream at Wycoller (v.-c. 59).

6 April. The last day was devoted to Upper Wyredale and the Trough of Bowland, although one member waiting for the main contingent to emerge from a leisurely breakfast found Bryum radiculosum* on a wall in the Abbey grounds (v.-c. 59). Ascent of Tambrook Fell via the banks of the Tarnbrook Wyre (v.-c. 60) produced Pellia neesiana* in a marsh, Plagiothecium laetum* c. fr. in a rocky gully, and Calypogeia neesiana var. meylanii, Cephalozia media, Cephaloziella subdentata*, Lepidozia sylvatica* and L. trichoclados on peaty banks. Other finds included Dicranodontium denudatum, Dicranum fuscescens, Lepidozia pinnata, Scapania gracilis, and fine Discelium nudum c. fr. on a clay bank. To the dismay of those who reached the summit the gritstone rocks there were completely devoid of bryophytes. Other stops yielded Fontinalis squamosa in the river, and Plagiothecium ruthei* in a swamp at Abbeysteads (v.-c. 60), Calypogeia neesiana var. neesiana*, Lepidozia pearsonii, Odontoschisma denudatum and O. sphagni on peat cuttings in the blanket bog of Blaze Moss (v.-c. 60), and Calypogeia trichomanis* in a roadside ditch above Marshaw (v.-c. 60). A final venture into an old limestone quarry near Ram's Clough (v.-c. 64) produced Preissia quadrata, Bryum pallescens, Ptychomitrium polyphyllum and Weissia controversa var. densifolia.

The meeting produced nearly forty new vice-county records and ten well-worked grid squares. Although some members were surprised by the beauty of the countryside in an area so close to the industrial areas of Lancashire and Yorkshire, none failed to notice the effects of atmospheric pollution on the bryophyte flora. The barren smoke-blackened gritstone crags and the trees almost totally devoid of epiphytes apart from Aulacomnium androgynum and Dicranoweisia cirrata in an otherwise unspoiled rural area will long be remembered. Particular thanks for the success of the meeting must go to Miss Gradwell and the staff of Whalley Abbey for their meticulous attention to the singular requirements of bryologists. We are also most grateful to the many kind owners who gave us permission to visit their properties.

JEFFREY G. DUCKETT

 

Summer Field Meeting 1973

Ravenglass, 1-8 September

The Summer Meeting (1-8 September) was held at Ravenglass on the Cumberland coast (v.-c. 70). The main objective of this meeting was to aid the mapping scheme as records are rather sparse from the western edge of the Lake District. During the week ten localities were visited in v.-c's 69 and 70 and records obtained for eight 10-km squares. A number of areas designated as Sites of Special Scientific Interest by the Nature Conservancy were visited and species lists are being supplied for their records.

2 September. The first day was spent exploring Dalegarth woods, Stanley Ghyll and the area around Birker Force. These are areas of wooded ravine near the village of Boot in Eskdale (v.-c. 70). Although quite spectacular the gorges proved less rich than was at first thought. On the woodland edge large mounds of Mylia taylori were found, whilst the boulders in the gorge were dominated by Isothecium holtii. Good specimens of fruiting Isopterygium elegans were seen and Fissidens curnowii was collected from rocks by the river. Near Whillan Beck, Boot (v.-c. 70) Leucobryum juniperoideum was seen in woodland together with Solenostoma sphaerocarpum.

3 September. The intention on this day was to work the dunes and slacks of the Walney lsland/Roanhead area near Barrow-in-Furness (v.-c. 69) but continuous heavy rain made field work impossible. However, all was not lost, a short trip produced Riccardia incurvata* and Bryum knowltonii* from sandy ground by a pool on Walney Island and a short excursion along the shore by Ravenglass (v.-c. 70) yielded Anthoceros laevis* and Tortella flavovirens.

[* New vice-county record]

4 September. In better weather the party explored the woods and river valley of the Duddon and an afternoon excursion was made to Seathwaite Tarn. On entering the area near Seathwaite Church (v.-c. 69) Bryum alpinum var. viride was discovered on some large boulders whilst a group burrowing in a small bog containing Sphagnum papillosum, S. subsecundum var. inundatum and Odontoschisma sphagni, discovered Cryptothallus mirabilis. The river gorge on v.-c. 69/70 border proved very acidic with quantities of Andreaea rupestris on the boulders. Small flushed areas under the crags (v.-c. 69) gave a little variation where, in association with fine clumps of Osmunda regalis, Fissidens adianthoides, F. osmundoides, Amphidium mougeotii, Ctenidium molluscum and Saccogyna viticulosa were found to be locally abundant. Little of note was found at Seathwaite Tarn (v.-c. 69) although good specimens of common species such as Oligotricihum hercynicum, Polytrichum aloides and Nardia compressa were seen. Other hepatics observed there included Gymnomitrion obtusum, Cephaloziella starkei and, near the Tarn edge, Anthelia julacea.

5 September. This was a free day which was spent examining a range of habitats including Wasdale Screes (v.-c. 70), Haile Great Wood (v.-c. 70), Black Moss (v.-c. 70) and Glint's Quarry (v.-c. 70) near Egremont (limestone). The quarry, once penetrated, produced a range of Barbula spp. together with some common calcicoles and Tortella inclinata*.

6 September. By permission of the Forestry Commission the party went to the upper part of Ennerdale (v.-c. 70) where one group explored a birch wood at the head of the lake whilst a second party attempted to reach the ground between Pillar and Steeple rocks. The latter party, after discovering and photographing some very well-developed tussocks of Bazzania trilobata, Campylopus introflexus and Anthelia julacea, were driven back by the swirling mists of the upper levels and retreated to the wood. The birch wood produced a good list of western species including Hylocomium umbratum, Adelanthus decipiens, Bazzania tricrenata, Nowellia curvifolia, Anastrepta orcadensis, and Scapania umbrosa. Also found were Cephalozia leucantha, Tritomaria exsecta, Calypogeia neesiana var. neesiana* and Harpanthus scutatus.

7 September. The final day was spent in Scales Wood, near Buttermere (v.-c. 70) and this enabled several members to become acquainted with species new to them. Sematophyllum novae-caesareae was locally frequent on damp boulders and other finds included Harpanthus scutatus, Hylocomium umbratum, Fissidens curnowii, Bazzania trilobata, Nowellia curvifolia and Lejeunea ulicina.

The area worked at the meeting produced few new records, a fact probably to be expected from this corner of the Lake District with its lack of base-rich rock. However, the meeting was valuable from a mapping point of view and I should like to acknowledge thanks to the organizations and owners who allowed us access to their land.

A. D. HORRILL

 

AGM and Symposium Meeting 1973

Keele, 20-21 October

The annual meeting was held on the weekend of 20-21 October in the Department of Biology at the University of Keele, by permission of Professor A. R. Gemmell. About fifty members attended and on the first day listened to six papers which are here summarized.

Dr M. E. NEWTON: 'The cytology of bryophytes'.

Because of the great variety of chromosome numbers which typify families, genera and occasionally species, cyto-taxonomic data on mosses are extensive. Most work has been done on meiotic cells since chromosome counts from spore mother cells are obtained with comparative ease, but exclusive reliance on meiosis has disadvantages in cytological comparison of entire floras. Thus, chromosome number distribution could be biased by geographical variation in the incidence of fruiting arising from a preponderance of certain families or orders in a flora, or from variation in reproductive behaviour. But mitotic studies render moss cytology independent of sexual reproduction and many cyto-taxonomic features are equally discernible during meiosis and mitosis.

The diagnostic use of chromosome numbers is to be avoided at specific level because they cannot conveniently be obtained for every moss determination and because intra-specific aneuploidy and polyploidy are common. As a guide to the taxonomist in constructing or confirming taxa, however, chromosome information can be invaluable, as shown by the genus Brachythecium on South Georgia.

Liverwort cyto-taxonomy, based on mitosis is useful only at or above family level due to the restricted range of chromosome numbers. Aneuploidy in the Porellaceae is a rare exception to this. Attempts to define karyotypes in terms of V (meta- and sub-metacentric) and J (aero- and telocentric) chromosomes are too vague for taxonomic work and a return to precise measurement of chromosomes is advocated to increase the taxonomic value of liverwort cytology. Species of Pellia give some indication of this potential at the specific level.

Mr A. EDDY:'Aspects of Sphagnum evolution'.

In the absence of fossil gametophytes suggested lines of Sphagnum evolution must be based on comparative studies on extant forms. The lines of development proposed here involve the usual assumption that modified forms are advanced and unmodified forms are primitive. The majority of physical modifications of the gametophyte are adaptations to degree of exposure, particularly with regard to water economy. Such adaptations may be accompanied by biochemical changes as the work of R. S. Clymo and others has shown. Evolutionary trends in various structural features are outlined below.

Primitive Advanced
Branch leaves monomorphic Branches dimorphic
Stem and branch leaves similar Stem and branch leaves different
Cortical leuocysts poorly differentiated or narrow.
Pores single or numerous, small, random or serial
Multi-layered cortex of inflated leucocysts. Pores confined to cell angles
Leaf apex intact Leaf apex resorbed
Chlorocysts rectangular in transverse section, widely exposed on both leaf surfaces Chlorocysts strongly displaced to one leaf surface or enclosed in leaf tissues

The nearest approach to the primitive Sphagnum among extant taxa is to be found in members of section Subsecundum (S. ovatum, S. luzonense) and the stenotypic S. sericeum. The most evolved species are in sections Sphagnum (= Inophloea), Acutifolia and Rigida. Significantly, the most primitive species seem to be palaeotropical relicts, while advanced species are abundant in fairly exposed regions at high latitudes.

Professor P. W. RICHARDS: 'Hedw. and Schp. - biographical notes on Johann Hedwig and Wilhelm Philipp Schimper'.

Hedwig (1730-1799) is probably best known for his Species Muscorum (1801) published after his death by his successor C. F. Schwaegrichen. Though this was a landmark in moss taxonomy and has been adopted as the starting point of moss nomenclature, it was not as important a contribution to bryology as his demonstration that the antheridia were the male organs of mosses (not the spore capsules as was currently believed). This discovery prepared the way for a full understanding of the life history which was completed by the work of Hofmeister some 80 years later.

Hedwig was born in a German 'colony' in Transylvania but spent most of his life in and near Leipzig, where he worked as a physician, but from 1786 also as a professor of Botany. He was handicapped at first by poverty and by lack of books and instruments, but his success depended largely on the skilful use of a compound microscope which J. G. Koehler gave him, and on his accurate drawing (self-taught at the age of forty).

W. P. Schimper (1808-1880) was the son of an Alsatian pastor. He had an uneventful life, though the war of 1870 faced him with the painful choice of accepting a chair in the new German university or moving to Paris. His most important work in bryology was the Bryologia Europaea. to which he contributed much more than his two co-authors, but he also did important geological work. He was extremely industrious and covered a vast field, but was a supremely competent observer and describer rather than an originator of new ideas.

Mr S. R. GRADSTEIN: 'A new look at the taxonomy of holostipous Lejeuneaceae (Ptychanthoideae Mizut.)'.

Some results were presented of a study of the concept of genus and generic affinities within the subfam. Ptychanthoideae Mizut., commonly known as holostipous Lejeuneaceae. This group comprises about twenty genera with probably less than 200 species, occurring mainly in the tropics in epiphytic habitats. Marchesinia mackaii is the only European representative of this group.

It appeared that six characters are of general importance for circumscribing and grouping the genera: presence or absence of innovations, structure of the perianth, stem anatomy, oil body type, morphology of the male bracts, and cell wall thickening pattern. The last two characters apparently have not been employed before in this context.

The cell wall thickening pattern provides a basis for distinguishing two groups within the subfamily. (1) Ptychanthus group having basically cordate (asymmetrical) trigones, and comprising (a) Ptychanthus, Thysananthus, Masligolejeunea and Schiffneriolejeunea with segmented oil bodies and evolved male bracts, and (b) Acrolejeunea, Brachiolejeunea and possibly Dicranolejeunea with homogene oil bodies and simple male bracts. (2) Archilejeunea group having basically triangular (symmetrical) trigones which tend to radiate along the cell walls, and comprising Lopholejeunea, Marchesinia, Symiezidium, Archilejeunea, Spruceanthus and Tuzibeanthus.

Caudilejeunea as defined at the moment has an affinity with both groups; the position of this and some other holostipous genera such as Bryopteris, Omphalanthus and Stictolejeunea needs to be reconsidered.

Dr. J. G. DUCKETT and Dr. A. S. K. PRASAD: 'Ultrastructural studies on the Nostoc colonies associated with Blasia pusilla and Anthoceros spp.'

A comparative ultrastructural study has been made of the Nostoc colonies associated with the thalli of Anthoceros laevis, A. husnotii, A. punctatus and Blasia pusilla and also of the Nostoc isolated from these bryophytes and thriving in axenic cultures. Both within thalli and in axenic culture, the Nostoc cells from all four bryophytes show the same general cytological characteristics. The vegetative Nostoc cells possess extensive photosynthetic lamellar systems. Structured granules and polyhedral bodies are also consistently present. Terminal and intercalary heterocysts together constitute approximately 5% of the algal cell populations both within the bryophyte thalli and in culture. Mucilage sheaths around the Nostoc cells are less well developed in the thalli than in culture.

In contrast to this uniformity in the Nostoc, striking differences occur between Blasia and Anthoceros in the structure of the bryophyte cells associated with the alga. These cells in Anthoceros are thin walled and highly vacuolate. Mitochondria are sparse and the plastids lack pyrenoids and well-developed thylakoid systems. Nostoc filaments frequently occupy cells in which the cytoplasm is completely disorganized. However, in Blasia this latter phenomenon has not been observed. Here, the liverwort filaments growing among the Nostoc colonies are thick walled. Their inner walls possess conspicuous ingrowths whose outline is closely followed by the cell membrane. The cytoplasm contains abundant endoplasmic reticulum and free ribosomes, numerous mitochondria and proplastids. Together, these features are characteristic of transfer cells which have not hitherto been described in association with blue-green algae. The increase in the surface area of the cell membrane brought about by the ingrowths may be an adaptation which facilitates the absorption of Nostoc metabolites and particularly fixed nitrogen (as has previously been demonstrated by tracer studies) by Blasia. Thus, these cytological observations indicate that Blasia receives some direct advantage from its blue-green algal colonies while Nostoc would appear to be the main beneficiary in its association with Anthoceros.

Dr. G. C. G. ARGENT: 'Bryophytes of Papua New Guinea'.

Papua New Guinea is the eastern part of one of the largest non-continental islands. It lies within the heavy-precipitation, humid tropical belt just north of Australia and is extremely mountainous with peaks rising to over 4270 m. (14,000 ft). The heavy rainfall, diverse terrain, generally low population density and geographical position make it one of the richest botanical hunting grounds in the world. Over 850 species of mosses have been recorded from this area and the proportion of endemism is very high, possibly about a third of the total number of species. Recent literature indicates that many new bryophyte species await description although a fair number of existing names must eventually become synonyms. The greater part of the flora shows Indo-Malayan affinities (although the montane element also shows links with New Caledonia and New Zealand) as well as some familiar cosmopolitan species such as Rhacomitrium lanuginosum and Funaria hygrometrica, and some highly disjunct occurrences such as Acrocladium sarmentosum and Scorpidium turgescens.

Descriptions were given of some lowland localities and the paucity of species in these sites, particularly the lack of ephemerals, was commented on. Visits to such rich localities as Mt Wilhelm, Mt Piora, Mt Sarawaket and Mt Shungol were described and the bryological interest of some of the head dresses of dancers in the highland shows was noted.

The Annual General Meeting was held after tea and in the evening the following exhibits were shown at a conversazione:
Dr. G. C. G. Argent: 'Some New Guinea bryophytes'.
Mr A. Eddy: 'Aspects of Sphagnum evolution'.
Mr M. V. Fletcher: 'Baked bryophytes'.
Mr S. R. Gradstein: 'Genera of holostipous Lejeuneaceae (Ptychanthoideae).
Dr. E. W. Jones: 'Gemmae in Diplasiolejeunea'.
Dr. M. C. F. Proctor: 'Further work on desiccation and temperature responses of bryophytes'.
Prof. P. W. Richards: 'Books by Hedwig and Schimper'.
Mr. A. R. Perry: 'The spread of two mosses introduced into the British Isles -
Campylopus introflexus and Orthodontium lineare'.

All the localities visited on the excursion on 21 October were in v.-c. 39. About twenty-five members led by Mr A. R. Perry went to Anglesea Coppice, known locally as Chartley Moss (G.R. 43/0228). The Moss is a very deep bog with frequent open lawns of Sphagnum. Its drier edges are wooded, but the epiphytic bryophyte flora is poor. Noteworthy finds during the morning were Acrocladium stramineum, Campylopus introflexus* (on a rotting stump), Dicranum strictum, Ephemerum serratum var. minutissimum, Plagiothecium ruthei* (on damp soil at the edge of a pond) and Calypogeia sphagnicola* (mixed with Sphagnum magellanicum). Bryum ruderale* was found on the roadside near Chartley Castle. After lunch the party visited Dimmings Dale (G.R. 43/0543) to explore a wooded, north-facing hillside with outcropping old red sandstone. Interesting bryophytes noted were: Cratoneuron filicinum var. fallax, Dicranum strictum (in large quantities on walls and tree trunks), Oligotrichum hercynicum, Schistostega pennata, Barbilophozia attenuata, Bazzania tricrenata, B. trilobata, Calypogeia neesiana var. meylanii* (sandstone rocks and shaded sandy banks), Lepidozia sylvatica*, L. trichoclados* and Odontoschisma denudatum* (all from old red sandstone rocks), Nowellia curvifolia and Ptilidium pulcherrimum* (willow trunk by a stream). On a crumbling sandstone bank near Alton Pohlia lutescens* and P. pulchella* were found growing together.

[* New vice-county record]

The Society is very grateful to Dr K. M. Goodway, Department of Biology, University of Keele, for his expert local organization, to which much of the success of the meeting was due, and to Mr Perry for leading the field excursion.

G. C. S. CLARKE

 

 
 
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