Pyrrosia flocculosa (D.Don) Ching

Family

Polypodiaceae

Nomenclature

Pyrrosia flocculosa (D.Don) Ching, Bull. Chin. Bot. Soc. 1:66. 1935; Tardieu & C.Chr., Fl. Indo-Chine .7(2): 512. 1941; Tagawa & K.Iwats., Acta Phytotax. Geobot. 24: 61. 1969; Hovenkamp, Leiden Bot. Ser. 9: 179, f. 19. 1986; Tagawa & K.Iwats., Fl. Thailand 3: 503. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 285. 2000. – Polypodium flocculosum D.Don, Prodr. Fl. Nepal.: 1. 1825. – Niphobolus flocculosus (D.Don) Spreng., Syst. 4:45. 1827; Bedd., Handb. Ferns Brit. India: 331, f. 180. 1883.

Description

Rhizome short creeping bearing closely spaced fronds, densely scaly; scales basally attached, cordate at base, linear-subtriangular, gradually narrowing towards apex, entire, usually up to 8 by 0.9 mm, concolorous golden brown or more or less bi-coloured with brown central portion and pale brown margin. Fronds simple. Stipes up to 7 cm long, very narrowly winged, covered with pale stellate hairs. Laminae subquadrangular to broadly spathulate, acute to rotundate at apex, rather suddenly broadly cuneate at base, up to 20 by 6.5 cm; midrib raised beneath, main veins more or less visible, other veins invisible, copiously anastomosing; thick, upper surface deep green, very sparsely hairy with pale stellate hairs, with hydathodes, lower surface densely covered with short-armed stellate hairs. Sori round, small, more or less distinct, about 1 mm diam., covering the under surface of fronds from the upper portion downwards, remaining narrow marginal sterile portion.

Distribution in Thailand

NORTHERN: Chiang Mai, Nan, Tak.

Wider Distribution

Himalayas, Burma and Vietnam.

Ecology

Epiphytic in evergreen forests along stream, about 750 m alt.

Proposed IUCN Conservation Assessment

Least Concern (LC). This species is widespread and not under any known threat.

Voucher specimens - Thailand

Middleton et al. 4954, Chiang Mai, Doi Pha Ti Do (E); Srisanga 2557, Nan (E, QBG); Middleton & Triboun 4828, Tak, Road west to Mae Ramad (E).

Habit

Habit

Whole plant from above

Whole plant from above

Whole plant from below

Whole plant from below

Rhizome and scales

Rhizome and scales

Lower surface of frond with sori

Lower surface of frond with sori

Frond apex

Frond apex

Young sori

Young sori

Old sori

Old sori

Site hosted by the Royal Botanic Garden Edinburgh. Content managed by Stuart Lindsay, Gardens by the Bay, Singapore and David Middleton, Singapore Botanic Gardens. Last updated 16 November 2016.