Bolbitis deltigera (Bedd.) C.Chr.

Family

Dryopteridaceae

Nomenclature

Bolbitis deltigera (Bedd.) C.Chr., Index Filic. Suppl. III.: 48. 1934; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 91. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 313, f. 26.6–8. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 183. 2000. – Poecilopteris costata var. deltigera Bedd., Ferns, Brit. India: 114, pl. 114. 1865. – Meniscium deltigerum Wall. ex C.B.Clarke, Trans. Linn. Soc. London, Bot. 1: 572. 1880. – Campium deltigerum (Bedd.) Copel., Philipp. J. Sci. 37: 387, f. 38. 1928. – Bolbitis virens var. deltigera (Bedd.) Hennipman, Blumea 18: 149. 1970; Hennipman, Leiden Bot. Ser. 2: 184, f. 47 & 48k–m. 1977.

Description

Lithophytic or terrestrial. Rhizome short to long creeping, more than 1 cm diam., densely scaly; scales oblong-subdeltoid, up to 5 by 1.2 mm, brown, clathrate in centre, sometimes with a paler and non clathrate at margin, stiff. Sterile frond: stipe stramineous, 30–50 cm long, scaly throughout with light brown, ferrugineous, appressed scales; lamina oblong-lanceolate, 40–60 by 30–40 cm; lateral pinnae 6–9 pairs, shortly stalked, 5–8 cm apart, oblong-lanceolate, rather suddenly narrowing to cuspidate apex, round to cuneate at base, subentire or more or less waved at margin, up to 23 by 5 cm, often a bulbil present near end of costa and sometimes near ends of main lateral veins on upper surface; terminal pinna like lateral ones, a little longer to 27 x 7.5 cm, bulbils present near apex and sometimes near ends of main lateral veins on upper surface; costa minutely scaly beneath; veins slightly raised beneath; subcoriaceous, green even in dried condition. Fertile frond lower than the sterile ones: stipe 30–50 cm long; lamina 35–45 by 12–15 cm; lateral pinnae 6–8 pairs, distinctly stalked, straight, ascending, oblong, acuminate at apex, unequally rounded to cuneate at base, 11 by 2.5 cm; terminal pinna like the lateral ones, sometimes viviparous near apex; sporangia covering the undersurface of pinnae except for narrow sterile strands along main veins.

Distribution in Thailand

NORTHERN: Lampang, Phrae, Phitsanulok; SOUTH-WESTERN: Phetchaburi; CENTRAL: Nakhon Nayok; SOUTH-EASTERN: Chachoengsao.

Wider Distribution

N India.

Ecology

On moist rocks or on humus-rich ground in dense forests, seasonally dry, below 600 m alt.

Proposed IUCN Conservation Assessment

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

Notes

This species has sometimes been treated as a synonym of Bolbitis virens (Wall. ex Hook. & Grev.) Schott .

Voucher specimens - Thailand

Middleton et al. 4732, Chachoengsao, Ang Rue Nai Wildlife Sanctuary (E).

Habit

Habit

Young frond

Young frond

Venation

Venation

Fertile frond

Fertile frond

Immature fertile pinna

Immature fertile pinna

Immature sori

Immature sori

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