Bolbitis virens (Wall. ex Hook. & Grev.) Schott var. virens

Family

Dryopteridaceae

Nomenclature

Bolbitis virens (Wall. ex Hook. & Grev.) Schott, Gen. Fil.: ad t. 14. 1834; Holttum, Rev. Fl. Malaya ed. 1, 2: 468, f. 275. 1955 [‘1954’]; Tagawa & K. Iwats, SouthE. Asian Stud. 3(3): 85. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 91. 1967; Hennipman, Blumea 18: 149. 1970; Hennipman, Leiden Bot. Ser. 2: 180, f. 47 & 48. 1977; Tagawa & K.Iwats., Fl. Thailand 3: 314. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 185. 2000. – Acrostichum virens Wall. ex Hook. & Grev., Icon. Filic. II.: pl. 231. 1831. – Campium virens (Wall. ex Hook. & Grev.) C.Presl, Tent. Pterid.: 239. 1836; Copel., Philipp. J. Sci. 37: 388, f. 39. 1928.

Bolbitis costata auct. non (C.Presl) Ching: Holttum, Dansk Bot. Ark. 20: 30. 1961.

Bolbitis virens (Wall. ex Hook. & Grev.) Schott var. virens

Description

For the species :

Terrestrial or lithophytic. Rhizome short creeping, thick, densely scaly; scales thin but firm, dark brown, clathrate, up to 8 by 1.5 mm. Sterile frond: stipe 30–40 cm long, densely scaly throughout, scales on upper portion light brown, ferrugineous, appressed, irregular in shape; lamina oblong-ovate to oblong, 35–60 by about 30 cm; lateral pinnae 5–7 pairs, stalked, straight, ascending or patent in lower ones, oblong to oblong-lanceolate, caudate at apex, sometimes with bulbils on midrib near apex, narrowly cuneate or unequally rounded at base, up to 25 by 6 cm, toothed at margin, more or less waved; costa minutely scaly beneath, veins slightly raised on undersurface, reticulate with a few included veinlets in each areole; subcoriaceous, glabrous, green both in living and dried condition, terminal pinna like lateral ones or slightly larger, viviparous near apex. Fertile frond nearly as high as the sterile ones: stipe up to 55 cm long; lamina up to 40 by 20 cm; pinnae 4–6 pairs, linear, acuminate at apex, sometimes with bulbils on midrib near apex, stalked, up to 20 by 2 cm; sporangia dispersed on the whole undersurface of pinnae .

For the variety

Pinnae of fertile frond 8–12 by 0.2–0.7 cm, usually more than 15 times as long as wide.

Distribution in Thailand

NORTHERN: Chiang Mai, Lamphun, Phrae, Tak; NORTH-EASTERN: Loei; SOUTH-WESTERN: Kanchanaburi, Phetchaburi; SOUTH-EASTERN: Chanthaburi; PENINSULAR: Surat Thani.

Wider Distribution

Yunnan, Bangladesh (Chittagong), and Burma.

Ecology

On mountain slopes often near streams in dense mountain forests at 800–1200 m alt.

Proposed IUCN Conservation Assessment

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

Voucher specimens - Thailand

Middleton et al. 4697, Chanthaburi, Khao Soi Dao Wildlife Sanctuary (E); Middleton et al. 4755, Kanchanaburi, Khao Laem National Park (E); Middleton et al. 4864, Chiang Mai, Doi Suthep-Doi Pui National Park (E).

Habit

Habit

Habit

Habit

Habit

Habit

Rhizome

Rhizome

Fertile and sterile fronds

Fertile and sterile fronds

Venation in sterile frond

Venation in sterile frond

Bulbil

Bulbil

Upper surface of fertile pinna

Upper surface of fertile pinna

Lower surface of fertile pinna

Lower surface of fertile pinna

Sori

Sori

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