Bolbitis virens (Wall. ex Hook. & Grev.) var. compacta Hennipman

Family

Dryopteridaceae

Nomenclature

Bolbitis virens (Wall. ex Hook. & Grev.) var. compacta Hennipman, Blumea 18: 149. 1970; Hennipman, Leiden Bot. Ser. 2: 184, f. 47 & 48i–j. 1977; Hennipman, Fl. Males., Ser. II, Pterid. 1: 321, f. 25a–c. 1978; Tagawa & K.Iwats., Fl. Thailand 3: 316. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 185. 2000.

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, 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, with a bulbil near the 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, stalked, up to 20 by 2 cm; sporangia dispersed on the whole undersurface of pinnae .

For the variety :

Different from the type variety in: pinnae of fertile frond broader, 4–9 by 0.8–2 cm, about 3–7 times as long as wide.

Distribution in Thailand

SOUTH-EASTERN: Chanthaburi; PENINSULAR: Phangnga, Trang.

Wider Distribution

Peninsular Malaysia, S Vietnam.

Ecology

Moist ground by streams in dense evergreen forests at low altitude less than 300 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. 4660, Chanthaburi, Namtok Phlio National Park (E).

Habit (Bolbitis virens var. compacta is the taller plant)

Habit (Bolbitis virens var. compacta is the taller plant)

Sterile and fertile fronds

Sterile and fertile fronds

Upper surface of sterile pinna

Upper surface of sterile pinna

Fertile frond

Fertile frond

Upper surface of fertile pinna

Upper surface of fertile pinna

Fertile pinna

Fertile pinna

Sori

Sori

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