Microlepia calvescens (Wall. ex Hook.) C.Presl
Microlepia calvescens (Wall. ex Hook.) C.Presl, Epimel. Bot.: 95. 1851 [‘1849’]; Ching, Fl. Reipubl. Popularis Sin. 2: 214, pl. 16, f. 8 & 9. 1959; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 71. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 114, f. 7.3. 1979; Boonkerd & Pollawatn, Pterid. Thailand: 39, 40 & 86. 2000. – Davallia calvescens Wall. ex Hook., Sp. Fil. 1: 172, t. 48B. 1846. – Microlepia marginalis var. calvescens (Wall. ex Hook.) Bedd., Handb. Ferns Brit. India: 64. 1883. – Microlepia marginata var. calvescens (Wall. ex Hook.) C.Chr., Index Filic.: 208. 1905; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 94. 1939.
Microlepia marginata auct. non (Houtt.) C.Chr.: Holttum, Dansk Bot. Ark 23: 233. 1965.
Rhizome long creeping, about 4 mm diam. densely covered with bright blackish-brown hairs of 2 mm or sometimes more. Stipes 2–5 cm apart, stramineous, hairs at base like those on rhizome, minutely pubescent upwards, grooved on upper surface, 50 cm or more long; lamina oblong-lanceolate, acuminate at apex, 50–70 cm long, up to 30 cm wide, pinnate to bipinnatifid; rachis grooved on upper surface, densely pubescent throughout, stramineous or darker beneath; lateral pinnae more than twelve in pairs, the upper ones gradually reducing in size to form an indistinct apical pinna, the larger ones straight, more or less ascending, linear-lanceolate, gradually narrowing towards long caudate-acuminate apex, distinctly stalked, cuneate anteriorly and very narrowly cuneate posteriorly at base, lobed about halfway or almost completely to costa; costa densely pubescent; lobes oblong, oblique, subfalcate, acute at apex, obscurely waved at margin, up to 1.3 cm long, 0.8 cm broad; papyraceous, green, glabrous above, minutely hairy beneath, veins pinnate, main veins usually zigzag. Sori terminal on veinlets, 1–1.5 mm from the margin of lobes; indusia cup-shaped, hairy .
Distribution in Thailand
NORTHERN: Chiang Mai, Chiang Rai, Lampang, Phitsanulok; NORTH-EASTERN: Phetchabun, Loei; SOUTH-WESTERN: Kanchanaburi; PENINSULAR: Phangnga.
E Himalaya, Upper Burma, China (Yunnan & Guangxi), Taiwan and Vietnam; also recorded from Java.
On rather dry but usually humus-rich slopes in tropical evergreen forest at 750–1200 m alt.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat.
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.