Microlepia herbacea Ching & C.Chr. ex Tardieu & C.Chr.
Microlepia herbacea Ching & C.Chr. ex Tardieu & C.Chr., Not. Syst. 6: 6, pl. 1, f. 1 & 2. 1937; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 97, f. 12.1 & 12.2. 1939; Ching, Fl. Reipubl. Popularis Sin. 2: 219. 1959; Holttum, Dansk Bot. Ark. 23: 233. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 72. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 115, f. 8.1. 1979; Boonkerd & Pollawatn, Pterid. Thailand: 87. 2000; Newman et al., Checkl. Vasc. Pl. Lao PDR: 26. 2007.
Microlepia trichosora Ching, Fl. Reipubl. Popularis Sin. 2: 358. 1959. – Microlepia herbacea var. trichosora (Ching) Serizawa, J. Jap. Bot. 47: 46. 1972, p.p.
Microlepia trichoclada auct. non Ching: Mitsuta, Acta Phytotax. Geobot. 36: 148. 1985.
Rhizome long creeping, densely covered with stiff blackish brown hairs, about 4 mm diam. Stipes stramineous, densely hairy at base, glabrescent or minutely pubescent above, up to 50 cm long; lamina oblong-lanceolate, gradually narrowing towards attenuately acuminate apex, round or cuneate at base, bipinnate, about 50 cm long, 30 cm wide; rachis stramineous, distinctly grooved on the upper surface, densely hirsute throughout; lateral pinnae usually more than 10 in pairs, upper ones gradually reducing in size not forming a distinct apical pinna, larger ones distinctly stalked, straight or subfalcate, ascending, pinnate, lanceolate, gradually narrowing towards caudately acuminate apex, broadly cuneate at base, up to 20 cm long, 4 cm wide; costa grooved, densely pubescent; pinnules oblong or roundly quadrangular, round or moderately acute at apex, cuneate at sessile base, lobed to 1/3 way to costules, the larger ones 2 cm long, 1.2 cm wide; ultimate lobes quadrangular round or obtuse at apex, with a few distinct teeth at margin, sinus very narrow; herbaceous, mid- to light green, glabrous except the underside of veins, or minutely or rather densely hirsute on the lamina underneath. Sori terminal on basal acroscopic veinlets, at bottom of sinus between lobes, small; indusia cup-shaped, hairy .
Distribution in Thailand
NORTHERN: Chiang Mai, Chiang Rai; NORTH-EASTERN: Phetchabun, Loei; CENTRAL: Nakhon Nayok.
Distribution in Laos
Vietnam; Ching notes that this probably grows in S. China (Guangxi and Haitian).
On rather dry slopes with humus in tropical evergreen forest at high altitudes.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat.
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