Davallia assamica (Beddome, 1865) Baker, 1868
Description
Rhizome without the scales 3-5.3 mm in diametre, not white waxy (D. assamica Rhizome). Scales whitish or red-brown, without pale border, narrowed evenly towards the apex, not or seldom curling backward, not bearing multiseptate hairs, toothed, peltate, 8-10 mm long by 1.8-2.5 mm broad (D. assamica Scales). Stipes adaxially grooved, 4-7 cm long, glabrous or with few scales. Lamina narrowly ovate (D. assamica Habitus), pinnate with pinnatilobed to pinnatifid pinnae towards base and in the middle part, or sometimes bipinnate, elongate, glabrous, 10-27 cm long by 3.5-12 cm broad, not or slightly dimorphous. Longest petiolules 1 mm long. Pinnae narrowly ovate. Longest pinnae 3.5-6 cm long by 1-2 cm broad. Pinnalobes of at least the larger pinnae anadromous, linear oblong, longest 7-15 mm long by 3-4 mm broad. Upper ridge at the junction of the costa and pinna-rachis not swollen. Leaf axes glabrous. Margins of the lamina of each leaflet thickened and decurrent on the edge of the grooved rachis (in fertile leaves). Veins in sterile ultimate lobes pinnate, not reaching the margin. False veins not present. Sori separate, borne several or frequently single on a segment, at the forking point of veins. Indusium attached at the broad base and hardly or not at the sides, semicircular, wider than long or about as wide as long, 0.7-1 mm long by 0.8-1.2 mm broad, upper margin not elongated, truncate or slightly rounded, separated from or even with lamina margin (D. assamica Indusia). Lamina generally extending into a tooth at both sides or only at the outside of a sorus.
Distribution
Continental Asia: India (Manipur 6 coll., Naga Hills 1 coll.); Bhutan (3 coll.); Northern Burma (Sumpra Bum 1 coll.); China (Southern Tibet 5 coll., Yunnan 14 coll.).
Ecology
Altitude 900-2100 m.