Davallia clarkei Baker, 1874
Description
Rhizome without the scales 5 mm in diametre, not white waxy (D. clarkei Rhizome). Scales brown, without pale border, narrowed evenly towards the apex, not bearing multiseptate hairs, lacking marginal setae or teeth, or those rare, or toothed, basifixed with cordate base and much overlapping lobes, 7-10 mm long. Stipes pale, adaxially grooved, 7-35 cm long, glabrous or with few scales. Lamina compound (D. clarkei Habitus), tripinnate, or quadripinnate, deltoid and broadest towards base, glabrous, 10-50 cm long by 6-50 cm broad, not or slightly dimorphous. The pinnae generally with the lowest pinnule at very base of pinna-rachis, but sometimes with a petiolule of up to 1 mm long. Pinnae deltoid or linear-triangular. Longest pinnae 2-30 cm long by 1.2-18 cm broad. Both lowest pinnules of at least basal pinnae inserted on pinna base, other pinnules anadromous (sometimes only one pinnule), deltoid or narrowly ovate. Longest pinnules 6-130 mm long by 2-50 mm broad. Ultimate leaflets linear oblong, lobed almost to the midrib. Ultimate segments or lobes obtuse or acute without a tooth, 1-4 mm long by 0.2-1 mm broad. Leaf axes glabrous. Veins in sterile ultimate lobes frequently simple, not reaching the margin. False veins not present. Sori separate, frequently single on a segment, at the forking point of veins. Indusium reniform or semicircular, attached at the narrow, cordate base only, or attached at the broad base and hardly or not at the sides, wider than long or about as wide as long, 0.3-1.2 mm long by 0.4-1.5 mm broad (D. clarkei SEM1, picture of indusia).
Distribution
Continental Asia: Northwestern India (2 coll.); Bhutan (4 coll.); Nepal (6 coll.); Burma (1 coll.); Northern Thailand (Doi Inthanon and Chieng Rai 6 coll.); China (Chekiang 4 coll., Kiangsi 2 coll., Sichuan c. 14 coll., Kweichow 7 coll., Fukien 4 coll., Hongkong many coll., Taiwan many coll., Yunnan many coll., Tibet c. 20 coll.).
Ecology
Epiphytic or epilithic in evergreen forest, sometimes in open places. Altitude 1200-4000 m.