Davallia parvula Wallich ex Hooker and Greville, 1829
Description
Rhizome without the scales 0.5-1.2 mm in diametre, white waxy under the scales (D. parvula Rhizome). Scales red-brown without pale border, narrowed evenly towards the apex, not or seldom curling backward, not bearing multiseptate hairs, with marginal setae at least in distal part, peltate, 2.5-6 mm long by 0.3-0.6 mm broad. Stipes dark brown, adaxially grooved, 0.1-5 cm long, glabrous or with few scales. Lamina compound (D. parvula Habitus1), entirely divided into fine linear segments without obvious rachis, deltoid and broadest towards base, glabrous, 0.6-4 cm long by 0.5-3.5 cm broad, not or slightly dimorphous. Longest petiolules 1-2 mm long. Pinnules of at least the larger pinnae anadromous. Ultimate segments or lobes obtuse or acute without a tooth, 0.5-4 mm long by 0.2-0.4 mm broad. Ultimate segments of sterile compound leaves 0.2-0.4 mm broad. Upper ridge at the junction of the costa and pinna-rachis not swollen. Leaf axes glabrous. Veins in sterile ultimate lobes frequently simple, reaching the margin. False veins not present. Sori separate, 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 or more or less triangular to rhomboid, about as wide as long, 0.3-0.8 mm long and broad, upper margin not elongated, truncate or slightly rounded, separated from or even with lamina margin (D. parvula SEM, picture of indusia). Lamina generally extending into a tooth at both sides of a sorus.
Distribution
Malesia: Sumatra (E. Coast 1 coll., Bangka 3 coll., Lingga Arch. 1 coll.); Singapore (2 coll.); Borneo (Sarawak 8 coll.; Brunei 1 coll.; Sabah, Sandakan 3 coll.; Kalimantan Barat 1 coll.; Kalimantan Tengah, Sampit 1 coll.; Kalimantan Timur 3 coll.); Papua New Guinea (many coll., including Fergusson, Manus, Misima, and Normaby Islands 1 coll. each).
Pacific: Solomon Islands (Guadalcanal 1 coll.)
Ecology
Epiphytic or epilithic. Altitude 0-800 m.
Note
Davallia parvula is closely related to Davallia repens . It is not easy to separate them; probably there are hybrids between some more dissected forms of D. repens and D. parvula .