Prosaptia contigua (G.Forst.) C.Presl

Family

Polypodiaceae

Nomenclature

Prosaptia contigua (G.Forst.) C.Presl, Tent. Pterid.: 166. 1936; Bedd., Handb. Ferns Brit. India: 56, f. 28. 1883; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 63. 1967; Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 53. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 593. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 293. 2000; Parris, Fl. Pen. Malaysia, Ser. I, Ferns & Lycoph. 1: 176. 2010. – Trichomanes contiguum G.Forst., Prodr.: 84 1786. – Ctenopteris contigua (G.Forst.) Holttum, Rev. Fl. Malaya ed. 1, 2: 230, f. 130. 1955 [‘1954’].

Description

Rhizome short creeping, bearing closely spaced fronds, densely scaly, scales subtriangular, attenuate at apex, about 3 by 1.7 mm, thin, more or less clathrate, hairy at margin with dark brown, short setose hairs. Stipes short, to 3.8 cm long, dark brown, rather densely setose hairy. Laminae linear-lanceolate ot oblanceolate, gradually narrowing towards both ends, 11–30(–66) by 2–2.5(–6.7) cm, deeply lobed nearly to midrib with a wing less 0.1–0.7 mm in breadth on each side; middle largest lobes slightly ascending, narrowly subtriangular, straight or slightly falcate, entire, 9–1.5(–3.7) cm by 2–5 mm; thinly leathery, veins simple, sparsely hairy at margin. Sori in cup-shaped cavities at margin of apical portion of lobes, opening towards margin , about 1 mm diam.

Distribution in Thailand

PENINSULAR: Chumphon, Surat Thani, Nakhon Si Thammarat, Yala.

Wider Distribution

S India, Sri Lanka, Thailand, S China, Taiwan, throughout Malesia, NE Australia, Pacific Islands.

Ecology

On mossy tree trunks in dense evergreen forests at high altitudes, rather rare.  Sometimes lithophytic .

Proposed IUCN Conservation Assessment

Least Concern (LC). This species is widespread and not under any known threat.

Notes

Except in the difference in soral character , this and Prosaptia obliquata (Blume) Mett. are quite similar. Prosaptia contigua is abundant on Khao Luang growing in mixed populations with Prosaptia obliquata .

Voucher specimens - Thailand

Hennipman 3853, Nakhon Si Thammarat, Khao Luang (P); Smitinand 1279, Nakhon Si Thammarat, Khao Luang (P).

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