Christiopteris tricuspis (Hook.) Christ

Family

Polypodiaceae

Nomenclature

Christiopteris tricuspis (Hook.) Christ, J. Bot. France 21: 273. 1908; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 450, f. 52.2. 1941; Holttum, Rev. Fl. Malaya ed. 1, 2: 211. 1955 [‘1954’]; Tagawa & K.Iwats., Acta Phytotax. Geobot. 24: 60. 1969; Tagawa & K.Iwats., Fl. Thailand 3: 553, f. 56.1–2. 1989; Hennipman et al., Fl. Males., Ser. II, Ferns and Fern Allies 3: 36. 1998; Boonkerd & Pollawatn, Pterid. Thailand: 264. 2000. – Acrostichum tricuspe Hook., Sp. Fil. 5: 272, t. 304. 1864. – Gymnopteris tricuspis (Hook.) Bedd., Ferns Brit. India: t. 53. 1866; Bedd., Handb. Ferns Brit. India: 434, f. 263. 1883. – Selliguea tricuspis (Hook.) Fraser-Jenk., Taxon. Revis. Indian Subcontinental Pteridophytes : 45. 2008. – Type: Atkinson s.n. (K).

Christiopteris eberhardtii Christ, J. Bot. (Morot) Ser.2, 1: 272. 1908; Holttum, Rev. Fl. Malaya ed. 1, 2: 211. 1955 [‘1954’].

Description

Rhizome long creeping, 2–4 mm diam., densely covered with scales; scales pseudopeltate, red-brown, peltate, up to 0.7 mm broad at basal portion and gradually or sometimes abruptly narrowing upwards as long tails like bristles, up to 10 mm long, sometimes clathrate to some extent with thick intermediate cell-walls or not, very sparsely short hairy at margin. Stipes pale to stramineous, glabrous except for the scaly base, (20–)30–63 cm long in those of sterile fronds, longer in fertile ones. Sterile lamina deeply trilobed (5-lobed in Malaysian and Vietnamese plants), up to 30(–75) cm both in length and width, round or slightly cordate at base, main lobes oblong with caudate apex, larger than the lateral ones, up to 30 by 7 cm; lateral lobes oblong to oblong-lanceolate, curved upwards; the edges of laminae thickened, entire or crisped; coriaceous, green on both surfaces but paler underneath; venation drynarioid, copiously reticulate with simple or branched included veinlets, not easily visible. Fertile fronds taller, lobes linear, up to 1.5 cm broad, longer than the sterile lobes, lower surface covered entirely with sporangia mixed with short, simple paraphyses .

Distribution in Thailand

CENTRAL: Nakhon Nayok.

Wider Distribution

India, China (Hainan), Vietnam and Peninsular Malaysia.

Ecology

Epiphytic in evergreen forests along streams.

Proposed IUCN Conservation Assessment

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

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