Selliguea griffithiana (Hook.) Fraser-Jenk.

Family

Polypodiaceae

Nomenclature

Selliguea griffithiana (Hook.) Fraser-Jenk., Taxon. Revis. Indian Subcontinental Pteridophytes : 47. 2008. – Polypodium griffithianum Hook., Ic, pl.: t. 951. 1854. – Pleopeltis griffithiana (Hook.) T.Moore, Index Fil.: lxicviii. 1857; Bedd., Handb. Ferns Brit. India: 354, f. 199. 1883. – Phymatodes griffithiana (Hook.) Ching, Contr. Inst. Bot. Natl. Acad. Peiping 2: 71. 1933; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 472. 1941. – Crypsinus griffithianus (Hook.) Copel., Gen. Fil.: 206. 1947; Tagawa, J. Jap. Bot. 38: 330. 1963; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 59. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 554. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 247, 248, 267. 2000; Newman et al., Checkl. Vasc. Pl. Lao PDR: 29. 2007. – Type: Simons 290, India, Assam; Khasia (K; image online K000575662 ).

Description

Rhizome long creeping, about 2 mm diam., densely covered with scales throughout; scales linear, moderately acute at base, gradually narrowing from the broadest peltate portion to long-tailed apex, about 6 by 1.2 mm, brown or paler, membranous, entire. Stipes (2–)5–12 cm long, stramineous, scaly at base, scales similar to those on rhizome, very sparsely scaly upwards with linear hair-like scales. Laminae simple, narrowly oblong with gradually narrowing apical portion, cuneate to rounded at base, rather suddenly narrowing at caudately acuminate apex, (9–)15–25 by (2–)3.5–5.5 cm, entire or irregularly wavy at margin; midrib distinctly raised beneath, like the upper part of stipes; main lateral veins forming angles of 55–75° to midrib, straight or forming a zigzag curve, becoming obscure near the margin; the other veins hardly visible, forming irregular anastomosis with included free veinlets; papyraceous or stiff, green, glabrous. Sori one between adjacent main veins, thus in a single row, close to midrib, round , rather large, up to 4 mm diam.

Distribution in Thailand

NORTHERN: Chiang Mai.

Distribution in Laos

Luang Phrabang.

Wider Distribution

India, Upper Burma, SW China and Vietnam.

Ecology

On mossy tree trunks or on mossy limestone cliffs in dense evergreen forests, restricted to the highest parts of the higher mountains in the North, not so common.

Proposed IUCN Conservation Assessment

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

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