Volume 3 > Part 4 > Year 1989 > Page 540 > Polypodiaceae > Colysis

5. Colysis pentaphylla (Baker) Chingwfo-0001125788

Bull. Fan Mem. Inst. Biol. 3: 332. 1933; Tagawa, J. Jap. Bot. 38: 328. 1963; Tagawa & K.Iwats., S.E. Asian Stud. 5: 55. 1967.— Gymnogramma pentaphylla Baker, Kew Bull. 1898: 233. Fig. 54. 4–5.

Accepted Name : Leptochilus pentaphyllus (Baker) Liang Zhang & Li Bing Zhang
Phytotaxa 374: 174. 2018.

Synonyms & Citations :

Description : Rhizome creeping, bearing fronds sparsely, about 5 mm diam., scaly; scales oblong-subtriangular, gradually narrowing from round base towards long-acuminate apex, irregularly minutely toothed at margin, or subentire in young stage, up to 8 by about 2 mm broad, concolorously brown, clathrate. Stipes stramineous, brown at base, sparsely scaly on lower portion, up to 40 cm long, terete. Laminae imparipinnate, broadly ovate-subdeltoid to circular in outline, 15–35 by 20–35 cm; lateral pinnae up to 5 pairs, nearly equal in size, or the upper one or two slightly reduced, narrowly lanceolate to oblong-lanceolate, broadest at middle portion, caudately acuminate at apex, narrowly cuneate towards base, about 20 by 3 cm broad, the base decurrent to form very narrow wing of rachis; veins more or less obscure, forming two rows of areoles between adjacent main veins; herbaceous. Sori linear; continuous along a line between two rows of areoles, sometimes lacking on ¼ part near margin.

Thailand : NORTHERN: Chiang Mai (Doi Pha Hom Pok, Doi Chaing Dao, Doi Khun Huai Pong, Doi Suthep, Doi Inthanon), Phitsanulok (Thung Salaeng Luang, Phu Miang); NOTH-EASTERN: Loei (Phu Luang, Phu Kradueng); SOUTH-WESTERN: Kanchanaburi (Khao Ri Yai).

Distribution : SW China (Yunnan – type) and Laos.

Ecology : On mountain-slopes usually in dense forests at high altitudes, rather rare.

Notes: The Phu Luang plants are typical of this species and the others resemble the following in some respects. This species is sometimes confused with the next, but distinguishable from it by a few pinnae (less than 5 pairs) which are usually oblanceolate, narrowing towards base, forming the outline of laminae ovate, the stipes much longer than laminae, and light green leaves, not easily becoming blackish in dried condition.

E-version notes : For more details see Ferns of Thailand, Laos and Cambodia.