Lepisorus heterolepis (Rosenst.) Ching
Lepisorus heterolepis (Rosenst.) Ching, Bull. Fan Mem. Inst. Biol. 4: 86. 1933; Tagawa & K.Iwats., Fl. Thailand 3: 514, f. 51.1. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 273. 2000. – Polypodium lineare var. heterolepis Rosenst., Rep. Sp. Nov. 12: 247. 1913. – Pleopeltis heterolepis (Rosenst.) Tagawa & K.Iwats., Acta Phytotax. Geobot. 22: 100. 1967; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 49. 1967.
Rhizome creeping, about 2.5 mm diam., bearing fronds less than 1 cm apart, densely scaly; scales linear-subtriangular, long-attenuate at apex, toothed at margin, up to 5 by 0.7 mm, central portion with longitudinal, thick-walled cells, marginal portion with more or less clathrate cells, black in colour. Stipes up to 3 cm long, variously winged on upper part, castaneous to stramineous, scaly at base. Laminae linear, long-attenuate at both ends, up to 30 by 1.3 cm; coriaceous; veins invisible, copiously anastomosing. Sori medial, round to elliptic, only on the upper half of frond, sometimes fusing to the next ones in the upper portion. Spores monolete .
Distribution in Thailand
NORTHERN: Chiang Mai, Phitsanulok; NORTH-EASTERN: Loei.
Sikkim and SW China (Yunnan).
On mossy tree trunks in dense forests at ridge at medium to high altitudes, rather rare.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat.
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