Microsorum superficiale (Blume) Ching

Family

Polypodiaceae

Nomenclature

Microsorum superficiale (Blume) Ching, Bull. Fan Mem. Inst. Biol. 4: 299. 1933; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 480. 1941; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 52. 1967; Holttum, Rev. Fl. Malaya, ed. 2, 2: 632. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 525, f. 53.1. 1989; Nooteboom, Blumea 42: 365. 1997; Bosman et al., Fl. Males., Ser. II, Ferns and Fern Allies 3: 129. 1998; Boonkerd & Pollawatn, Pterid. Thailand: 281. 2000. – Polypodium superficiale Blume, Fl. Javae Fil.: 136, t. 56, f. 1.1828. – Pleopeltis superficialis (Blume) Bedd., Handb. Ferns Brit. India: 350. 1883. – Lepidomicrosorium superficiale (Blume) Li Wang, Bot. J. Linn. Soc. 162(1): 36. 2010. – Neocheiropteris superficialis (Blume) Bosman, Leiden Bot. Ser. 14: 121. 1991. – Tricholepidium superficiale (Blume) Fraser-Jenk., Taxon. Revis. Indian Subcontinental Pteridophytes : 69. 2008. – Type: Blume s.n. (L), Java.

Description

Rhizome very long creeping, scandent on tree, 1–5 mm diam., usually scaly throughout, sometimes naked in older sections; scales narrowly oblong-subtriangular, gradually narrowing towards apex, irregularly round at base, entire, 1–6.5 by 0.5–2.5 mm, brown, consisting of smaller cells with distinct internal walls. Stipes 10–20 cm long, winged only on the upper portion, scaly at base, green, stramineous or dark in basal portion. Laminae lanceolate, broadest at middle, gradually narrowing towards both ends, acuminate at apex, attenuate at base, entire and flat at margin, (3–)20–40(–60) by (0.5–)3–5(–6) cm; midrib distinctly raised beneath, veins more or less visible, copiously anastomosing; thin chartaceous. Sori round, punctate, at junction of veinlets, scattered on the whole of the under surface of laminae , up to 2 mm diam.

Distribution in Thailand

NORTHERN: Chiang Mai, Phitsanulok; NORTH-EASTERN: Loei.

Wider Distribution

Himalayas and throughout Malesia.

Ecology

On mossy tree trunks in dense evergreen forests at high altitudes, locally abundant.

Similar species

Neocheiropteris normalis (D.Don) Tagawa

Proposed IUCN Conservation Assessment

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

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