Dryopteris pseudosparsa Ching

Family

Dryopteridaceae

Nomenclature

Dryopteris pseudosparsa Ching, Bull. Fan Mem. Inst. Biol. 8: 489. 1938; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 96. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 356, f. 32.3–32.5. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 204. 2000.

Description

Rhizome short, ascending or suberect; scales castaneous, thin but coarse, up to 12 by 1.5 mm. Stipes castaneous and densely scaly at base, stramineous and sparsely scaly upwards, about 30 cm long. Laminae subtriangular, acuminate at apex, tripinnatifid at base, about 30 by 20 cm; rachis bearing dense, linear, small, dark brown scales; lateral pinnae about 5 pairs, similar to each other in shape and size, narrowly subtriangular, gradually narrowing towards acuminate apex, broadly truncate at distinctly stalked base, up to 15 by 7 cm; upper pinnae rather suddenly becoming smaller, forming indistinct apical part of frond; pinna-rachis with small linear scales and brown partially bullate ones, grooved above; basal pinnules larger, narrowly subtriangular, up to 6 by 2 cm, pinnate, posterior pinnules oblong-subdeltoid, serrate or lobed at margin; segments of larger pinnules like smaller pinnules; chartaceous, deep green. Sori dorsal on veinlets, subcostular or medial; indusia fugacious, persistent , brown, up to 1 mm diam.

Distribution in Thailand

NORTHERN: Chiang Mai.

Wider Distribution

S China (Yunnan and Guizhou).

Ecology

On moist mountain slopes in dense mixed forests at about 1000 m alt.

Proposed IUCN Conservation Assessment

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

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