Polystichum pseudotsus-simense Ching

Family

Dryopteridaceae

Nomenclature

Polystichum pseudotsus-simense Ching, Bull. Fan Mem. Inst. Biol. 2: 190. 1931; Boonkerd & Pollwatn, Nat. Hist. J. Chulalongkorn Univ. 6: 22. 2006.

Description

Rhizome short, erect. Stipes green to stramineous, 15–20 cm long; scales at base, brown or black, 1–1.5 x 1–1.5 cm, broadly lanceolate, apex acuminate, margin entire, scales higher on stipe smaller and patent. Laminae coriaceous, broadly oblong, apex caudate, bipinnate at base, pinnatifid towards apex; pinnae c. 10–14 pairs, 3–4 cm apart, subsessile, to 15 cm long, 2.5 cm wide; ultimate segments subrhomboid to oblong, c. 1.5 x 0.5 cm, unequal at base, somewhat serrulate at margin, aristate; veins free, pinnately forked. Sori submarginal, large, c. 6 on each side of costule; indusium entire .

Distribution in Thailand

SOUTH-WESTERN: Kanchanaburi.

Wider Distribution

Burma, India.

Proposed IUCN Conservation Assessment

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

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