Dryopteris porosa Ching
Dryopteris porosa Ching, Bull. Fan Mem. Inst. Biol. 8: 460. 1938; Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 114, f. 10. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 350, f. 32.1 & 32.2. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 204. 2000.
Rhizome short, massive. Stipes stramineous, up to 1 cm at base, about 50 cm long, densely scaly at base, sparsely clad with small scales or glabrescent upwards, grooved above; scales thin but firm, about 25 by 5 mm, brown, entire. Laminae oblong-subdeltoid, acute at apex, 60 by 50 cm, tripinnate; rachis very sparsely and minutely scaly, grooved above; pinnae about 10 pairs, patent or ascending, basal pinna the largest, oblong-subtriangular, up to 40 by 1.5 cm; pinna-rachis narrowly winged in slender portion, grooves decurrent into those of rachis; segments oblong, oblique, 15 by 5 mm, rounded and serrate, cuneate and sessile or adnate at base, lobed to halfway, lobes round-subtriangular, acuminate or acute at apex, up to 3 mm long and wide; chartaceous, light green on upper surface, midrib and veins impressed above, distinct beneath, veins ending in large globose hydathodes within the margin of lobes; paler beneath, lower midrib surface with numerous large stomata, margin cartilaginous. Sori dorsal on veinlets, large, costular or medial; indusia large, round-reniform, about 1.7 mm diam., persistent .
Distribution in Thailand
China (Guizhou and Sichuan).
On humus-rich floor of dense evergreen forests at about 1600 m alt.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threat.
Only once collected: Tagawa et al. T-1 1593 (KYO).
Site hosted by the Royal Botanic Garden Edinburgh. Content managed by Stuart Lindsay, Gardens by the Bay, Singapore and David Middleton, Singapore Botanic Gardens. Last updated 24 January 2012