e-Flora of Thailand
Volume 3 > Part 2 > Year 1989 > Page 281 > Aspleniaceae > Asplenium
23. Asplenium siamense Tagawa & K.Iwats.wfo-0000159274
Acta Phytotax. Geobot. 25: 17. 1971.
Accepted Name : This is currently accepted.
Synonyms & Citations :
Description : Rhizome short, ascending or suberect, bearing several living fronds and numerous stipes without pinnae, and appearing brush-like, densely scaly; scales gradually narrowing from base towards acuminate apex, about 2.5 by up to 0.4 mm, nearly black with brown edges which becoming fimbriate or soft hairy in age. Stipe very dark purple to nearly black, polished, glabrous but scaly at base, up to 4 cm long or in smaller fronds less than 1 cm. Lamina simply pinnate except for the decompound apical portion, 3–8 cm long, lower half of lamina pinnate, 6–10 mm wide, nearly parallel at edges; pinnae sessile, 2–5 mm apart, rounded at apex, a little ascending and nearly straight at basiscopic side, subtruncate at inner side, and shallowly lobed at acroscopic edge, 3–7 by 2–3 mm, fallen ones leaving minute scars on rachis; lobes rounded, with round sinus; veins hardly visible, a few times forked, not reaching the margin of lobes; rachis bearing branches at middle or above, sometimes the axes forked a few times, each branch taking appearance of pinnate frond; the apical pinnae adnate at base ending in indistinct apical pinnae. Sori one to three in each lobe, 1–1.5 mm long; indusia covered under sporangia at maturity.
Thailand : NORTH-EASTERN: Loei (Phu Kradueng – type).
Distribution : Endemic.
Ecology : Sandstone rock at about 1,300 m alt., known only by the type collection: Sorensen et al. 2279, 7905 -C K.
E-version notes : For more details see Ferns of Thailand, Laos and Cambodia.