Arthromeris lehmannii (Mett.) Ching
Arthromeris lehmannii (Mett.) Ching, Contr. Inst. Bot. Natl. Acad. Peiping 2: 96. 1933; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 60. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 567, f. 57.3–4. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 262. 2000. – Polypodium lehmannii Mett., Abhandl. Senckenb. Naturf. Ges. 2: 117, t. 3, f. 35. 1857; C.Chr., Contr. U.S. Natl. Herb. 26: 334. 1931. – Pleopeltis lehmannii (Mett.) Bedd., Ferns Brit. India: t. 260. 1868; Bedd., Handb. Ferns Brit. India: 370, f. 211. 1883.
Epiphytic or lithophytic. Rhizome long creeping, about 5 mm diam., dirty brown, densely scaly throughout; scales ovate-oblong with long tails, round at peltate base, up to 7 mm long including tails about 5 mm in length, 1.5 mm broad, nearly concolorously brown or more or less paler towards margin, minutely toothed at apical portion. Stipes stramineous or pale castaneous, 10–20 cm long, glabrous. Laminae oblong, up to 45 by 40 cm, imparipinnate; rachis like the upper part of stipes; lateral pinnae 3–9 pairs, patent or slightly ascending, straight, sessile, lanceolate, caudately acuminate at apex, cuneate to round at acroscopic and round to subtruncate at basiscopic bases, up to 20 by 3 cm, subentire at wavy and more or less crisped at margin, margin with cartilaginous membrane; terminal pinna larger, about 20 cm long, like the lateral ones; main veins 3–5 mm remote, veins anastomosing copiously, more or less visible; herbaceous, green, glabrous. Sori at junction of reticulate veins, two rows between adjacent main veins, 3 or 4 rows at each side of costa, round, up to 2 mm diam., superficial .
Distribution in Thailand
NORTHERN: Chiang Mai, Chiang Rai.
Himalayas to Upper Burma, SW China, Taiwan.
On mossy tree trunks or on mossy rocks in dense evergreen forests at high altitudes (1500–2400 m).
Arthromeris phuluangensis Tagawa & K.Iwats.
Proposed IUCN Conservation Assessment
Least Concern (LC). This species is widespread and not under any known threats.
Voucher specimens - Thailand
Middleton et al. 4885, Chiang Mai, Doi Inthanon National Park (E).
Frond upper surface
Frond lower surface
Lateral pinna and sori
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