Family

Polypodiaceae

Nomenclature

Arthromeris tatsienensis (Franch. & Bureau ex Christ) Ching, Contr. Inst. Bot. Natl. Acad. Peiping 2: 93. 1933; Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 111, f. 6. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 564. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 263. 2000. – Polypodium tatsienense Franch. & Bureau ex Christ, Bull. Soc. Bot. France 52. Mém. 1: 19. 1905.

Description

Terrestrial. Rhizome long creeping, 4–7 mm diam., densely scaly throughout; scales narrowly subulate with long tails, up to 6 by 1.2 mm, irregularly toothed at margin, brown, indistinctly clathrate. Stipes 20–30 cm long, castaneous, densely scaly at base, glabrous upwards. Laminae imparipinnate, oblong, 20–33 by up to 23 cm; rachis castaneous, glabrous; lateral pinnae subopposite, 2–7 pairs, ascending, straight, sessile, oblong-lanceolate, caudately acute at apex, broadly cuneate to round or rarely subcordate at base, 8–15 by 1.5–3 cm, the edges subentire or undulate, margined with narrow cartilaginous membranes; terminal pinna larger, up to 16 by 3 cm, usually narrowing from base to apex; main veins 4–6 mm remote, veins anastomosing copiously with many included veinlets; subcoriaceous, green, glabrous. Sori at junction of reticulate veins, large, round or elliptic, 3–5 mm diam., usually in a single row at each side of costa, medial or a little closer to costa, sometimes two irregular rows, superficial .

Distribution in Thailand

NORTHERN: Chiang Mai, Lamphun.

Wider Distribution

SW China.

Ecology

Terrestrial on rather dry slopes along path in mixed forests at about 600–1400 m alt.

Proposed IUCN Conservation Assessment

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

Voucher specimens - Thailand

Middleton et al. 5012, Chiang Mai, Doi Chiang Dao Wildlife Sanctuary (E).