Arthromeris tatsienensis (Franch. & Bureau ex Christ) Ching

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 costamedial 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).

Habitat

Habitat

Habit

Habit

Rhizome

Rhizome

Rhizome scales

Rhizome scales

Frond

Frond

Frond

Frond

Upper pinna surface

Upper pinna surface

Sori

Sori

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 16 November 2016.