Athyrium mackinnonii (C.Hope) C.Chr.

Family

Athyriaceae

Nomenclature

Athyrium mackinnonii (C.Hope) C.Chr., Index Filic.: 143. 1905; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 277. 1940; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 102. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 446, f. 48.2. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 189. 2000. – Asplenium mackinnonii C.Hope, J. Bot. 1896: 124.

Description

Terrestrial. Rhizome erect, with a few fronds at apex, scaly; scales narrow with long-tailed apex, up to 6 by 0.8 mm, dark brown, entire. Stipes up to 20 cm long, stramineous, dark brown and scaly at base. Laminae broadly oblong, acute at apex, up to 30 by 20 cm, bipinnate-tripinnatifid; pinnae about 10 pairs, lower pinnae stalked, ascending, oblong-lanceolate, up to 11 by 5 cm, the upper pinnae becoming smaller upwards; pinnules subsessile or shortly stalked, oblong, oblique, moderately acute to rounded at apex, truncate to auricled at anterior and cuneate at posterior bases, about 2.5 by 1 cm; ultimate segments oblong, rounded at apex, distinctly toothed; papyraceous to subcoriaceous; veins pinnate, veinlets simple or rarely forked, ending in teeth at margin of segments. Sori oblong, usually close to costules; indusia opening anteriorly, oblong, crenate at margin .

Distribution in Thailand

NORTHERN: Chiang Mai, Phitsanulok; NORTH-EASTERN: Loei; SOUTH-EASTERN: Chanthaburi.

Wider Distribution

India, SW China and Indochina.

Ecology

On rather dry mountain slopes in dense evergreen forests at 1100–l300 m alt.

Proposed IUCN Conservation Assessment

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

Voucher specimens - Thailand

Middleton et al. 4497, Chiang Mai, Doi Inthanon National Park (E).

Habit

Habit

Lower surface of lamina and sori

Lower surface of lamina and sori

Sori

Sori

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