Asplenium thunbergii Kunze

Family

Aspleniaceae

Nomenclature

Asplenium thunbergii Kunze, Linnaea 10: 517. 1836; Schelpe, J. S. Afr. Bot. 29: 92. 1963; Holttum, Rev. Fl. Malaya, ed. 2, 2: 634. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 274, f. 22.4. 1985; Boonkerd & Pollawatn, Pterid. Thailand: 179. 2000.

Asplenium decorum Kunze, Bot. Zeit. 6: 176. 1848; Sledge, Bull. Brit. Mus, (Nat. Hist.) Bot. 3: 276. 1965; Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 50. 1968.

Darea belangeri Bory in Belanger, Voy. Indes Or. [Belanger] 2: 51. 1833. – Asplenium belangeri (Bory) Kunze, Bot. Zeit. 6: 176. 1848, non A. belangeri Bory, 1833: Bedd., Handb. Ferns Brit. India:161. 1883; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 243. 1940; Holttum, Rev. Fl. Malaya ed. 1, 2: 434, f. 252. 1955 [‘1954’].

Description

Epiphytic or lithophytic. Rhizome short, suberect; scales subdeltoid with acuminate apex, up to 3 by 0.8 mm, dark brown to nearly black and clathrate in central portion, pale brown, thin-walled at edges with irregular small projections at margin. Stipes up to 7 cm long, green to brownish, minutely scaly or glabrescent. Laminae bipinnate-tripinnatifid, elliptic in outline, moderately acute at apex, subtruncate at base, up to 20 by 6 cm; rachis with the wings curved upwards and continuous to lamina; lateral pinnae about 15 pairs, shortly stalked with narrowly winged stalks, elliptic, round to obtuse at apex, auricled at acroscopic base, subdimidiate at basiscopic base, up to 4 by 1.5 cm; costa winged and just like the ultimate segments which are narrowly lanceolate, oblique, up to 7 by 1.2 mm, rounded at apex, entire, basal acroscopic ones once or twice forked, one-nerved, chartaceous, glabrous. Sori along veins, occupying posterior half of ultimate segments; indusia thin but firm, persistent, reaching the margin of segments, thus apparently bilobed opening outwards.

Distribution in Thailand

PENINSULAR: Phangnga, Nakhon Si Thammarat, Yala.

Wider Distribution

Indochina and W Malesia.

Ecology

On trees or on mossy rocks in evergreen forests at medium altitudes (about 900 m).

Proposed IUCN Conservation Assessment

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

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