Diplazium conterminum Christ

Family

Athyriaceae

Nomenclature

Diplazium conterminum Christ, J. Bot. 19: 67. 1905; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 258. 1940; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 105. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 462. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 191. 2000. – Allantodia contermina (Christ) Ching, Acta Phytotax. Sin. 9: 47. 1964. – Diplazium virescens var. conterminum (Christ) Sa.Kurata, J. Geobot. 7: 77. 1958.

Description

Rhizome creeping; scales dark brown, up to 15 by 1 mm, toothed. Stipes about 50 cm long. Frond subdeltoid, about 50 by 50 cm, bipinnate; lower pinnae with stalks up to 5 cm long, gradually narrowing towards acute apex, up to 30 by 13 cm; larger pinnules oblong-subdeltoid, acute at apex, cordate at base, shortly stalked, lobed halfway to costule, up to 8.5 by 1.8 cm; lobes orbicular, serrate, up to 7 mm broad; softly papyraceous, dark green, paler beneath; veins pinnate with 5–8 pairs of simple veinlets. Sori oblong, usually along posterior half of veinlets, thus submarginal, up to 2 mm long; indusia thin but firm, persistent .

Distribution in Thailand

NORTHERN: Phitsanulok; PENINSULAR: Nakhon Si Thammarat.

Wider Distribution

Vietnam, S China, Ryukyu, and SW Japan.

Ecology

On mountain slopes in dense forests at 900–1500 m alt.

Proposed IUCN Conservation Assessment

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

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