Diplazium cordifolium Blume

Family

Athyriaceae

Nomenclature

Diplazium cordifolium Blume, Enum. Pl. Javae.: 190. 1828; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 102. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 453. 1988; Boonkerd & Pollawatn, Pterid. Thailand: 153, 191. 2000. – Diplazium integrifolium Blume, Enum. Pl. Javae: 190. 1828. – Anisogonium cordifolium (Blume) Bedd., Ferns Brit. India: t. 331. 1870; Bedd., Handb. Ferns Brit. India: 191, f. 92. 1883. – Athyrium cordifolium (Blume) Copel., Philipp. J. Sci. Bot. 3: 300. 1908; Holttum, Rev. Fl. Malaya ed. 1, 2: 548, f. 322. 1955 [‘1954’].

Description

Rhizome short, erect, or ascending, scaly in younger part, about 5 mm diam.; scales narrow, up to 8 by 1 mm, concolorous brown or occasionally bicoloured with a thick black marginentire. Stipes 30–60 cm long, stramineous or brownish in lower part, scaly or glabrescent upwards, grooved on adaxial surface. Laminae simple or imparipinnate; simple frond narrowly oblong-subdeltoid, cordate at broadest base, narrowing upwards towards acuminate apex, subentire to undulate at margin, up to 37 by 13 cm; coriaceous, more or less fleshy; midrib distinctly raised beneath, glabrous; veins branching a few times, irregularly anastomosing in the marginal part; gemmae usually present at junction between stipe and midrib, viviparous; imparipinnate frond with a few pairs of lateral pinnae becoming smaller upwards, up to 60 by 27 cm, lateral pinnae sessile, bearing gemmae at junction between rachis and costa; veins forming angles of 45–55° to costa. Sori elongate along veinlets, up to 4 cm or more long, on both sides of each ve inlet or on acroscopic side; indusia thin but persistent .

Distribution in Thailand

PENINSULAR: Surat Thani, Nakhon Si Thammarat, Trang, Yala, Narathiwat.

Wider Distribution

Throughout Malesia eastwards to the Solomon Islands.

Ecology

On moist sandy mountain slopes in dense gloomy forests at low or medium altitudes, locally fairly abundant.

Proposed IUCN Conservation Assessment

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

Voucher specimens - Thailand

Van Beusekom & Phengkhlai 944, Nakhon Si Thammarat, Khao Luang (P).

Habit

Habit

Lower surface of frond

Lower surface of frond

Lower surface of frond with sori

Lower surface of frond with sori

Lower surface of frond with sori

Lower surface of frond with sori

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