Asplenium longissimum Blume

Family

Aspleniaceae

Nomenclature

Asplenium longissimum Blume, Enum. Pl. Javae.: 178. 1828; Bedd., Handb. Ferns Brit. India: 145. 1883; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 226. 1940; Holttum, Rev. Fl. Malaya ed. 1, 2: 427, f. 245. 1955 [‘1954’]; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 86. 1967; Tagawa & K.Iwats., Fl. Thailand 3: 281. 1985; Boonkerd & Pollawatn, Pterid. Thailand: 142. 2000.

Description

Terrestrial. Rhizome short, suberect, about 5 mm diam., densely scaly; scales gradually narrowing towards hair-pointed apex, up to 5 by 0.8 mm, entire, dark brown, clathrate with long cells. Stipes up to 20 cm or more long, or lower pinnae placed just above the rhizome leaving stipe of less than 3 cm, purple or darker, scaly when young. Laminae 1–2 m long with indefinite growth, pinnate, a bulbil usually present on rachis near frond apex but not terminal, up to 20 cm or more wide; rachis grooved and scaly with narrow scales on upper surface; lateral pinnae usually more than 50 pairs, sessile or very short stalked, patent or slightly ascending, almost straight, truncate at acroscopic and broadly cuneate at basiscopic bases, slightly rounded and auricled at both sides, gradually narrowing towards caudately long-acuminate apex, slightly serrate at margin, lamina with many 3-pronged small black scales below; midrib with two ridges above, veins once or twice forked. Sori long, from near the midrib, up to 1 cm long, a little curved; indusia rather firm, persistent .

Distribution in Thailand

PENINSULAR: Nakhon Si Thammarat, Yala, Narathiwat.

Distribution in Cambodia

Kompong Thom.

Wider Distribution

Indochina to W Malesia.

Ecology

On rather dry ground along path in light shade at about 200 m alt.

Proposed IUCN Conservation Assessment

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

Voucher specimens - Cambodia

Pierre s.n., Kompong Thom, Chereev Mts (P).

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