Asplenium inaequilaterale Willd.

Family

Aspleniaceae

Nomenclature

Asplenium inaequilaterale Willd in L., Sp. Pl., ed. 4, 5: 322.1810; Sledge, Bull. Brit. Mus. Nat. Hist. (Bot.) 3, 6: 252. 1965; Schelpe & N.C.Anthony in Fl. S. Africa (Pteridophyta ): 191. f. 63:1. 1986; Philcox, Revis. Handb. Fl. Ceylon XV(A): 15. 2006; Boonkerd, ScienceAsia 35: 386. 2009.

Description

Description from Boonkerd, ScienceAsia 35: 386. 2009 for two Thai specimens.
Lithophytic. Rhizome erect to suberect, about 1 cm in diam., apex clothed with scales, scales about 1 mm long by 0.35 mm wide, ovate-lanceolate to sublinear, acuminate, entire, dark-brown centrally, paler at margin. Stipes 12–12.7 cm long, pale to greenish brown, tufted, rounded below, grooved above, glabrous to sparsely pubescent; rachis similar, glabrous. Laminae 18–21.6 x 4.2–5 cm, oblong to oblong-lanceolate in outline, pinnate, apex lobed. Pinnae herbaceous, dark-green, glabrous, up to 20(–25) pairs, pinnae subopposite or alternate, about 1 cm distant, basal pinnae slightly or not reduced in size, 2.0–2.5 x 0.8–1.0 cm, trapezoid-lanceolate, dimidiate, acroscopic base truncate, subparallel to rachis, basiscopic base obliquely excised to about half the length of pinna, acute or subacute, margin incised-crenate or serrate throughout, glabrous. Veins free, forked, nearly reaching the margin. Sori 2–4(–6) pairs, 4–5 x 1.5 mm, mostly midway on veins; indusium membranous, entire .

Distribution in Thailand

NORTHERN: Mae Hong Son.

Wider Distribution

S. Africa, Mascarenes, S. India and Sri Lanka.

Ecology

On rocks in streams at 1550 m altitude.

Proposed IUCN Conservation Assessment

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

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