Leptochilus minor Fée

Family

Polypodiaceae

Nomenclature

Leptochilus minor Fée, Mém. Foug., 2. Hist. Acrostich.: 87. 1845; Nooteboom, Blumea 42: 292. 1997; Nooteboom, Fl. Males., Ser. II, Ferns and Fern Allies 3: 88. 1998; Boonkerd & Pollawatn, Nat. Hist. J. Chulalongkorn Univ. 2: 1. 2002. – Acrostichum minus (Fée) Mett., Fil. Hort. Bot. Lips. 20. 1856. – Gymnopteris minus (Fée) Hook., Sec. Cent. Ferns t. 78. 1861. – Campium minus (Fée) Copel., Philipp. J. Sci. 37: 345. 1928. – Dendroglossa minor (Fée) Copel., Gen. Fil.: 199. 1947. – Colysis minor (Fée) M.G.Price, Kalikasan 3: 176. 1974. – Type: Cuming 326 (K, P), Philippines, Samar.

Description

Rhizome dorsiventrally flattened, 1.5–2.2 mm wide, short creeping, the internodes 3–10 mm long, not white waxy, roots densely set; vascular strands 4–10, with or without sclerified sheaths; sclerenchyma strands 0–50. Rhizome scales pseudopeltate, sparsely set, slightly spreading, narrowly ovate or triangular, 1.2–3 by 0.2–0.75 mm, clathrate or subclathrate, margin denticulate, apex acute, cells longitudinally rectangular towards the apex, central region glabrous or bearing multiseptate hairs. Fronds strongly dimorphic, sessile or stipitate, herbaceous. Fertile fronds: stipe 1–32 cm, 0.5–1 mm thick; lamina simple, narrowly ovate to linear, 0.1–0.4 cm wide. Sterile fronds: stipe absent or to 3 cm long; lamina narrowly elliptic to obovate, 1.7–42 by 0.6–2.3(–2.5) cm, index 4–20, base cuneate-angustate, decurrent, forming two ridges at base of stipe, margin entire, apex rounded, rarely acute, lower surface without acicular hairs. Venation: veins more or less immersed and indistinct, 2–10 mm apart, zigzag, dichotomously branched below or at the middle, or each costal areole giving rise to two lateral veins, thus the lateral veins seemingly branching at or near the costa, connecting veins 1–2(–3), anadromous, forming more or less equally sized areoles or one row of large areoles bordered by several smaller areoles; included venation variously anastomosing, smaller veins more or less immersed and indistinct, free veinlets simple or once forked. Sori acrostichoid. Spores monolete .

Distribution in Thailand

SOUTH-WESTERN: Kanchanaburi; PENINSULAR: Ranong.

Wider Distribution

India, Sri Lanka, Indochina, Sumatra, Borneo, Philippines, Sulawesi.

Ecology

Terrestrial or lithophytic , often on rocks in streams.

Proposed IUCN Conservation Assessment

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

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