Family

Pteridaceae, subfamily Vittarioideae

Nomenclature

Vaginularia paradoxa (Fée) Mett., Ann. Mus. Bot. Lugduno-Batavi 4: 174. 1869; Tagawa & K.Iwats., Fl. Thailand 3: 229, f. 17.3. 1985; Boonkerd & Pollawatn, Pterid. Thailand: 134. 2000. – Pleurogramma paradoxa Fée, Mém. Foug., 3. Hist. Vittar. 38, t. 4, f. 4. 1852. – Monogramma paradoxa (Fée) Bedd., Suppl. Ferns Brit. S India: 24. 1876; Bedd., Handb. Ferns Brit. India: 375, f. 214. 1883; Holttum, Dansk Bot. Ark. 20: 34. 1961.

Description

Rhizome short, slender, 0.3 mm diam., bearing close-set fronds, scaly throughout; scales narrowly subtriangular, hair-pointed, up to 2 mm or more long, 0.4 mm broad, dark brown, clathrate, minutely toothed at margin. Stipes not distinct. Frond very narrowly linear, up to 12 cm by 0.5 mm with a costa and several lateral veinlets, texture thin. Sori in a single row on the frond underneath, long-continuous or rarely interrupted .

Distribution in Thailand

PENINSULAR: Nakhon Si Thammarat.

Wider Distribution

Sri Lanka, throughout Malesia to Melanesia.

Ecology

On trunks of old trees in dense evergreen forests at medium altitudes.

Proposed IUCN Conservation Assessment

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