Family

Thelypteridaceae

Nomenclature

Cyclosorus exsculptus (Baker) S.Linds., Edinburgh J. Bot. 66: 359. 2009. – Acrostichum exsculptum Baker, J. Bot. 26: 326. 1888. – Leptochilus exscultus (Baker) C.Chr., Ind. Fil. 9, 385. 1905. – Dryopteris exsculpta (Baker) Copel., Philipp. J. Sci. 37: 410. 1928. – Thelypteris exsculpta (Baker) K.Iwats., ActaPhytotax. Geobot. 21: 170. 1965; Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 175. 1969; Tagawa & K.Iwats., Fl. Thailand 3: 410. 1988. – Pronephrium exsculptum (Baker) Holttum, Blumea 20: 117. 1972; Holttum, Fl. Males., Ser. II, Pterid. 1: 528. 1982 [‘1981’]; Boonkerd & Pollawatn, Pterid. Thailand: 226. 2000. – Type: C.Hose 244, Sarawak, Niah (K [see http://www.kew.org/herbcatimg/249323.jpg]).

Pronephrium affine auct. non (Blume) C.Presl: Holttum, Blumea 20: 121. 1972; Holttum, Fl. Males., Ser. II, Pterid. 1: 527. 1982 [‘1981’].

Description

Rhizome short, ascending; scales small, brown, hairy. Frond dimorphic, fertile frond taller. Stipes hairy throughout, up to 35 cm long in fertile and 17 cm in sterile ones. Laminae oblong to oblong-lanceolate, acute at apex, up to 15 by 4 cm in fertile, and 25 by 5 cm in sterile ones, without distinct terminal pinnae; sterile pinnae 7–25 pairs, gradually narrowing towards acute apex, distinctly auricled at acroscopic and broadly cuneate at basiscopic bases, shortly stalked or sessile, nearly entire, up to 7 by 1(–2) cm; chartaceous, deep green, verrucose below, venation meniscioid, areoles 2 or 3 rows; fertile pinnae narrower, up to 25 by 6 mm, with auricles at acroscopic base, shortly stalked. Sori round when young, indusiate, becoming confluent at maturity; indusia small, dark green, setose .

Distribution in Thailand

PENINSULAR: Yala.

Wider Distribution

Borneo.

Ecology

On logs in streams at low altitudes.

Proposed IUCN Conservation Assessment

Data Deficient (DD). Known only from one locality in Thailand and in Borneo where its distribution and current status are unknown.