Family

Hymenophyllaceae

Nomenclature

Cephalomanes javanicum (Blume) C.Presl, Abh. Königl. Böhm. Ges. Wiss. Ser.5, 5: 334. 1848; Bosch, Hymenophyll. Javan.: 30, t. 22. 1861; Ching, Fl. Reipubl. Popularis Sin. 2: 189, pl. 14, f. 1–4. 1959; Tagawa & K.Iwats., SouthE. Asian Stud. 3(3): 74. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 43. 1967; Tagawa & K.Iwats., Acta Phytotax. Geobot. 23: 52. 1968; Tagawa & K.Iwats., Fl. Thailand 3: 96. 1979; Boonkerd & Pollawatn, Pterid. Thailand: 25, 67. 2000. – Trichomanes javanicum Blume, Enum. Pl. Javae.: 224. 1828; Bedd., Handb. Ferns Brit. India: 44, f. 21. 1883; Christ, Bot. Tidsskr. 24: 103. 1901; C.Chr., Bot. Tidsskr. 32: 340. 1916; Copel., Philipp. J. Sci. 51: 246, pl. 52, f. 1. 1933; Tardieu & C.Chr., Fl. Indo-Chine 7(2): 68. 1939; Holttum, Rev. Fl. Malaya ed. 1, 2: 102, f. 38. 1955 [‘1954’]; Holttum, Dansk Bot. Ark. 20: 17. 1961.

Description

Lithophytic or terrestrial, often in stream beds. Rhizome erect, bearing many wiry roots and a tuft of fronds. Stipes wingless, dark stramineous, covered with dark brownish hairs, 0.8–1.2 mm in diameter, 5 cm or more long. Laminae pinnate, lanceolate in outline, gradually narrowing both upwards and downwards, 10–20 cm long, 2.5–4 cm wide; rachis very narrowly winged, sparsely hairy; pinnae many, with very short stalks, oblong-lanceolate, round at apex, unequally cuneate at base, serrate at margin, up to 2.5 cm long, 0.8 cm broad. Sori on acroscopic side of the upper pinnae, 2 to 5 on each pinna; fertile pinnae deeply cut on both sides of each sorus, sorus placed at apex of a lobe and the tips of involucre on the line of the edges of pinnae; involucre tubular, truncate at mouth, narrowly winged, thick in texture, 2 mm long, 1 mm diam.; receptacles very long extruded.

Distribution in Thailand

SOUTH-EASTERN: Chanthaburi, Trat; PENINSULAR: Ranong, Surat Thani, Phangnga, Phuket, Trang, Satun, Yala.

Distribution in Cambodia

Koh Kong.

Wider Distribution

Throughout SE Asia.

Ecology

On sandy slopes or on wet muddy rocks by streams in dense evergreen forest at low or medium altitudes.

Proposed IUCN Conservation Assessment

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

Voucher specimens - Thailand

Middleton et al. 4621, Trat, Ko Chang, Trail from Khlong Phlu Ranger Station (E).

Voucher specimens - Cambodia

Long et al. CL534, Koh Kong (P).