Volume 3 > Part 1 > Year 1979 > Page 79 > Hymenophyllaceae > Microtrichomanes

Microtrichomanes digitatum (Sw.) Copel.wfo-0001107558

Philipp. J. Sci. 67: 36. 1938; Tagawa & K.Iwats., S.E. Asian Stud. 5: 41. 1967.— Trichomanes digitatum Sw., Syn. Fil.: 370, 422. 1806; Bedd., Handb. Ferns Brit. India: 39. f. 19. 1883; Copel., Philipp. J. Sci. 51: 159. pl. 7. f. 3–4. 1933; Tardieu & C.Chr. in Fl. Indo-Chine 7(2): 66. 1939; Holttum, Rev. Fl. Malaya 2: 94. f. 32. 1955. Fig. 5: 6.

Accepted Name : Hymenophyllum digitatum (Sw.) Fosberg

Description : Rhizome long-creeping, hairy, hairs caducous, pale brownish, up to 1 mm long. Stipes like rhizome, hairs caducous, terete, wingless except in the uppermost part, 2–4 cm long. Fronds rather irregular in outline, almost circular to oblong, every axis winged to form the segments just the same as the ultimate segments, to 5 cm long, 4 cm wide; ultimate segments linear-lanceolate, usually slightly falcate, round to obtuse at apex, 1.5–2 mm broad, usually 1 cm or so in length but occasionally elongate to the length of more than 2 cm, flat and setiferous at margin. Sori sunk in the apices of the ultimate segments; involucre cup-shaped with seemingly bilabiate mouth, 2 mm long including mouth, 1 mm diam, the mouth as broad as the ultimate segments.

Thailand : PENINSULAR: Nakhon Si Thammarat (Khao Luang).

Distribution : Widely known in the Old World tropics: Madagascar, Mauritius, Malaya, Borneo, Java, the Philippines and Samoa, type from ‘Ins. Franciae et Borboniae’.

Ecology : On muddy rocks in dense tropical evergreen forests, known only on Khao Luang, locally abundant there.

Notes: The SE Asiatic form may be separable from the East African type at the rank of subspecies.

E-version notes : For more details see Ferns of Thailand, Laos and Cambodia.