Crepidomanes humile (G.Forst.) Bosch




Crepidomanes humile (G.Forst.) Bosch, Hymen. Jav. 16, pl. 11. 1861; Tagawa & K.Iwats., Fl. Thailand 3: 613. 1989; Boonkerd & Pollawatn, Pterid. Thailand: 70. 2000. – Trichomanes humile G.Forst., Fl. Ins. Austr.: 84. 1786; E.Smith, J. Siam Soc. Nat. Hist. Suppl. 8: 2. 1929; Copel., Philipp. J. Sci. 51: 164, pl. 12. 1933; Holttum, Rev. Fl. Malaya ed. 1, 2: 98, f. 34. 1955 [‘1954’]. – Crepidopteris humilis (G.Forst.) Copel., Philipp. J. Sci. 67: 59. 1938; Ching, Fl. Reipubl. Popularis Sin. 2: 174 pl. 15, f. 8–9. 1959; Tagawa & K.Iwats., SouthE. Asian Stud. 3(3): 73. 1965; Tagawa & K.Iwats., SouthE. Asian Stud. 5: 41. 1967. – Crepidophyllum humile (G.Forst.) C.F.Reed, Amer. Fern J. 38: 89. 1948. – Reediella humilis (G.Forst.) Pic.-Serm., Webbia 24: 719. 1970; Tagawa & K.Iwats., Fl. Thailand 3: 87. 1979.


Rhizome slender, irregularly branching, densely covered with short, dark, brownish hairs. Stipes hairy at base, winged upper part, at most 1 cm long. Laminae rather irregularly pinnately compound, usually bipinnate, oblong to ovate-lanceolate, moderately acute to round at apex, gradually narrowing to cuneate base, at most 3 cm long and 1.5 cm wide; pinnae 2–6 in pairs, ill-differentiated; ultimate segments linear-lanceolate, round to obtuse at apex, 0.8–1.2 mm broad, decurrent to costa and rachis forming wings; two rows of marginal cells elongate parallel to margin, two to four times as long as wide, with cross walls running obliquely downwards and inwards from margin. Sori at the first acroscopic branches of the primary segments; involucre tubular to campanulate, less than 1.5 mm long, copiously winged and immersed in segments; mouth dilated and expanded broadly, almost circular as seen from above.

Distribution in Thailand

PENINSULAR: Ranong, Phuket, Phattalung, Trang.

Wider Distribution

Sumatra to Tahiti, north to Taiwan.


On muddy rocks near the river in dense evergreen forest at low altitudes.

Proposed IUCN Conservation Assessment

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

Site hosted by the Royal Botanic Garden Edinburgh. Content managed by Stuart Lindsay, Gardens by the Bay, Singapore and David Middleton, Singapore Botanic Gardens. Last updated 24 January 2012