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FOC | Family List | FOC Vol. 2-3 | Hymenophyllaceae

4. Crepidomanes C. Presl, Epimel. Bot. 258. 1851.

假脉蕨属 jia mai jue shu

Crepidophyllum C. F. Reed (1948), not Herzog (1926); Crepidopteris Copeland; Gonocormus Bosch; Nesopteris Copeland; Reediella Pichi Sermolli.

Plants small to medium-sized, epiphytic, epilithic, or terrestrial. Rhizome wiry and filiform to rather thick, short or long creeping, with dense to sparse short hairs, rootless or with wiry roots (Crepidomanes subg. Nesopteris (Copeland) Ebihara & K. Iwatsuki). Rachis winged throughout or wingless near base. Lamina pinnately decompound or rarely digitate to fan-shaped by reduction, entire, glabrous, with intramarginal or irregularly placed false veinlets or lacking these. Sori axillary or apical on short acroscopic segments; involucres conical to campanulate or funnel-shaped, rounded to acuminate at apex, with bilabiate or truncate mouth; lips circular or triangular, dilated or truncate; receptacles projecting.

About 30 species: Old World tropics and subtropics, from Africa to Japan and Polynesia; 11 species in China.

Crepidomanes grande (Copeland) Ebihara & K. Iwatsuki (Blumea 51: 239. 2006; Trichomanes grande Copeland, Philipp. J. Sci. 6: 70-71. 1911; Nesopteris grandis (Copeland) Copeland; Trichomanes elatum Bosch (1861), not G. Forster (1786), nor Desvaux (1827); described from the Philippines) was recorded from Hainan and Taiwan in FRPS (2: 195. 1959), but it has not been possible to confirm these records.

Crepidomanes intramarginale (Hooker & Greville) Copeland (Philipp. J. Sci. 67: 59. 1938; Trichomanes intramarginale Hooker & Greville, Icon. Filic. 2: t. 211. 1831; described from Sri Lanka) was recorded from Guangdong and Hong Kong in FRPS (2: 163. 1959), but it has not been possible to confirm these records.

Crepidomanes acuto-obtusum (Hayata) K. Iwatsuki (Acta Phytotax. Geobot. 17: 71. 1958; Trichomanes acuto-obtusum Hayata, Icon. Pl. Formosan. 4: 135. 1914) was described from Taiwan but is excluded from the present treatment.


1 False veinlets present   (2)
+ False veinlets absent   (7)
       
2 (1) Submarginal false veinlets absent, but internal false veinlets present   (3)
+ Submarginal false veinlets distinct, internal false veinlets present or absent   (4)
       
3 (2) Fronds more than 3 cm.   3 C. latealatum
+ Fronds less than 3 cm.   4 C. parvifolium
       
4 (2) Fronds more than 3 cm.   1 C. bipunctatum
+ Fronds less than 3 cm   (5)
       
5 (4) One row of normal cells present outside submarginal false veinlets; segments up to 0.7 mm wide.   5 C. kurzii
+ Two rows of normal cells present outside submarginal false veinlets; segments usually 1-1.2 mm wide   (6)
       
6 (5) Submarginal false veinlets continuous, seldom interrupted.   2 C. latemarginale
+ Submarginal false veinlets often interrupted and duplicate.   6 C. rupicola
       
7 (1) Rhizomes erect.   11 C. thysanostomum
+ Rhizomes creeping   (8)
       
8 (7) Marginal cells of lamina elongate and transparent.   7 C. humile
+ Marginal cells of lamina not specialized elongate   (9)
       
9 (8) Lamina pinnate   (10)
+ Lamina simple, forked, or flabellate   (11)
       
10 (9) Rachises winged throughout.   10 C. schmidianum
+ Rachises not winged.   8 C. minutum
       
11 (9) Lamina flabellate.   8 C. minutum
+ Lamina simple or forked.   9 C. vitiense

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