A TAXONOMIC REVISION OF HYMENOPHYLLACEAE

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4 BLUMEA — Vol. 51, No. 2, 2006 To aid in characterization of taxa recognized by us, representative species of each genus, subgenus or section are enumerated here. Please note that the list includes the minimum number of taxa commonly accepted in recent floristic works, and therefore does not necessarily represent all the members.
A. Ebihara et al.: A taxonomic revision of Hymenophyllaceae <strong>TAXONOMIC</strong> TREATMENT KEY TO THE GENERA 1a. Rhizomes long-creeping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 b. Rhizomes short-creeping or erect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2a. Rhizomes nearly glabrous or sparsely covered with light-coloured hairs. Involucres usually bivalvate (Fig. 2a) . . . . . . . . . . . . . . . . . . . . . . . . . . 1. Hymenophyllum b. Rhizomes covered with reddish to dark-coloured hairs. Involucres usually not bivalvate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3a. Roots absent or replaced by root-like shoots (Fig. 2c) . . . . . . . . . . . . . . . . . . . 4 b. Roots present . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4a. Continuous false veinlets parallel to true veins (Fig. 2d) present. Blade venation catadromous (Fig. 2e) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. Didymoglossum b. Continuous false veinlets parallel to true veins absent. Blade venation anadromous (Fig. 2f). . . . . . . . . . . . . . . . . . . 3. Crepidomanes (subg. Crepidomanes) 5a. Roots few and fine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4. Polyphlebium b. Roots numerous and robust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 6a. Blades once-pinnate to bipinnatifid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 b. Blades bipinnate to highly divided . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 7a. Pinnae asymmetric . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5. Vandenboschia b. Pinnae symmetric . . . . . . . . . . . . . . . . . . . . . 7. Trichomanes (subg. Lacostea) 8a. Marginal laminar trichomes present . . . . 7. Trichomanes (subg. Trichomanes) b. Marginal laminar trichomes absent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 9a. Abortive fronds (Fig. 2g) present. . . . . . . 3. Crepidomanes (subg. Nesopteris) b. Abortive fronds absent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 10a. Minute clavate hairs present on stipes and rachises . . . . . . . 5. Vandenboschia b. Minute clavate hairs on stipes and rachises absent . . . . . . . . . . 6. Abrodictyum 11a. Involucres bivalvate (Fig. 2a) . . . . . . . 1. Hymenophyllum (subg. Fuciformia) b. Involucres tubular (Fig. 2b) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 12a. Blade venation catadromous (Fig. 2e) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 b. Blade venation anadromous (Fig. 2f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 13a. Lamina tough, more than one cell thick . . . . . . . . 7. Trichomanes (subg. Feea) b. Lamina membranous, one cell thick . . . . 7. Trichomanes (subg. Trichomanes) ← Fig. 2. Examples of morphological characters used in the keys. a. Bivalvate involucres (Hymenophyllum deplanchei; Ebihara 001228-05, TI); b. tubular involucres with an exserted receptacle (Rc) (Crepidomanes humile; Iwatsuki 99H06, TI); c. root-like shoots (RS) grown out from rhizomes (Rz) (Crepidomanes bipunctatum; Ebihara 000225-020, TI); d. continuous false veinlets (FV) parallel to true veins (TV) (Didymoglossum bipunctatum; S. Matsumoto 01-820, TNS); e. catadromous venation – FAV: the first acroscopic vein; FBV: the first basiscopic vein in each pinna (Trichomanes polypodioides; T.A. Ohsawa 178-15, TI); f. anadromous venation (Vandenboschia birmanica; A. Narita 1070b, TNS); g. abortive fronds (pointed by an arrow) (Crepidomanes aphlebioides; M. Kato et al. C-13883, TI); h. long bristle-like light reddish hairs on a stipe (Callistopteris apiifolia; Ebihara 040922-03, TI); i. reduced lamina cells (Abrodictyum pluma; R. Jaman s.n., TI). — Scale bars: a, b, d, h = 1 mm; c, e, f, i = 5 mm; g = 5 cm. 5
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A TAXONOMIC REVISION OF HYMENOPHYLLACEAE

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