Dicranopteris GLEICHENIACEAE-HYMENOPHYLLACEAE Hymenophyllum 



dichotomously forked, with stipule-like segments at the forkings: axillary bud small, 

 densely hairy: lamina of indefinite growth, pinnate above the highest fork; segments 

 pectinate: veins 3-6-forked in each group: sori exindusiate, consisting of 6-12 sub- 

 sessile sporangia. 10 species. 

 1. Dicranopteris linearis (Burm.) Underw. {Gleichenia linearis (Burm.) Clarke) 

 (Bd. F. 4). 25-100 cm. tall; fr. IV-X; segments 2-4 cm. long. Asia to Polynesia 

 and New Zealand; locally in An., Che., Ki., Ku. Exposed hillsides. 



2. Hicriopteris Presl HSH (Li Pai Shu; Under-side White Genus) 



Rhizome often one cm. or more thick, widely creeping, clothed with reddish brown 

 ovate or lanceolate scales: leaves distant; stipe often several feet long and up to one 

 cm. thick: aborted central leaf-bud between pinnae large, scaly, with a pair of bracts: 

 lamina of definite growth, bipinnate above the highest fork; veins once forked: sori 

 exindusiate, usually consisting of 3-4 subsessile sporangia. 20 species. 



Key to the Species 



Ultimate segments pointed, separate, oblique to rachis 1. H. laevissima 



Ultimate segments obtuse, approximate, at right angles to rachis 2. H. glauca 



1. Hicriopteris laevissima (Christ) Ching {Gleichenia laevissima Christ) (Ching 

 4:152). Stipes 3-5 dm. high; fr. V-VIII; pinnae 3-4 dm. long. China, Japan, 

 Philippines; locally in Ki. Mountain ravines. 



2. Hicriopteris glauca (Thunb.) Ching {Gleichenia glauca (Thunb.) Hook.) (Bd. F. 2). 

 lm. tall; fr. IV-IX; pinnae 4-6 dm. long. East Asia; locally in Che., Ki. Mountain 

 ravines. 



11. HYMENOPHYLLACEAE Filmy Fern Family WkWM (Mo Chiieh K'o) 

 Usually small epiphytic or terrestrial ferns: leaves one cell thick in nearly all 

 species: sori marginal: sporangia borne on a long bristle-like receptacle, or on a broad 

 compact receptacle which is the elongation of a vein: indusium tubular or bilabiate: 

 annulus complete. The family has usually been considered as consisting of the two 

 genera, Trichomanes and Hymenophyllum, with a total of 650 species; Copeland now 

 recognizes 34 genera. 



Key to the Genera 

 a. Indusium bilabiate. 



Margin of leaves spinulose-dentate 1. Hymenophyllum 



Margin of leaves entire 2. Mecodium 



aa. Indusium tubular. 



Leaves minute, reniform to orbicular 3. Gonocormus 



Leaves pinnate in plan. 



False veinlets present 4. Crepidomanes 



False veinlets absent 5. Vandenboschia 



1. Hymenophyllum Sw. BzMM (Mo Chiieh Shu; Membrane Ferns Genus) 



Epiphytic or petrophilous ferns: rhizome filiform, widely creeping: leaves small 



to medium sized, pinnately decompound; margins spinulosedentate: indusium bilabiate: 



receptacle included or nearly so. 25 species, nearly all from the temperate regions. 



(Greek name for membrane fern.) 



1. Hymenophyllum barbatum Baker (H.S.F. 68). Lamina 2-3 cm. long; fr. VII-VIII; 



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