Pyrrosia POLYPODIACEAE Pyrrosia 



bb. Without stellate hairs. 



c. Sori linear, oblique to costa. 



Leaves stipitate; lateral veins distinct 3. Colysis 



Leaves subsessile ; veins indistinct 4 . Loxogramme 



cc. Sori round or oval. 



d. Leaves dimorphous, fleshy 5. Lemmaphrjllum 



dd. Leaves uniform. 



e. Sori multiseriate. 



Lamina glabrous 6. Microsorium 



Lamina with peltate scales; stipe scaly 7. Neocheiropteris 



ee. Sori in a single row on either side of costa. 



f. Lamina glabrous: sori without peltate scales. 



Margin thin, entire 6. Microsorium 



Margin cartilaginous, notched 8. Crypsinus 



ff. Lamina with peltate scales, at least when young: 

 Sori with peltate scales. 



Stipe long, scaly; lateral veins distinct 7. Neocheiropteris 



Stipe short; veins not distinct 9. Lepisorus 



aa. Leaves pinnately or palmately lobed, or pinnate. 



g. Leaves trifid ; margin cartilaginous, notched 8. Crypsinus 



gg. Leaves pinnatifid to pinnate. 



h. Sori linear 3. Colysis 



hh. Sori round. 



Rhizome covered with humus-collecting leaves 12. Drynaria 



Rhizomes without humus-collecting leaves. 



Pinnae articulate to the rachis 10. Arthromeris 



Pinnae adnate to the rachis 11 . Polypodium 



1. Pyrrosia Mirbel 5"|Ei| (Shih Wei Shu; Rock-reed Genus) 



Small to medium-sized petrophilous ferns: rhizomes creeping, scaly: leaves usually 

 simple, coriaceous; under-surface covered with stellate hairs; veins obscure: sori round, 

 superficial or partly immersed, usually covering the under- side of the leaj ', exindusiate. 

 95 species. The name Cyclophorus Desv. has been generally used for this genus. 



Key to the Species 



a. Leaves linear, sessile, 2-4 mm. broad 1 . p, assimilis 



aa. Leaves oblong, ovate or lanceolate, stipitate. 



Rhizome thick: leaves approximate, large, 30-45 cm. tall 2. P. sheareri 



Rhizomes slender, widely creeping: leaves distant; lamina usually 

 small. 



Sori distinct: lateral veins visible 3. P. lingua 



Sori confluent: veins not distinct 4 . P. petiolosa 



1. Pyrrosia assimilis (Baker) Ching (DeV. F. 129). 7-20 cm. tall; fr. V-XI. China; 

 locally in An., Che., Ki. Exposed rocks. 



2. Pyrrosia sheareri (Baker) Ching (Ching 3:147). 30-45 cm. tall; fr. V-X; 3-5 cm. 

 broad. China, Formosa, Tonkin; locally in An., Che., Ki. Mountain streams. 



3. Pyrrosia lingua (Thunb.) Farwell Tongue Fern (DeV. F. 129). 8-30 cm. tall; fr. 

 I V-XI; upper surface sparsely pitted. East Asia; locally in An., Che., Ki., Ku. 

 Exposed rocks. 



4. Pyrrosia petiolosa (Christ) Ching (DeV. F. 129). 3-15 cm. tall; fr. IV-X; upper 

 surface deeply pitted. China, Manchuria; locally in An., Ku. Exposed rocks. 



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