Cydosorus ASPIDIACEAE Polystichum 



Base subequal; 3-5 pairs of veins uniting 2. C. aridus 



Base auricled; 2 pairs of veins uniting 3. C. acuminatus 



1. Cyclosorus gongylodes (Schk.) Link {Aspidium gongy lodes Schk.) (DeV. F. 64). 

 60-100 cm. tall; fr. VII-X; under surface of leaf densely pubescent. Asia, Africa, 

 South America; locally in Ki. Water, edge of streams. 



2. Cyclosorus aridus (Don) Ching {Nephrodium aridiim (Don) J. Sm.) (H. S. F. 291). 

 75-100 cm. tall; fr. VII-VIII; indusia glabrous. East Asia; locally in Ki. Stream 

 banks. 



3. Cyclosorus acuminatus (Houtt.) Nakai Chinese Marsh Fern (DeV. F. 65). 30-75 

 cm. tall; fr. VI-XII; indusia pubescent. East Asia; locally in An., Che., Ki., Ku. 

 Stream banks. Fig. 25. 



A 



5. Polystichum Roth Holly Fern ^MM (Erh Chiieh Shu; Ear Fern Genus) 

 Tufted evergreen terrestrial ferns, commonly growing in woods: leaves usually 

 subcoriaceous to coriaceous; margins usually spinulose and aristate; veins free, pin- 

 nately forking; stipes and rachis generally scaly: sori round, dorsal on veins; indu- 

 sitim superior, orbicular, centrally attached, rarely absent: scales often discolorous. 

 About 175 species. (Greek: poly, many, and stichos, row; the sori of some species 

 being in many ranks.) 



Key to the Species 



a. Leaves pinnate. 



Apex of leaf often radicant; pinnae 3-5 cm. long: indusia minute 



or absent 1 . P. lepidocaulon 



Apex not radicant; pinnae 1- 2 cm. long 2. P. deltodon 



aa. Leaves bipinnate. 



b. Leaves tripartite, with a long terminal pinnate portion and with 



a pair of much laiger, pinnate basal pinnae 3. P. tripteron 



bb. Leaves lanceolate. 



Scales on stipe dark brown to black, caducous 4. P. tsus-simense 



Scales rufous-brown, dense, persistent. 



Basal scales dark brown with lighter margins, 2-3mm. broad. 5. P. setiferum 

 Basal scales concolorous, 5-9 mm. broad 6. P. neolobatum 



1. Polystichum lepidocaulon (Hook.) Sm. {Aspidium lepidocaulon Hook.) (H. S. F. 

 250). 20-40 cm. tall; fr. V-X; 2 rows of sori on either side of costa. China, 

 Japan; locally in An., Ki., Ku. Stream banks. 



2. Polystichum deltodon (Baker) Diels (Di. P. 1 (4): 191). 20-40 cm. tall; fr. VI-XI; 

 1 row of sori along adaxial margin, few sori on lower side. China; locally in An. 

 Stream banks. 



3. Polystichum tripteron (Kunze) J. Sm. (Mak. F. 945). 25-50 cm. tall; fr. IV-X. 

 China, Japan; locally in An. Rocky hillsides. 



4. Polystichum tsus-simense (Hook.) J. Sm. Tsusima Holly Fern (B. M. 88). 20- 

 40cm. tall; fr. IV-X; sori medial. China, Japan; locally in An., Che., Ki., Ku. 

 Wooded hillsides. 



5. Polystichum setiferum (Forsk.) Woynar var. Fargesii (Christ) C. Chr. (DeV. F. 

 79). 45-60 cm. tall; fr. IV-X; undersurface with many fibrillose scales. China, 

 Japan; locally in An., Che., Ki., Ku. Wooded hillsides. 



6. Polystichum neolobatum Nakai 50-100 cm. tall; fr. IV-X; underside sparsely 

 scaly. China; locally in An., Ki. Wooded hillsides. 



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