POLYSTICHUM. CYSTOPTERTS. OZ/ 



stalked, but very differently from those of P. angular e. A. 

 lobatum (Sw.) has the pinnae less divided than in the type of 

 the species and the fronds linear-lanceolate and more rigid. 

 //. F. 10. Hedge-banks. P. VII. VIII. E. S. I. 



3. P. angulare (Presl) ; fronds lax drooping lanceolate bi- 

 pmn&t&j pinnules truncate or obtuse-angled below distinctly stalked. 

 N. 173. H. F. 12. Stipe usually long. First upper pinnule 

 scarcely longer than the others, its lower side rounded below, 

 its upper with a large bluntish auricle and forming an obtuse 

 angle with the lower, at the top of the short stalk which is 

 nearly at right angles with the partial rachis ; all short, broad 

 and Bluntish ; or first upper pinnule longer and deeply pin- 

 natifid, all more acute ; or pinnules all narrower and acute. 

 Sheltered woods and hedge-banks, chiefly in the West. P. 

 VII. VIII. E. S. I. 



6. CYSTOP'TERIS BernJi. Bladder-Fern. 



1. C. frag' His (Bernh.) ; frond lanceolate bipinnate, pinnas 

 ovate or ovate-lanceolate, pinnules oblong-ovate or cordate- 

 ovate pinnatifid or cut. a. vera ; usually bipinnate, pinnules 

 rather narrowed below, veins ending at tip of term, teeth or if 

 pinnule emarginate in the 2 teeth not in the notch. Sporules 

 prickly. a. C. anthriscifolia (Roth) ; pinnules ovate acute cut, 

 segments oblong toothed. Cystea fragilis Sm., N. 155. b. (7. 

 cynapifolia (Roth) ; pinnules obovate cut, segments obovate 

 toothed or retuse at the end. C. fragilis E. B. 1587. c. C. 

 angustata (Sm.) ; pinnules lanceolate acute cut, segments lan- 

 ceolate-oblong cut, teeth acute. N. 156. /3. Cyathea dentata 

 (Sm.) ; frond often only subbipinnate, pinnules broadest below 

 blunt bluntly toothed, veins as in a. H. F. 23. N. 154. C : 

 fragilis Roth. Clusters more marginal, often ultimately con- 

 fluent. In well-grow T n plants the pinnules are suddenly widened 

 to their full extent just above their narrow stalklike base. 

 Spores warted. y. C. Dickieana (Sim), pinnae usually over- 

 lapping, pinnules broad blunt, veins reaching the emarginate end, 

 clusters scattered, spores verrucose. 8. C. alpina (Desv.) ; 

 frond bipinuate, pinnae ovate, pinnules ovate deeply pinnatilid 

 with broadly and shortly linear segments partly cloven, veins 

 reaching the blunt end. JE. B. 163. H. F. 24. Fronds much 

 divided but compact and close. I have placed these plants 

 under one species with much doubt. Rocks and walls, y. In 

 a damp cave by the sea near Aberdeen, d. Teesdale. Mr. J. 

 Backhouse I P. VII. VIII. E. S. I. 



