Filices. 175 



Wl.—POL YPODIUM. 



Indusium absent, sori roundish the margin of the frond not being reflexed 

 to cover them. Fig. p. 173. 



Veins branched, P. vulgare. 



Veins simple, each reaching nearly to the margin, 675 



675 Fronds pinnate, lowest pinnae turning 



downwards, P. Phegopteris. 



675 Frond temate, 676 



676 Frond equally 3-branched, tender, .... P. Dryopteris. 



676 Frond triangular, somewhat 3-branched, rigid, . . P. calcareum. 



POLYPO'DIUM VULGA'RE (112). Common Polypody. 6—8. 

 (iSoi) Rhizome creeping densely covered with pale-brown scales, fronds 



6 — 12 in. deeply pinnatifid, segments \ — \ in. broad linear-oblong 



obtuse. Walls arid banks. 



POLYPO'DIUM PHEGOP'TERIS (73)- Beech-fern. 6—8. Fronds 

 (1804) 6 — 9 in. pinnate, pinnae united at the base pinnatifid, lowest pair 

 deflexed, segments ciliate. Woods and da7np shady places. 



POLYPO'DIUM DRYOPTERIS (69). Oak Fern. 6—8. Fronds 



(1802) with three branches each pinnate with the pinnae deeply pinnatifid 

 (lower ones larger and again pinnate), upper piimas entire. Woods and 

 dry shady places. 



Polypo'dium calca'reum (24). Mountain Polypody. 6 — 8. Frond pin- 



(1803) nate, lower branches again pinnate, upper ones simply pinnatifid erect 

 rigid. [G. {Moughton, Feizor^ Malhatn Tarn), C. CI. 



VW.—PTERIS. 



PTE'RIS AQUILI'NA (112). Common Bracken. 7—8. Fronds 1—6 



(1765) ft. high tripartite, branches bipinnate, pinnules linear-lanceolate sessile 

 often I in. long, upper undivided lower pinnatifid with obtuse segments. 

 Forests, heaths, and vioors. Fig, p. 173. 



N\l\.—B LECH NUM. 



BLECH'NUM BOREA'LE (in). Hard-fern. 7—8. Fronds tufted 

 (1767) 6 — 9 in. dissimilar, barren frond pinnatifid with lanceolate obtuse 



pinnae, fertile frond pinnate with acute linear pinnae with longer stipes 



than the barren frond. Woods and banks. 



\y..—ALLOSORUS. 



ALLOSO'RUS CRIS'PUS (54). Parsley-fern. 7—8. Fronds 3—8 



(1766) iii. dissimilar, barren fronds bi- or tri-pinnate v\ iih wedge-shaped seg- 

 ments, fertile fronds bipinnate with oblong fusiform pinnules. Stotiy 

 places in mountain districts. 



