CRYPTOGAMIA.— FILICES, 38J 



595. WOODSIA. 



W. ilvensis: fronds bipinnatifid ; segments oblong, ob- 

 tuse, the inferior ones repand, upper very entire, 

 hairy beneath ; sori submarginal, at length con- 

 fluent ; stipe villous above. 

 HAB. Rocks. July — Aug. Fronds 6 — Sin. high, 

 beneath chaffy and hairy f cespitose. 



596. ASPIDIUM. Shield-fern. 



v Involucrum subumbilicate or reniform^ attached near 

 the centre of the sorus and opening on all sides. 



t Fronds simply pinnate. 



1. A. acrostichoides : fronds pinnate ; segments lanceo 



late, falcate, acute, ciliate-serrulate, auriculate on 

 one side at the base, subsessile, only the upper 

 ones fructiferous ; sori at length confluent ; stipe 

 chaffy. 

 HAB. Shady rocks. Fronds 15 — 18 in. high; seg. 

 1 in* long ; fructiferous ones smaller. 



1 1 Frond subbipinnate. 



2. A. noveboracense : frond pinnate, the divisions pin- 



natifid, linear-lanceolate ; segments, oblong, ob- 

 tuse, entire, ciliate ; sori marginal ; stipe nearly 

 smooth. 



HAB. Damp woods. July. Frond 1 — 2ft. high: 

 seg. mostly obtuse, pubes. beneath. 

 S. A. Thelypteris : frond pinnate; the divisions pinna 

 tifid, linear-lanceolate, distinct at the base ; seg- 

 ments ovate, acute, entire ; sori marginal, conti 

 guous, at length confluent. 



HAB. Wet woods and swamps. Frond a foot and 

 a half hiqh. Distinct from the preceding? 

 4. A. cristatum : /3. lancastrnnrc : frond lanceolate- 



oVate, smooth, pinnate ; divisions subcordaie, pin 

 natifid ; segment* ti ianinilar-oblon^, snmulosr- 

 rate ; stipe nearly Baked* 



t t t Frond doubly and triply piniutlr. 



7). A. Goldianum : frond broad-ovate, smooth, bipin 

 K k 



