CRYPTOGAMIA.— F1LICES. 333 



rior margin incisely dentate ; stipe somewhat 

 hairy. 

 HAB. Shady woods. Frond 18 in. high, thin; sori 

 minute, near the margin. 



597. ASPLENIUM. Spleenwort. 



f. A. rhizophyllum : frond lanceolate, stipitate, subcre- 

 nate, auriculate-cordate at the base, the point 

 very long, filiform, rooting. 



MAB. Rocks. Frond G — 10 in. long, rooting at the 

 extrcm., and producing new plants. 



/3. pinnatifdum : frond pinnatifid ; lobes roundish- 

 ovate, the lower ones crenate. 



HAB. Rocks. Larger than the common variety. 

 2. A. angustifolium : frond pinnate ; divisions alternate, 

 upper ones opposite, linear-lanceolate, somewhat 

 repand, the base truncate on the upper side, 

 rounded on the lower. 



HAB. Low woods. July. Frond 1 — 2 ft. high, 

 the fertile one separate ; sori large. 

 }. A. ebenentn : frond pinnate ; divisions lanceolate, 

 somewhat falcate, serrate, auriculate at the base : 

 stem smooth and pnlishcd. 



HAB Rocky woods. Frond 12 in. high; stipe 

 slend., brown; seg, I in. long, appearing spiral. 



4. A. Trichomonas : frond pinnate ; divisions roundish; 



crenate, obtusely cuneate, and entire at the base ; 

 stipe polished and black. 

 MAB. Rocks. Cespitose — 8 in. high, delicate; 

 seg. 4 — 5 lin. long ; sori few, large. 



5. A. thelypteroida : frond pinnate ; divisions pinnati- 



fid, lanceolate ; segments oblong, obtuse, serrate, 

 confluent at the base ; sori in parallel oblique lines. 

 HAB. Shady woods. About 2ft. high ; frond ovate, 

 sort very numerous ; slipe smooth. 



6. A. Ruta muraria : frond bi pinnate at the base, sim- 



ply pinnate ;it top ; segment! cuneate, obtusely 



dentate at the extremity. 

 IIAB. Dry rocks. Frond 2 — 3 in. high, rather co* 



riaceous ; seg. tubrhombic ; stipe smooth. 

 '■'. A.montanum: frond smooth, bipinnate ; divisions 



lanceolate, pinnatifid ; segments % — 3-toothed. 

 HAB. Clefts of rocks on mountains. 



