CRYPTOGAMIA FILICES. 451 



414. ASPLENIUM. Spleenwort. 



A. ebeneum: frond pinnate; divisions lanceolate, somewhat falcate, ser- 

 rate, aunculate at the base ; stem smooth and polished. 



HAB. RocKy woods. Frond 12 in. high; stipe slend., brown; seg. 

 I in. long, appearing spiral. 



A. trichomanes : frond pinnate ; divisions roundish, crenatc, obtusely 

 cuneate, and entire at the base ; stipe polished and black. 



HAB. Rocks. Cespitose 6 8 in. high, delicate ; seg. 4 5 lin. long ; 

 sori few, large. 



A. thelypter aides : frond pinnate ; divisions pinnatifid, lanceolate ; seg- 

 ments oblong, obtuse, serrate, confluent at the base ; sori in parallel 

 oblique lines. 



HAB. Shady woods. About 2 feet high ; frond ovate ; sori -very nu- 

 merous ; stipe smooth. 



A. ruta muraria : frond bipinnate at the base, simply pinnate at top; 

 segments cuneate, obtusely dentate at the extremity. 



HAB. Dry rocks. Frond 2 3 in. high, rather coriaceous ; seg. sub- 

 rhombic ; stipe smooth. 



415. PTERIS. Brake. 



P. aquilina : frond tripartite ; divisions bipinnate ; segments oblong- 

 lanceolate, the lower ones pinnatifid, upper ones entire. 



HAB. Woods. 2 4 feet high ; stipe long, erect, smooth ; frond am- 

 ple, circumf. trian. 



P. atropurpurea : frond pinnate ; inferior divisions ternate or pinnate ; 

 segments lanceolate, obtuse, obliquely truncate or subcordate at the 

 base. 



HAB. Rocks. A span high; frond grayish green; fructif. conspi- 

 cuous ; stipe dark br., subpubes. 



416. ADIANTUM. Maiden-hair. 



A. pedatum : frond pedate ; divisions pedate ; segments rhomboid-ob- 

 long, sublunate, incisely lobed. 



HAB. Rocky woods. About 1 ft. high; stipe slend., black, polished} 

 frond ample ; segm. entire below. 



417. ONOCLEA. Sensitive fern. 



O. sensibilis : sterile frond pinnate ; segments laciniate, the upper ones 

 united ; fertile frond bipinnate, resembling a compound spike, with re- 

 curved globular segments. 



HAB. Low grounds. Fronds about a foot high ; sterile dilated, sub- 

 trian. ; fertile very narrow. 



418. OSMUND A. Flowering fern. 



O. cinnamomea : sterile frond pinnate ; divisions pinnatifid ; segment* 

 ovate, oblong-obtuse, very entire ; stipe woolly ; fertile frond bipin- 

 nate, woolly. 



39* 



