586 CRYPTOGAMIA.— FILICES. 



covered with brown hair ; fertile jr. spikelike, 

 sometimes bearing a few leaves. 



2. 0. interrupta : frond pinnate, smooth ; divisions 



pinnatifid ; segments oblong, rather acute, entire : 

 some of the intermediate divisions fructiferous. 

 HAB. Low grounds. Frond 3 — 4 ft. high ; several 

 central pairs of the divisions fertile, dark-br. 



3. O. regalis ; frond bipinnate ; segments oblong, dis- 



tinct, serrulate ; raceme terminal compound. 

 HAB. Swamps. About 4 ft. high, smooth; panich 

 large, very compound. 



607. SCHIZ^A. 



3. pusilla : frond simple, linear, compressed, tortuous ; 



spikes few, conglomerate at the summit of a long 



slender stipe. 



HAB. Pine barrens. Aug. Fronds num., cespit. 



2 in. long j stipe 4 — 5 in. long,Jilif. ; spik. brown. 



608. LYGODIUM. 



L. palmatum : stem flexuous and climbing ; fronds con- 

 jugate, cordate, palmate, with 5 lobes ; lobes en- 

 tire, obtuse ; spikelets oblong-linear, in a com- 

 pound terminal spike. 

 HAB. Shady banks of creeks. July. Frond 3— 

 5 ft. high, smooth, slend. ; fr. subterm. 



609. OPHIOGLOSSUM. Adder's tongue. 



1. O. vulgaium: spike cauline ; frond oblong-ovate, 

 - obtuse, closely reticulate. 



HAB. Wet meadows. June. About -a span high ; 

 leaf solit. entire; spik. linear, 2-r owed. 

 *. O. bulbosum : spike cauline ; frond subcordate- 

 ovate, rather obtuse ; root bulbous. 

 HAB. Low sandy grounds. About 6 in. high ; frond 

 \h in. long, 1 in. broad, reticulate. 



610. BOTRYCHIUM. 



I. B. simplex: stipe with a single frond above ; frond 

 subpinnate ; segments 3 — 5, rarely 7, roundish 

 obovate, sometimes lobed. 



