EXPLAXATIOX OF TLATE XTX. 



CYSTOPTEIUS. — (1) Piece of tlie frond of C. l,ull)ifera; (2) a lol.e in fruit, 



enlarged; and (.'3) a small portion more magnified, bearing a fruit-dot 



with its indusium thrown back. 

 WOODSIA.— (1) Small frond of W. glabella; (2) a part of a fruiting pinna 



of the same, magnified ; and (3) a separate indusium, more magnified; 



(4) a jiiece of a fruitful pinnule of W. obtusa, enlarged; and (5) a fruit 



with tlic opened indusium beneath, more magnified. 

 ASPIDIUM. — (1) Pinna of A. (Dryopteris) marginale ; and (2) a magnified 



fruiting ])()rtion ; (3) piece of A. (rolysticlium) acrosticlioides; and (4) a 



small fruiting portion, magnified. 

 ONOCLEA. — Sterile and fertile frond of 0. sensibilis; (1) front view of a 



fruiting contracted ])iunule, enlarged; and (2) the same laid open and 



viewed from the otlier si(k' ; on one lobe the s])orangia are removed from 



tlie veins. 



