Ixviii. &EKEEA OP PEEirs : 



§ POLTPODIBa. 



(a) Margins ^f ike fronds resolute, indusioidf i.e., the son 

 spimously-ind'usiaie. 



96. ALIjOSORTJS, Sernhardi, Schrad. neues Joum. Sot. 

 i. pt. 2, 5, 36, t. 2, f. 6. 



Allosohus, Auct. ; Phoeolobtts, J>e8vanx; Homoptehis, Suprecht ; 



PtEEIDIS Ep.,Auct.; CkYPTOGBAMSIATIS Sp., Attct.i STETJTHIOPTEErDIS 

 sp., Auct. ; Steganle sp., Auct. ; OlfOCLE^ sp,, Auct. ; OSMUNDS sp., 

 Auct.; BlECHNE^ Sp.j^IiC*. ; ACEOSTICHI Sp., ^WCf. ; ChEILANTHIS Sp., 



Auct. J- Ontchii sp.. Fee. 



Sori spviriously-indusiate, rotundate, covered by the rerolute 

 sub-herbaceous margin of the pinnules, at length confluent into 

 a transverse line (parallel to the margin), often becoming effiise ; 

 the receptacles punctiform. Veins in the fertile fronds simple or 

 forked, from a central costa ; in the more divided sterUo fronds 

 simple or forked in the ultimate segments ; venules free. 



Fronds dimorphous, dwarf, herbaceous, bi-tri-pinnate ; the fer- 

 tile contracted, i.e., with revolute sUiculiform pinnules. Khizome 

 short, decumbent. — -The only material difference between this 

 genus, as represented by the common species, A. orispus, and 

 Cryptogramma with which it was doubtfully associated by the 

 author of the latter genus, consists in its having constantly 

 punctiform instead of linear oblique receptacles. In habit and 

 aspect they are the same — dwarf, elegant, much divided, with 

 dissimilar fertile fronds. Nevertheless, attaching, as we do, 

 considerable importance to the nature of the receptacle, we 

 venture to regard them as distinct. 



Ex. : A. crispiis, Semh. I A. Stelleri, Rupr. 



? A. gracilis, Preal. \ ? A, robustus, Kze. 



97. STBUTHIOI'TERIS, Willdenow, Mag. Nat. Ber. 

 1809, 160 ; Sp. PI. V. 288. 



Onoclea, Bemliardi, and Aucf. ; Osmuwd^ sp., Limueug. 



Sori spuriously-indusiate, rotundate, approximate, at length 

 becoming sub-confluent, covered by the revoluto-convolute atten- 

 uated (membranaceo-Bcariose) margin of the frond, which simu- 



