13 



POLYPODIES 



Margins of the fronds revolute, indusioid (i. e. } the sort spuriously indmioid). 



ALLOSORUS. Bernhardt Schrad neues Journ. Bol 1. pL 2. 5. 36. I 2. /, 6. 



(Allosorus, Auct. ; Phorolobus, Desvaux ; Homopteris, Ruprecht ; Pteridis Sp., Auct; Cryptogrammatis Sp., Auct ; 

 Struthiopteridis Sp., Auct. ; Steganiee Sp., Auct.; Onocle^ Sp., Auct; Osmundae Sp., Auct, ; Blechneae Sp., Auct ; Acrostichi Sp., 

 Auct ; Chelanthis Sp., Auct. ; Onychii Sp., Fee). 



Sori spuriously-indusiate, rotundate, covered by the revolute subherbaceous margin of the pinnules, at length confluent into a 

 transverse line (parallel to the margin) often becoming effuse ; the receptacles punctiform. Veins in the fertile fronds simple or forked, 

 from a central costa ; in the more divided sterile fronds simple or forked in the ultimate segments ; venules free. 



Fronds dimorphous, dwarf, herbaceous, bi-tripinnate ; the fertile contracted, i. e., with revolute siliculiform pinnules. Rhizome 

 short decumbent. — {Moore). 



ALLOSORUS ^TELLER! (Rupr.) Caudex 4-6 inches high very slender filiform slightly scaly, fronds thin-membranaceous 

 pale-green bipinuate, sterile pinnules obovate or subrhomboidal sinuato-lobate, fertile ones lanceolate obtuse crenate all more or less 

 petiolate, terminal ones elongated, veins remote simple or forked, sori subrotund, involucres broad continuous very thin membranaceous 

 whitish subconvex but close pressed, stipes very slender dark-brown glossy, superior rachises winged.— Pelhea gracilis, Hook Sp. Fil.il 

 138 ;— Allosorus gracilis, Pr. Gray, Man of the Bot, of North U. St. p. 264. ed. 2. p. 591. t 9 ;— Pteris gracilis, Mich., Ft ii. p. 262, 

 (not Fee.) ;— Cheilanthes gracilis, Kaulf Enum. Fit p. 209 ;— Allosorus Stelleri, Rupr. Diet. Crypt. Ross il.—Lcdeb, FL Ross. iv. 526. 



The figure is taken from Sir W. Hooker's " Species Filicum." 



Hab. N, America, Canada, N. India, Kumaon (alt. 10,000 feet), Champwa, N. W. Thibet. 



PLATE No. LXXIIL 



