Wood.] l*-^ [June 18, 



the same size as the sporangial cavity ; autheridia bi or tricellular, 

 curved, with the lovrer cell much the largest, generally adhering in con- 

 siderable numbers to all parts of the female plant. 

 Hab. In stagnis prope Philadelphia. 



GENUS BULBOCHAETE. 



B. CANBTII. 8p. Nov. 



B. permagna ad .035" longa, spai'se ramosa; articulis sterilibns dia- 

 metro 2-8 plo longioribus : oogoniis lateralibus vel in ramulorum apicem 

 positis, transverse enormiter ovalibus ; oosporis, transverse enormiter 

 ovalibus, plerumque nonnihil triangularibus, oogonii lumen replentibus ; 

 sporodermate crasso, baud costato, enormiter punctato ; antheridiis bicel- 

 lularibus. 



B. very large, attaining a length or more than one-third an inch, 

 sparsely branched ; sterile joints 2 to 8 times longer than broad ; oospor- 

 angia lateral or placed upon the ends of branches, irregularly trans- 

 versely oval ; oospores of a similar shape often a little triangular, filling 

 the cavity of the sporangium ; spore coat thick, not costate but irregu- 

 larly punctate. 



Diam. cell, steril. 73%^"-^g\r(y"=-00066-001. Spor. transv. ^i^^"=. 00226. 



Hab. In aquis quietis prope Hibernia, Florida, Mr. William Canby. 



Remarks. — It aifords me great pleasure to dedicate this very handsome 

 species to Mr. "William Canby, as an acknowledgment of favors received, 

 and as a testimony of respect and high personal regard for him as a man, 

 and as being among the foremost students of American phanerogamic 

 botany. 



B. DUMOSA. Sp. Nov. 



B. articulis diametro l|-2 plo longioribus ; oogoniis plerumque in 

 ramorum brevissimorum apicibus positis sed interdum lateralibus, 

 plerumque setam terminalem gerentibiis ; oosporis enormiter ovalibus 

 aut ovatis, nonnihil indistincte longitudinaliter oblique subarcte striatis ; 

 antheridiis bicellularibus, stipite instructis, cellula basale medio tumida, 

 supra saepe contracta. 



Joints 1^-2 times longer than broad : oosporangia generally placed upon 

 the ends of short branches but sometimes lateral, mostly carrying a ter- 

 minal seta ; resting spores irregularly oval or ovate, somewhat indistinctly 

 obliquely longitudinally and rather closely striate ; antheridia bicellular, 

 furnished with a little stipe, their basal cell tumid in the middle, fre- 

 quently contracted above. 



Hab. In aquario meo. 



B. IGNOTA. 8p. Nov. 

 B. sparse ramosa, elongata ; articulis diametro max. (jJ--ijg''=.0066) 1^ 

 % plo longioribus ; oogoniis interdum lateralibus et sessibilius, interdum 

 inter ramulorum cellulas vegetativas positis, dissepimento nullo; oosporis 

 ovalibus, longitudinaliter nonnihil oblique et distante costatis, sporo- 

 dermate nonnihil crasso ; antheridiis 3-4 cellularibus, stipitatis. 



