202 FUESII-WATEll ALG.E OF THE UNITED STATES. 



The color of the spore is orange brown, antl the thick coat is slightly tinged witli 

 ycllowisli. The mature oosporangium is somewhat flattened at the sides, not so 

 elliptical as the young spore, wliich I have figured. 



Fi<^ 5 «, pi. 18, represents a fragment of a filament showing young sporangial 

 cells magnified 260 diameters ; 5 h, represents a branch with a youngish spore in it, 

 ma"-nified 160 diameters; fig. 5 c, was taken from a male plant. 



.B. diimo^i.i, Wood 



13. articulis diaiiu'tro H-2 plo longioribus; oogoniis plenimqne in ramorura brevissiraorum 

 iipicibiis positis st'd iiitcrdiuu lateralibus, pleruniquc setaiu terminaleiii gereutibus; oosporis 

 enormiter ovalibus aut ovatis, nounihil indistincte longitudinaliter oblique yibarcte- striatic ; 

 aniheridiis bicellulanbus, stipite iustructis, cellula basale medio tumida, supra sajpe contracta. 



Sijn. B. dumosa, Wood, Prodromus, Proc. Amer. Pliilos. See, 18G9, p. 142. 



Nab. — lu aqiiario mco. 



Joints l|-2 times longer than broad; oosporangia generally placed upon the ends of sLort 

 branches but sometimes lateral, mostly carrying a terminal seta; resting spores irregulaiiy 

 oval or ovate, somewhat indistinctly obliquely longitudinally and rather closely striate; aii- 

 thcridia biccllular, furnished with a little stipe, their basal cell tumid in the middle, frequeutly 

 contracted above. 



Remaihs. — This species appeared spontaneously during the latter part of tlio 

 winter upon some large fresh-water algic which I was cultivating. It brandies 

 irregularly and sometimes somewhat profusely, so as to have quite a busliy liabit. 

 The antheridia appear to produce a single spermatozoon in the terminal cell ; at 

 least as far as my observation has gone this is true. I think I have always found 

 the distal cells of fertile plants emptied of their contents, as though they had fur- 

 nished the androspores which had grown into the antheridia. This species is 

 closely allied to B. gracilis, of Pringsheim, from which it differs in the position of 

 the oogonia, in the relative breadth and length of the cell, and the number of colls 

 composing the antheridia. 



Fig. 6 a, pi. 18, represents a filament of this species magnified 260 diameters; 

 6 h, a male plant magnified 750 diameters. 



B. Canbyii, Wood. 



B. permagna ad .0.35" longa, sparse ramosa; articulis sterilibus diametro 2-8 plo longioribus: 

 oogoniis lateralibus vel in raniulorum apicem positis, transverse enormiter ovalibus; oosporis, 

 transverse enormiter ovalibus, pleruraque nonnihil triangularibus, oogonii lumen rcplentibus; 

 sporoderniate crasso, baud costato, enormiter punctato ; antheridiis bicellularibus. 



Dlam.—Cc]\. steril. ^/jy^"_^J^/ = 00066—001. Spor. transv. tU/ = -00226. 



S)jn.—n. Canbyii, Wood, Proc. Amer. Philos. Society, 1869, p. U2. 



Hab.—\\\ aquis quietis, prope Ilibernia, Florida; (William Canby). 



B. very large, attaining a length of more than one-third an inch, sparsely branched ; sterile 

 joints 2 to 8 times longer than broad ; oosporangia lateral or placed upon the ends of brandies, 

 irregularly transversely oval ; oospores of a similar shape, often a little triangular, filling tlie 

 cavity of the sporangium; spore coat thick, not costate but irregularly punctate. 



Eemarks. — It affords me great pleasure to dedicate this very handsome species 

 to Mr. William Canby, by wliom it was collected in Florida, as an acknowledg- 

 ment of favors received, and as a testimony of respect and high regard for him 



