34 



MEMOIRS OF THE NEW YORK BOTANICAL G.VRDEN 



Chamaesiphon Willei sp. nov. 



Plate 7, figure 02 



Filaments 50-70 n (up to 180 m) long-, 5.8-7.2 n diam., erect, 

 cylindrical to slightly clavate, tapering suddenly at the base to 

 a short stipe, straight or at times curved above ; divisions of the 

 protoplast by horizontal walls proceeding as the filaments elon- 

 gate, at maturity the entire protoplast except 1-2 cells at the 

 base changing into gonidia. 



Growing on Oedogonium sp. in a water reservoir in Rio 

 Piedras, no. 119 h, type ; in a water reservoir, Eio Piedras, no. 

 105 a. 



The plants of C. Willei are the longest that have yet been 

 described. Although the majority average from tifty to seventy 

 microns, they occasionally attain a length of one hundred and 

 eighty microns. The method of gonidia formation seems differ- 

 ent from other members of this section of the genus. Division 

 of the protoplast begins when the filament is only a few microns 

 long and continues as the filament elongates. At maturity the 

 gonidia are formed almost simultaneously. 



Oscillatoria tortuosa sp. nov. 



Plate 7, figure 63 



Trichomes very tortuous, at times completely circinate, rela- 

 tively short, 2.5 M diam. ; cells cylindrical, quadrate to one-third 

 as long as broad, homogeneous to very finely granular, pale 

 aeruginous ; cross walls inconspicuous, not granular ; 2-4 apical 

 cells acute-conical, at times slightly uncinate. 



Growing on or within the gelatinous tegument of Aphano- 

 thece confer fa P. Richt. on a water pipe near a stream by Mari- 

 cao, no. 1147 a, type. 



A species closely related to Oscillatoria articulata, but is tor- 

 tuous, attenuate, and at times uncinate, 



Oscillatoria articulata sp. nov. 



Plate 7, figure 64 



Plants aggregated into thin, aerugirxous strata or scattered 

 among other algae ; trichomes long and flexuous, 2.8-3.2 diam., 

 neither attenuated, uncinate, nor constricted at the dissepi- 



