NEW MYXOPHYCEAE FIIOM TOKTO KICO 



33 



fluent, composed of 8-13 cells ; gonidaiig-ia unknown ; cells more 

 or less rounded, 2.5-3.2 n diam., purplish-violet. 



Growing in a fountain in the woods near Maricao, no. 1076, 

 type; in a brook near San Lorenzo, no. 49S; on stones in Rio 

 Grande, near Sal)ana Grande, no. 915; and in a stream near 

 "Campo," Maricao, no. 1233. 



R. confluens resembles R. epiphytica S. & G., a species grow- 

 ing on marine algae. Unfortunately, the material is immature, 

 the gonidangia not showing definitely. 



Xenococcus Willei sp. nov. 



Plate 7, figure GO 



Cells forming extensive colonies often completely encircling 

 the host and extending its entire length, very variable in shape 

 and in size, decidedly angular in the juvenile stages, those des- 

 tined to become gonidangia becoming rounded on approaching 

 maturity, bright aeruginous, homogeneous; gonidangia broadly 

 pyrifonn to decidedly irregular, 15-20 \x (up to 30 \i) diam.; go- 

 nidia numerous, 2.5-3 \\ diam. 



Growing on Lynghya majuscula Harvey, in a stream about 

 five kilometers east of Coamo, no. 221 e, typ« ; on twigs in a 

 stream near Maricao, no. 1260. 



The nearest known relative of X. Willei apparently is X. 

 Kerneri Hansgirg, from which it differs in that it forms much 

 more extensive colonies and in that the cells are considerably 

 larger in all of their dimensions. This, as far as I am aware, 

 is the second species which has been reported from fresh water. 



Chamaesiphon portoricensis sp. nov. 

 Plate 7, figure 61 



Filaments cylindrical, rounded at the outer end, 6-8 n long, 

 2.3-2.5 |j diam., mostly solitary; contents of cells pale aerugi- 

 nous ; walls of gonidangia very thin and evanescent. 



Growing on filamentous green algae, in a ditch by Hot 

 Springs, Coamo Springs, no. 396, type; about four kilometers 

 north of Mayagiiez, no. 1323 x. 



The size and shape of this species would seem to relate it to 

 Chamaesiphon minimus Schmidle. It is nearly twice as large in 

 all of its dimensions. 



