give rise to spermatia which fuse with vegetative cells, after which 

 reproductive cells known as carpospores are formed. 



This subclass contains but a single order, the Bangiales, which 

 is represented in our region by 2 genera. 



ORDER BANGIALES 



Characters as described for the subclass. The three families which 

 comprise this order are the Bangiaceae, in which spores are formed 

 by divisions of unspecialized vegetative cells, the Erythrotrichiaceae, 

 in which spores are borne in special sporangia, and the Goniotri- 

 chaceae, in which spores are simply modified vegetative cells 

 formed without division of the protoplast. Only the latter family 

 is represented in our collections. 



FAMILY GONIOTRICHACEAE 



In this family the plants are simple or branched, pseudofilamentous 

 thalli. Reproduction occurs as described above, sexual reproduction 

 being unknown. 



ASTEROCYTIS ( Thwait. ) Gobi 1879, p. 93 

 Filaments simple or branched, composed of globose or oblong 

 cells inclosed in broad gelatinous sheaths, arranged in a more or 

 less irregular uniseriate manner. The cells may be closely arranged, 

 or at some distance from one another. The chloroplast is axial and 

 stellate and contains a central, usually conspicuous pyrenoid. 



Asterocytis smaragdina (Reinsch) Forti 1907, p. 691 



PI. 135, Fig. 3 



Characters as described for the genus; filaments simple or 

 branched, occasionally somewhat palmelloid, the branches develop- 

 ing by a cell slipping to one side of the series and continuing to 

 divide in another plane; cells Q-Wp. in diameter, 8-I6/1, long. 



Attached to stones and to strands of coarse filamentous algae. 

 North Trout Lake and Fishtrap Lake, Vilas County, Wisconsin; also 

 reported (C. E. Allen correspondence) from Lake Mendota, Wis- 

 consin. 



BANGIOIDEAE OF UNCERTAIN POSITION 

 FAMILY PORPHYRIDACEAE 



PORPHYRIDIUM NaegeH 1849, p. 139 

 Unicellular but with many individuals aggregated to form an 

 irregularly expanded, thin, gelatinous layer. Cells mostly spherical, 



[563] 



