52 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



Description of Genera. 



CEdogonium Lk. Filaments simple, articulate ; the end 

 cell sometimes setiform, sometimes with an acute conical cap; 

 cells enlarged at the upper extremities. The oogonia and 

 antheridia are either on the same or on different filaments. 

 Dwarf males, shaped like inverted flasks, are parasitically sit- 

 uated near the oogonium. The elongated males are inde- 

 pendent and shorter than the female plant. When a cell has 

 reached maturity, it splits below the top by a circular line, the 

 top is raised by growth, and a new cell formed. This may 

 split again, and a new growth push the top up and leave an- 

 other ring ; this may be repeated five or six more times, leaving 

 a new ring each time. 



O.sp. (?),Fig. 96. 



O. cardiacum (Hass.) Wittr. (?), Fig. 228. Male and 

 female specimens. 



[0. crenulato-costatum Wittr.] 



Bulbochaste Ag. Filaments much branched ; almost all 

 the cells thickened upwards, and bearing on that end long, 

 thin, transparent bristles, bulbose at the base. Reproduction 

 as in CEdogonium. The plants are more often mixed than in 

 CEdogonium, and are i nveloped in a quantity of mucus. 



B. sp. (?), Figs. 97, 98. 



[B. intermedia DeBary.] 



ORDER VI. CLADOPHORALES. 



Three families, very like the Siphonales, comprise this 

 order. The thallus is simple or branched, incompletely divided 

 into cells. Each portion contains many nuclei and parietal 

 chloroplasts, with single pyrenoids. Asexual reproduction by 

 resting spores, cysts, or zoogonidia with two or four cilia. 

 Sexual reproduction by heterogamous or isogamous gametes. 



The order is divided into families, as follows : 



Key to Families. 

 1. Filaments unbranched, compound or elongated coeno- 



CyteS SPH^ROPLEACE^E 



Filaments branched 2 



