234 FRESH-WATER ALGJE OF THE UNITED STATES. 



Collected this plant in small pool on margin of river, 

 Bethlehem, Pennsylvania. It may not be absolutely the 

 same plant as described by Wittrock, but it is too near to be 

 separated as a new species. 



Plate CXLIX, figs. 1-5, sterile cells, cells forming spores, 

 and bearing matured spores. 



Genus 79, STAUBOSPERMUM, Kg. 



Filaments geniculate, zygospores short cylindrical, in front 

 view Quadrangular; in lateral view narrow elliptical, between 

 the truncated corners of, usually, four sessile lateral cells. Cells 

 often twenty times longer than broad. 



STAUROSPERMUM CAPUCINUM, Kg. 



Diameter of vegetative filaments, 14-20 yw ; cells 6-14 

 times longer than broad ; zygospores quadrate, angles obtuse, 

 truncate or incurved, sides often deeply sinuate. Sporo- 

 derm smooth. Filaments acquire a bluish tinge and with 

 age a purple hue. 



Ponds, widely distributed, the most frequent of our species. 



Syn. Staurocarpus glutinosus, Hass. ; 8taurocarpus capucinus. Kg.; 

 Leda capucino, Bory. 



Plate CL, figs. 1-5, sterile filament ; immature spore and 

 three forms of matured spores. 



STAUROSPERMUM QUADRATUM, Kg. 







Diameter of vegetative filaments, 8-12 ^ ; cells 8-18 times 

 longer than broad, forming floating masses of considerable 

 size. Zygospores quadrangular, sides straight, angles trun- 

 cate, membrane punctate or porose. Spores, 28-40 yw. 



Ponds, New Jersey, frequent. 

 Syn. Staurocarpus quadratus, Hass. 



Plate CL, figs. 6-8, three zygospores of different sizes. 



STAUROSPERMUM VIRIDE, Kg. 



Diameter of filaments, 6-8 // ; cells 6-10 or more times 

 longer than broad ; zygospores mostly quadrangular, with 

 sides more or less deeply incurved ; membrane smooth. 



Syn. Staurocarpus gracilis ; S. virescens; S. affinis, all by Hass.; 

 Staurospermum franconicum, Beinsch. 



Small pools and ponds, Florida. 



Plate CL, figs. 9, 10, a quadrangular, and a triangular 

 zygospore. 



