338 FRESH-WATER ALG.E OF THE UNITED STATES. 



cells show they are punctate ; rarely distinctly granulate. 

 Semi-cells very slightly tapering from the base to the apex. 



Diameter of cells, 20-22 yw, about twelve times longer than 

 broad. 



Measures taken from cells distinctly granulate, collected 

 by A. C. Stokes in Cypress Swamps, Florida. 



CLOSTERIUM NASUTUM, Nord. Y. Des. U. S., p. 41. 



Specimens of this species from Cypress Swamps, Florida, 

 appear perfectly straight and somewhat thicker and longer 

 than the forms heretofore noted. Apical vacuole distinct. 

 Chlorophyl arranged in five or six fillets ; centrally sep 

 arated. 



Diameter, 83 // ; length, 7 times more than the breadth. 

 Collected by A. C. Stokes. 



MICROSTERIAS FiMBRiATA, Ealfs. V. Des. U. S., p. 109. 



Fruiting specimens, not heretofore observed, were received 

 from Rochester, New Hampshire, collected by W. N. 

 Hastings. The plants are uniformly smaller than the 

 measure given (Des. I T . S., p. 110), measuring only 125 yw, 

 but corresponding with the smaller measures of Ralfs, 

 Rabenhorst and Kirchner. Thev have much in common, 



/ 



in form, with M. papillifera as figured by Cooke ; but this 

 species is bordered with papillae, not sharp teeth, and the 

 granules at the margins of the lobes are papillae, not distinct 

 spines, as in M. fimbriata. 



Zygospores are orbicular, spinulose ; spines rather slender, 

 elongate, scattered, mostly furcate at the ends, and some- 

 times notched below the middle ; furcate ends, with tips 

 recurved. 



Diameter of cells, about 125 /* ; length slightly more ; 

 zygospores average 75 yw, without spines ; 125 //. with spines. 



ENTEROMORPHA INTESTINALIS, var. PROLIFERA, Ag. 



To page 107 may be added this variety. Have fine speci- 

 mens, collected by F. W. Anderson in a rapid stream, 4000 

 to 5000 feet elevation, Montana. Primarily it is attached to 

 river stones ; later floating in masses. 



Prevails also in salt marshes, Nebraska. C. E. Bessey. 



CHAETOPHORA ENDIVIAEFOLIA. See page 117. 



This form is reported from Montana, very common every- 

 where. 



