26 The Ohio Journal of Science [Vol. XVI, No. 1, 



This species is very distinct in the form of its spores and 

 their position in the fertile cells. Lateral conjugation only 

 has been observed. It is possible that the number of chro- 

 matophores is more variable, but in all the vegetative cells in 

 which they could be counted there were three. 



Spirogyra braziliensis (Nordstedt) nov. comb. 



Owing to the indefinite and imperfect description of ^. 

 lineata Suring., the variety Braziliensis Nordstedt, of which 

 we have a perfect description and specimens (W. & N. Alg. 

 aq. dulc. exsicc. No. 360), should be given specific rank. Its 

 connection with S. lineata is very problematical. 



S. fluviatilis Hilse. 



In all the published descriptions of this species the spores 

 are described as smooth, and the number of chromatophores 

 is given as four. I have seen many specimens from Illinois, 

 and collections from the upper peninsula of Michigan (T. L. 

 Hankinson), Minnesota (J. E. Tilden), Hawaii (J. E. Tilden), 

 Massachusetts (P. B.-A. No. 1217), Pennsylvania (E. N. T.) 

 and Guatemala (W. A. Kellerman). In all cases the mature 

 spores are brown and scrobiculate, and the number of 

 chromatophores is three or four. 



S. nova-angliae nov. sp. 



Cellulis vegetativis 50-60/1 x 200-350^, dissepimentis planis; 

 chromatophoris 3-5, anfractibus arctis 2.5-4.5; cellulis fructiferis 

 non inflatis; zygosporis ovoideis 50-65/1x80-120/1: membrana 

 media sporarum reticulata et dense punctata, flava. 



Vegetative cells 50-60/t x 200-350/i, end walls plane; 3-5 

 chromatophores making 2.5-4.5 turns; fertile cells not inflated; 

 zygospores ovoid 50-65/t x 80-120/t: median wall reticulate and 

 densely punctate, yellow in color. 



This species was first found in the collections of Mr. Bullard 

 from Beaver Dam, Brook Pond, Natick; the pond west of 

 Winter Pond, Winchester; and the Middlesex Fells, Mass. 

 Recently the same form was found in a large prairie pond south 

 of Coffeen, Illinois. Its position in the genus is near S. mal- 

 meana Hirn. In herb. E. N. T. Collections No. 2952, 2953 

 and 2900. 



