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



inflated to 39-60At; zygospores ellipsoid, ends more or less- 

 pointed, 32-45m X 48-93m, median wall smooth, yellow. Type 

 in herb. E. N. T. Coll. No. 2955, 2956, 2957. 



In Mr. Bullard's collection there are specimens of this 

 species from Lexington, Arlington, and Middlesex Fells, Mass. 

 The P. B.-A, specimen No. 362, labeled S. Grevilleana, from 

 Medford, Mass., belongs here, rather than to 5. Grevilleana, in 

 which the spores are distinctly ovoid with broad rounded ends. 



S. groenlandica Rosenvinge. 



This interesting form is characterized by quadrately inflated 

 fertile cells, highly refractive cell walls, and unusually long cells 

 and spores. In Mr. Bullard's collection there are specimens 

 from Stony Brook, South Framingham. Middlesex Fells, Way- 

 side Inn, North Eastham, and Maiden Fells, Massachusetts. 

 The P. B.-A. specimen No., 363 labelled S. inflafa, Orange,. 

 Conn., belongs to this species. 



S. fallax (Hansgirg) Wille. 



This species is one of several forms near 5. insignis (Hass.) 

 Kiitzing. If Wille's description is correct and identical with 

 Hansgirg 's material, then S. inconstans Collins becomes a 

 synonym of 5. fallax. Hansgirg's figure suggests that the 

 filaments in his material are homosexual. While Wille's 

 description and figure suggests that the filaments are reflexed 

 and that conjugation does not regularly occur between parallel 

 filaments, with the spores all in one filament. It is difficult to 

 decide just where these rough-spored forms belong as the earlier 

 authors did not pay much attention to spore markings. In this 

 connection the note by Professor Nordstedt in connection with 

 specimen No. 958 in Wittrock and Nordstedt's Algae Exsiccatas 

 is of interest. Until these forms have been clearly separated by 

 a study of the original collections it seems best to use S. fallax 

 for S. inconstans, of which the type is P. B.-A. No. 1568. Here 

 also belongs P. B.-A. No. 1570, Middlesex Fells, Mass., and 

 P. B.-A. No. 1571, Wakefield, Mass. 



S. floridana nov. sp. 



Cellulis vegetativis 56-66/x x 120-335/x, dissepimentis planis; 

 chromatophoris 4-5, subrectis vel anfractibus arctis .5; cellulis 

 conjugatis abbreviatis, inflatis (ad 135^) et geniculatis; canalis 

 conjugationis brevis et latis; zygosporis ellipticis, 75-l()5)U x 

 95-135/i membrana media glabra, lutea. 



