87 



NOTES ON CYANOPHYCE^.— I. 

 By W. A. Setohell. 



In the Bulletin of the Toirey Botanical Club for October, 

 1895 (pp. 424-431), the writer began a series of notes upon 

 new or little-known species of the group of the Blue-Green 

 Algse and made a brief reference to the condition of our 

 knowledge of the North American species. 



The Blue-Green Algse are widely distributed throughout 

 the marine and fresh waters of the earth and many besides are 

 not aquatic but grow simply in moist localities. There is, 

 however, a great similarity as regards species, between the 

 different countries and this will probably be increased as our 

 knowledge of the distribution of the members of the group is 

 increased. 



The writer hopes that more collectors may pay attention to 

 the gathering of these plants, and that they may be sub- 

 mitted ultimately to the highest authorities, Messrs. Bornet 

 and Gomont of Paris, for verification or correction. The 

 writer desires to thank these great monographers for assist- 

 ance in determinations, at every step. 



Calothrix fasco-violacea Crouan has been known only from 

 the Atlantic and Mediterranean shores of France where it is 

 very rare. In these localities it grows upon stones or shells. 

 It was found by Mr, Charles P, Nott of Brown University 

 growing upon fronds of Punctaria plantaginea at Woods Hole, 

 Mass., during the summer of 1895, Upon the Punctaria, it 

 forms orbicular velvety patches, about ^ inch in diameter, 

 which vary from a deep reddish purple to a dark blue green. 

 It resembles C. confervicola Ag., but is distinguished from 

 that species by its gregarious habits and its slightly smaller 

 trichomes. 



Species of the genus Dichotlirix, nearly related to Calo- 

 thrix, are not uncommon, in this country, in ponds and 

 streams but seem to give great trouble in regard to exact 

 specific determination. Wolle has credited a number of 



