THE GREEN ALGAE OF NORTH AMERICA 187 



tween tide marks, at Eagle Island, Penobscot Bay, Maine. 

 This material agrees very well with authentic specimens of 

 Schizogonium laetevirens from Calvados, the locality given by 

 Kiitzing ; whether Bangia laetevirens Harvey in Hooker, 1833, 

 p. 317, is the same, can hardly be determined ; that species is 

 ignored by Harvey in his later works. 



The description of U. consociata Wille would seem to indicate 

 the same species. It is our only species of this genus with 

 branching filaments ; the laterally united filaments are also 

 characteristic, resembling those of Schizogonium ; they arise, 

 however, by the union of distinct filaments, not by longitudinal 

 division of a single filament. 



The genus Hormospora Brebisson, has cells practically like 

 those of Ulothrix, but located at a greater or less distance from 

 each other in a relatively large gelatinous filament. Several 

 species have been described, but Cienkowski, 1876, has shown 

 that under certain conditions a species of Ulothrix passed into a 

 state agreeing perfectly with the description of Hormospora, 

 and then by further development into a Palmetto, state. Gay, 

 1891, states that he has examined a number of authentic speci- 

 mens of the original species, H. mutabilis Breb., and found all 

 stages from normal Ulothrix to typical Hormospora. At least 

 four species in this genus were proposed by Wolle at different 

 times, but in Wolle, 1887, pp. 133, 189, he appears to have 

 given up his belief in them. In PI. CXXIV of the same work 

 are figured a number of forms, one of which, H. purpurea Wolle, 

 1880, p. 22, seems to be a good species, but until more is known 

 of its life history, its affinities must be doubtful, but with a prob- 

 ability that it belongs with the Rhodophyceae , among the Bangi- 

 aceae. It has been distributed from Pa. in Wittr., Nordst. and 

 Lagerh., Alg. Exsicc., No. 1358, and from N. H. in P. B.-A., 

 No. 1374. Fig. 65. 



The only other species for which there is a record in this 

 region has recently been described by G. S. West, who 

 thinks that the genus should be maintained, at least provision- 

 ally. As this species is quite different from species previously 

 described, and, if a condition of Ulothrix, probably related to 



