NO. 10 DAWSON: MARINE ALGAE, GULF OF CALIFORNIA 287 



Gallymenia pertusa S. & G. 



Setch. & Gard., 1924, p. 746, pi. 49b. 



J. 105, cast ashore at San Pedro Martir Island, April. Not again col- 

 lected. 



Genus GALLOPHYLLIS Kiitzing 

 Gallophyllis Johnstonii S. & G. 



Setch. & Gard., 1924, p. 746, pi. 51a-b. 



J. 118, on rocks in upper sublittoral belt, Tortuga Island, June. Not 

 again collected. 



Gallophyllis sp. 

 Plate 44, Fig. 4 



D. 198, collected at low tide on the shore of Puerto Refugio, is an in- 

 teresting plant, apparently of this genus. The material is not in such con- 

 dition as to allow it to be described, but the illustration will provide means 

 of establishing its presence in the Gulf flora. 



Family Nemastomaceae 



Genus SGHIZYMENIA J. Agardh 



Schizymenia Johnstonii S. & G. 



Setch. & Gard., 1924, p. 786, pi. 88. Schizymenia violacea S. & G., 1924, 

 p. 786, pi. 25, figs. 37, 38, pi. 87. 

 From a re-examination of the types of Schizymenia Johnstonii and S. 

 violacea, it seems more satisfactory to consider these plants the same spe- 

 cies. The thickness and structure of the fronds, color, and habitat of the 

 two are the same. Both type specimens were collected in the same general 

 locality (Isla Partida and San Esteban Island are not far apart). The 

 thickness of the frond of S. Johnstonii given in the original description 

 (400 fx) is evidently that of a fertile frond. That given for S. violacea 

 (230 ix) is of a sterile frond. These measurements are not comparable. 

 The amount of protrusion of the cystocarps seems variable. Those de- 

 scribed in S. Johnstonii are the more deeply embedded of the two. Other 

 than these unconvincing differences, the type specimens are to be distin- 

 guished only by arbitrary characters of frond-shape, known to be incon- 

 stant in this genus. 



