NO. 10 DAWSON : MARINE ALGAE, GULF OF CALIFORNIA 281 



Grateloupia squarrulosa S. & G. 



Setch. & Gard., 1924, p. 780, pis. 81, 82. 



J. 60 (AHF no. 84), cast ashore, Smith Island, June. Not again col- 

 lected. 



Grateloupia acroidalea S. & G. 



Setch. & Gard., 1924, p. 781, pi. 26, figs. 45, 46. 



J. 121, on lower littoral rocks, Guaymas; M. 58 (AHF no. 82), 

 Guaymas, May. Not again collected. 



Grateloupia Howeii S. & G. 



Setch. & Gard., 1924, p. 782, pi. 83. 



J. 113 (AHF no. 83), cast ashore, San Esteban Island, April. Not 

 again collected. 



"Closely related to Grateloupia denticulata Mont., but according to 

 studies made by M. A. Howe, not identical with that species." Setchell 

 and Gardner. 



Grateloupia Johnstonii S. & G. 



Setch. & Gard., 1924, p. 782, pi. 84. 



J. 88 (AHF no. 81), cast ashore, Angel de la Guardia Island, July; 

 not again collected. 



"This species of Grateloupia seems closely related to G. squarrulosa 

 but differs in thickness, color, number and character of the ultimate pin- 

 nules, and the angle at which the branches arise." Setchell and Gardner. 



Genus ESTEBANIA Setchell & Gardner 

 Estebania conjuncta S. & G. 



Setch. & Gard., 1924, p. 783, pi. 25, figs. 25, 36, pis. 85, 86. 



Several collections of this remarkable plant were made by Johnston 

 in 1921, and one more recent record may be added to these. All are sterile. 

 The habit illustrations of this plant are sufficient to distinguish it at once 

 from any other Gulf species. 



J. 53f, floating or entangled among other algae, San Esteban Island; 

 J. 115, same; J. 103, San Pedro Martir Island, April; J. 130, Angel de 

 la Guardia Island, June; D. 475g, dredged in 30-36 meters, Ensenada de 

 San Francisco, near Guaymas, Feb. 



