NO. 10 DAWSON : MARINE ALGAE, GULF OF CALIFORNIA 317 



one which shows freely dichotomous branching, complete cortication, and 

 tetrasporangia which create only a slight degree of swelling of the 

 ramuli. The arrangement of tetraspores, cystocarps, and antheridia as 

 well as the general structure of the plants does not suggest the advisa- 

 bility of maintaining specific distinction from C. sinicola. 



Epiphytic on other algae, D. 434a, San Esteban Island, Feb.; D. 

 468a, same; J. 104, San Pedro Martir Island, April; J. Ill, San Esteban 

 Island, April. 



Ceramium caudatum S. & G. 



Setch. & Gard., 1924, p. 776, pi. 27, figs. 55-57. 



Cystocarps have recently been observed and may be described as fol- 

 lows : large, 500 ii high ; spherical mass of carpospores on a short stalk 

 surrounded by a whorl of 4-6 short branches; spores angular, measuring 

 35-50 IX. 



Epiphytic on other algae: M. 48b, Eureka, May; D. 45, Guaymas, 

 Jan.; D. 100a, Turner's Island, Jan.; D. 129, Turner's Island, Jan.; 

 D. 236a, Puerto Refugio, Jan. 



Ceramium affine S. & G. 

 Plate 51, Fig. 4 



Setch. & Gard., 1925, p. 172. 



The species was described without tetrasporangia, but, in looking over 

 the type specimen, these were discovered on part of it. They are wholly 

 exserted, single at the nodes, on one side of upper branches, naked except 

 for a hyaline envelope, 30-40 /a in diam., not producing alteration of 

 cortex at nodes. 



This species is closely related to Ceramium caudatum. 



Mason 36 (type), Guadalupe Island, off outer coast of Lower Cali- 

 fornia, April; D. 286a, Puerto Refugio, Jan. 



Ceramium fimbriatum S. & G. 



Setch. & Gard., 1924, p. 777, pi. 26, figs. 43, 44; 1937, p. 88, pi. 7, fig. 

 18. 

 To the original description the following observations should be 

 added : In addition to the short, thick, hair-cells arranged on the convex 

 surface of the younger branches, filamentous hairs also may be present, 

 arising secondarily from cells on all sides of the branches. When young 

 and bristlelike they are slightly bulbous at the tips. 



