NO. 10 DAWSON : MARINE ALGAE, GULF OF CALIFORNIA 251 



RHODOPHYGEAE 



Family PorphyHdiaceae Kylin, 1937a 



Genus GONIOTRICHUM Kutzing 

 Goniotrichum elegans (Chauvin) Le Jolis 



Le JoHs, 1863, p. 103; B0rgesen, 1915, p. 4, fig. 2. Goniotrichum Alsidii 

 (Zanard.) Howe, 1914, pp. 75, 76; Setch. k Card., 1924, p. 741. 



Filaments microscopic, monosiphonous, attached by one unmodified, 

 basal cell, pseudoramose, with a thick gelatinous wall. 



Frequently found with other minute algae in various collections 

 throughout the Gulf. 



The name Goniotrichum elegans has been chosen, following the argu- 

 ments of B0rgesen. Zanardini's name G. Alsidii, though antedating that 

 of Chauvin, should not be used, for as B0rgesen says: "it seems impossible, 

 judging from Zanardini's description and figure to say quite certainly 

 which species of Goniotrichum we have to deal with." In any case, there 

 should be no difficulty in recognizing the present entity in our region. 



Family Bangiaceae 

 Genus ERYTHROCLADIA Rosenvinge 



Rosenvinge, 1909, p. 72; Kylin, 1925, p. 9, fig. 3 c-g. Erythrotrichia 

 polymorpha Setch. & Gard. (not of Howe), 1924, p. 741. 

 Specimens epiphytic on Polysiphonia, D. 402a, Pond Island, Febru- 

 ary, correspond precisely with Kylin's figure (loc. cit.). The Erythro- 

 trichia polymorpha of Setchell and Gardner is undoubtedly a summer 

 example of this species. The disks are older, larger, and more extensively 

 spread than in the winter example. No young disks are present. The ab- 

 sence of any erect filaments on such material does not suggest its identity 

 with Howe's Peruvian plant, which has abundant, long filaments charac- 

 teristic of the genus Erythropeltis. 



Erythrocladia irregularis Rosenv. 



Rosenvinge, 1909, p. 72; Kylin, 1925, p. 9, fig. 3 a, b. 



Specimens growing on the surface of Dictyota, D. 718, Turner's Is- 

 land, July, seem to correspond most nearly to the figures of this species. 

 They are not the same as Erythrocladia subintegra and have more of an 

 irregular structure when young. They had best be referred here awaiting 

 further investigation. 



