NO. 8 DAWSON : A REVIEW OF THE GENUS RHODYMENIA 133 



sections made from one of Skottsberg's specimens this distinction is not so 

 prominent as he indicates. However, were material available other than 

 the single specimen which is very difficult to expand after diying, this 

 point might be verified. 



Distribution. — Subantarctic; coast of Chile; Patagonia; Falkland 

 Islands; South Georgia. 



(13) RHODYMENIA PALMATA (L.) Grev., Alg. Brit. (1830), 

 p. 93; Hai-v., Phyc. Brit. tab. 217; J. Ag., Sp. II (1851), p. 376, 

 Epic, p. 329. 



Plate 18, Figs. 3-4 



This species shows the greatest morphological variation to be found 

 within the genus. Compared to other more sharply defined species of 

 less widespread distribution, it must be considered a heteromorphic 

 "macrospecies" of broad ecologic tolerance. The tetrasporic arrangement 

 seems, however, to place it conclusively within the section J. G. Agardh 

 named for it, and within that the species is distinct except for similarities 

 to R. pabnatiformis of the Southern Hemisphere, whose forms have only 

 recently been distinguished from R. palmata. 



Distribution. — Cooler waters of the coasts of the North Pacific and 

 North Atlantic. 



(14) RHODYMENIA SETCHELLII Web. v. Bosse, Liste des 

 Algues du Siboga (1928), p. 462, pi. XI, f^gs. 6-8. 



It is now to be questioned whether this species is really a Rhodymenia, 

 for Mme. Weber states that she sees great resemblance between this 

 species and Fauchea Gardneri, which has been more recently placed as 

 Fryella Gardneri (Setch.) Kylin. Certain morphological characters mark 

 the genus Fryella as distinct ; but, since we cannot be certain as to whether 

 Mme. Weber may have overlooked these or not, we can only leave the 

 species for further inquiiy. Cystocarps were lacking in her specimens, and 

 these will, no doubt, prove decisive when found. Mme. Weber states also 

 that in structure Fauchea Mortensenii W. v. B. resembles very closely 

 both Rhodynienia setchellii and Fauchea Gardneri. 



Distribution. — The type from Tanma, East Indies. 



Section 3. Palmettae J. Ag. (Epicr., 330 (1876)) 



J. G. Agardh defined this section as containing those species in which 

 the tetraspores are located in distinct sori in the frond-apices, and in 

 which the cortical layer is scarcely modified by the presence of sori. This 



