314 University of C<(Ufornia Publications. [botany 



This is one of the most striking- species of Rhodophyeefe 

 found on our American shores. When of full size, it is 40-60 cm. 

 long-, and 15-20 cm. wide, more or less regularly perforated. 

 The tetrasporic plant is smooth and usually more am])le than 

 the cystocarpic plant, which is covered with the dark, prominent, 

 medium-sized cystocarps. Some plants have peculiar i)rolifera- 

 tions from the margins and surfaces, which look like the stipes 

 of the adult plants. They have rounded tips when younger, l)ut 

 later produce miniature blades. It is probalile that they may, 

 under proper circumstances, grow into new plants. The perfora- 

 tions appear on any portion of the frond, new ones being- 

 formed among the older ones. Their formation seems to he 

 accompanied hy the destruction of tissue, probably much as in 

 Agarum as described by Humphrey (1886) . The morphology and 

 anatomy of this species have been treated somewhat superficially 

 by Butters (1899). He had only the cystocarpic plant. The 

 tetrasporangia are l;)orn in the subepidermal tissues and are 

 tripartite or cruciate. They are scattered irregularly over the 

 ])lant. 



Rhodymenia palmata (L.) (Treville. 



On rocks in the upper sublitoral zone. Popof Island, Kukak 

 Bay, Prince William Sound, Yakutat Bay, and (ilacier Bay, 

 Alaska, Saiiiidfrs (1901, ]). 486); Esquimalt and the Strait of 

 Juan de Fuca, B. C, Harvfy (1862, p. 171). 



These reft^rences are evidently all to the f. ti/pica, that of 

 Harvey probably mostly to subf. iiutht, while those of Saunders 

 refer both to that subform and subf. }it<irgin}ffr<i . The speci- 

 mens examined by us have been referred to their proper suliforms 

 as follows. 



Rhodymenia palmata f. typica sul)f. nude Kjellman. 



On stones in the lower litoral and upper sublitoral zones. 

 Amaknak Island, Bay of Unalaska, Alaska, ]r.A.*S'. (ii\<1 A.A.L., 

 Nos. 8264! , 5000! , and in Collins, Holden and Setchell, P. B.-A.. 

 No. 986!; Karluk, Kadiak Island, Alaska, \r.A.*S., No, 5064!; 

 Uyak Bay, Kadiak Island, Alaska, W.A.S. (iikI A.A.L., No. 

 5079b! 



