M. FOSLIE. I 1 l »i 12 



Thallus 0.5 — 1 cm. thick, forming crusts on rocks, with irre- 

 gularly wartlike or short branchlike, knotty, more or less crowded 

 excrescences. 



As remarked in a pamplet in press 1 ) I have considered a cal- 

 careous alga from the Pacific coast of North America to be a stunted 

 form of G. Brassica-florida (Harv.), being on the other hand un- 

 certain whether the latter and G. mamillare are anything more 

 than forms of one and the same species. I am still uncertain 

 whether these species in fact are specifically distinct, as only rather 

 young specimens of G. mamillare are knovvn, a species which at 

 any rate is closely connected with G. Brassica-florida. I am 

 certainly most inclined to consider both identic, but at present I 

 do not venture to unite them. So also in regard to the above f. 

 Moralis. I have seen but fragmentary and rather small pieces of 

 this form, which seems to be rather varying. Besides the concep- 

 tacles are emptied in the fertile pieces seen and, therefore, I am 

 not quite sure of the nature of the reproductive organs and want 

 to call attention to this form, although I am scarcely of any doubt 

 at all in regard to its relation to the one or other of the said spe- 

 cies. I refer it here to G. mamillare on account of the fact, that 

 the latter with certainty is known only from America, where on 

 the other hand any typical specimen of G. Brassica-florida has 

 not yet been met with. 



The branchlike excrescences in f. Moralis are a little thinner 

 than in the typical form, partly rather densely crowded or 

 almost confluent, partly somewhat scattered and then more 

 irregular in shape and thickness. The conceptacles are often 

 smaller than in G. Brassica-florida, but otherwise agreeing in 

 shape. 



Occurrence. California: Point Fermin, San Pedro in hol- 

 lows near high water mark, Pro f. Setchell, No. 1147; and 

 Pacific Beach near San Diego, Mrs. E. Snyder, comm. Mr. F. 

 S. Collins. 



1 ) Die Lithothamnien des Adriatischen Meeres und Marokkos. — Wissensch. 

 Mesresuntersuchunecen. Abt. He1°'oland. 



