92 



bave examined one in Harvey' s collection in Herb. Trinity College, 

 Dublin. and one in Herb. J. G. Agardh (N. 1743, under L. fissilis 

 J. Ag.). I find both to be fairly lypical plants of L. bulletta f. amplis- 

 sima S. & G. 



There is need of a very considerable study of the forms refer- 

 red by Kjellman and by Setchell and Gardner to L. buttata Kjellm., 

 both from authentic specimens and particularly on the shore from 

 living specimens, to determine, if possible, just how they may be 

 related and what may be the proper botanical name or names. It. 

 may be interesting to note in this connection that n. 1 63 1, Herb. J. 

 G. Agardh, an Esquimalt specimen, evidently from Harvey, has been 

 referred by J. G. Agardh to his L. cuneifolia, but it seems to me 

 also to be clearly the L. buttata f. subsimplex S. & G. 



Renfrewia parvula is the name given by Griggs in Postelsia 

 for 1906 (p. 25 1) to a plant from Port Renfrew on the southern 

 shore of Vancouver Island where the University of Minnesota main- 

 tains a Seaside Laboratory. I am indebted to Professor Griggs for 

 specimens of his plant which are identical specirìcally with those 

 upon which I founded my Laminaria ephemera (Zoe, voi. 5, p. 121, 

 1901). Upon examining specimens of my plant. Professor Griggs 

 coincides with my opinion. On the California coast, this species see- 

 med, from the few observations thus far possible, to be a sort of 

 vernai species, hence my name. This opinion was borne out by the 

 structure of what seemed to be mature plants. Professor Griggs has 

 extended his observations beyond any possible to me and has added 

 many matters of detail of great value. He has been so impressed 

 by the peculiarities of the plants as to create a separate genus, 

 Renfrewia (loc. cit., p. 248) for its reception. He regards the plant 

 as one of the most primitive of the Laminariaceae, on account of 

 its lack of hapteres, mucilage duets, and strengthening tissue, toge- 

 ther with the simplicity of its plant body. He also removes to the 

 genus Renfrewia, two other species, viz. — L. solidungula J. Ag. 

 and L. ye^oensis Miyabe. To the former, 7?. parvula seems to be 

 reasonably closely related as it may possibly also be to Cymathaere 

 triplicata (P. & R.) J. Ag. as Griggs suggests, although the first has 

 a much less delicate structure and also mucilage duets and the lattei" 

 resembles it chiefly in its discoid holdfast. The Laminaria ye\\oensis 



