vol. i] Setchell-Gardner. — Algce of Northwestern America. 343 



for it both at Dublin and at Loudon without success. The 

 determination of the P. B.-A. speciineu is by Farlow and Collins 

 and may be accepted for the present as representing the species. 

 The specimen distributed by Miss Tilden under the name Gal- 

 lithamnion subulatum (No. 310) is an entirely different plant and 

 will be noted under Platythamnion heteromorphum. We append 

 a note kindly furnished us by Mr. F. S. Collins. 



''It is doubtful if there are any authentic specimens in existence 

 of Harvey's Callithamnion subulatum; Prof. Farlow states that 

 he looked for the specimens in Harvey's herbarium at Dublin, 

 but without success; the specimens now in question are referred 

 to this species from the general agreement with the diagnosis 

 given by Harvey (Proc. Linn. Soc, Bot., Vol. VI, p. 175). 

 While Harvey compares the plant with G. Americanum Harv., 

 it seems to be nearer to AntitJiamnion Pylaismi (Mont.) Kjellmau. 

 A. Americanum has long, slender, loose ramuli, A. Pylaismi more 

 dense, short and stout, while A. subulatum, as here understood, 

 carries these characters to a still greater degree. The articula- 

 tions are shorter, seldom over three diameters in the main 

 branches, while in the lesser ramuli the cells are often broader 

 than long. Every ramulus tapers from the base to the very acute 

 tip, while in A. Pylaiscei the tapering is manifest only near the 

 end, and the terminal cell is not very acute; in New England 

 specimens not so acute as in Harvey's figure (Nereis Bor.-Am., 

 PL XXXVI B). The main branches are less divided in A. 

 subulatum than in A. Americanum or A. Pylaiscei, resembling 

 rather some forms of A. floccosum. The tetraspores in the 

 Vancouver specimens are usually cruciate, but sometimes rather 

 irregular, and might at a hasty glance be taken for tripartite, as 

 described by Harvey. While the species is evidently nearly 

 related to A. Pylai.su i. A. floccosum and A. Am.ericanum, it is 

 as distinct from them as they are from each other; and the 

 specimens examined, nearly one hundred in number, are quite 

 uniform." 



Antithamnion Plumula (Ellis) J. Agardh. 



Saunders (1901, p. 439) says that this species was collected 

 by him several times in Puget Sound, but was not seen in Alaskan 



