Vol. 1] Seich ell- Gar drier. — Algw of Northwestern America. 843 



for it both at Dul)liu and at Loudon without success. The 

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

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

 The specimen distributed Ijy Miss Tilden under the name Cal- 

 litJiamnion svhulatnm (No. 310) is an entirely different plant and 

 will be noted under Platythamnion heteromorpJmm. 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 CaUith'imnion snlndatum; 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 tlie g-eneral agreemeht with the diagnosis 

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

 While Harvey compares the plant w4th C. Americannm Harv., 

 it seems to be nearer to AntitJuoiiiiion Pi/Iai.sai (Mont.) Kjellman. 

 A. America ini III has l(»ng, slender, loose ramuli, A. Pi/laismi more 

 dense, short and stout, while A. SKhidafiiiii, 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 l»;ise to the very acute 

 tip, while in A. Pylaismi 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., 

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

 sithiilafiiiii than in A. American iiiii or A. Pi/laisai, resembling 

 leather some forms of A. floci-ttsmii. The tetraspores in the 

 Vancouver specimens are usually cruciate, l)ut sometimes rather 

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

 des(;ribed by Harvey. While the species is evidently nearly 

 related to A. Piflaismi, A. Jioccosiim and A. Americannm, 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 (1!)()1, \). 439) says that this species was collected 

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



