226 University of California Pnhlications. [botanv 



Mr. Collins, after a study of the specimens quoted, says that 

 the plants are certainly not C. lanosa var. nncialis, being very 

 much coarser, but ai-e in too poor condition for determination. 



Cladophora cohaerens (Ruprecht) DeToni. 



Ruprecht gives this species as occurring in the North Pacific 

 Ocean, and probably from the Ochotsk Sea. Mr. Collins has 

 examined a Ruprecht specimen and notes that he cannot find 

 any ditferences between this species and C. arcfa of the North 

 Atlantic. 



Cladophora Hystrix (Stroemfelt) DeToni. 



On Fucus, lower litoral zone. Gonzales Point, Victoria, B. 

 C, Tildeii, No. 374! (under C. arcfa form b.) 



Mr. Collins notes that this specimen seems to be Stroemfelt' s 

 Spovgomorpha Hystrix. 



Cladophora composita Harvey et Hooker. 



Forming dense mats on rocks, litoral zone. Port Renfrew, 

 B.C., TiIdni,^o. 376! (under C. cartilnginea) ■ East Sound, 

 Orcas Island, Wash., N.L.G., No. 521! 



The determinations are by Mr. Collins, who says of Miss 

 Tilden's specimen that it belongs here and that there are no two 

 species of Cladophoi-a more utterly unlike than C. compns'ita and 

 C. cartihigiiipa. 



Cladophora Columbiana F. S. Collins sp. no v. 



Forming intricate masses about 3 cm. high, filaments some- 

 what prostrate at the 1)ase, then erect, sparingly dichotomous 

 below, densely- di- or trichotoraously branched towards the 

 fastigiate tips, having occasional solitai'v or secund latei'al 

 branches; tilaments l.lO-ioO f^- diam., cells somewhat ])irifonn, 

 3-6 fJ- diam., long, usually largest at the i)oint of forking, 

 smallest at the base of the cell above; bi-anches and ramuli as 

 large as the main filaments, terminal cell l»lunt, usually some- 

 what clavate. Color deep, ricli green; cell wall thick, i)ellu('id. 



Port Renfrew, B. C, Biifler and Polley! 



Related to C. patentiranira (Montague) Kuetzing., hut with 

 larger diameter and shorter cells, and moi'c densely mid fastigi- 



