226 University of California Publications. [botany 



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

 the plants are certainly not G. lanosa var. uncialis, being very 

 much coarser, but are 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 differences between this species and G. arcta of the North 

 Atlantic. 



Cladophora Hystrix (Stroemfelt) DeToni. 



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

 C, Tilden, No. 374! (under G. arcta form b.) 



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

 Spongomorpha Hystrix. 



Cladophora composita Harvey et Hooker. 



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

 B.C., Tilden, No. 376! (under G. cartilaginea) ; 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 Cladophora more utterly unlike than G. composita and 

 G. cartilaginea. 



Cladophora Columbiana F. S. Collins sp. uov. 



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

 what prostrate at the base, then erect, sparingly dichotonxms 

 below, densely di- or trichotomously branched towards the 

 fastigiate tips, having occasional solitary or secund lateral 

 branches; filaments 150-250 /* diam., cells somewhat piriform, 

 3-6 p diam., long, usually largest at the point of forking, 

 smallest at the base of the cell above; branches and ramuli as 

 large as the main filaments, terminal cell blunt, usually some- 

 what clavate. Color deep, rich green; cell wall thick, pellucid. 



Port Renfrew, B. C, Butler and Policy! 



Related to G. patentiramea (Montague) Kuetzing., but with 

 larger diameter and shorter cells, and more densely and fastigi- 



