1920] Setchell-Gardner : Chlorophyceae 145 



of other cells of the dichotomies is suppressed and they remain within 

 the colony ; the cell stalks show strong cellulose reaction to Chloriodide 

 of Zinc ; the cortical cells are changed into zoosporangia ( ? ) containing 

 8-16 or occasionally more zoospores. 



Growing on rocks and pebbles in tide pools in the middle and 

 upper littoral belts. West coast of Whidbey Island, Washington, Port 

 Renfrew, Vancouver Island, Farallones Islands and Point Carmel, 

 California. 



Setchell and Gardner, Alg. N.W. Amer., 1903, p. 204, pi. 17, f. 1-7 ; 

 Collins, Green Alg. N. A., 1909, p. 141; West, Algae, vol. 1, 1916, 

 p. 188; Collins, Holden and Setchell, Phyc. Bor.-Amer. (Exsicc), no. 

 909. EchaUocystis Willeana Yendo, Three species of marine Echallo- 

 cystis, 1903, p. 199. EchaUocystis tuherculata (S. and G.) Wille, 

 Nachtrage, 1909, p. 28 (in part). 



Wille (1909, p. 27) places ColUnsiella as a synonjTn under Echnllo- 

 cystis Bohlin, but Collins (1909, p. 141) and West (1916, p. 188) 

 keep it distinct. It seems to differ from EchaUocystis in forming an 

 extencled and definite gelatinous thallus, in the more vertical and 

 regular division of the cells, and in the longer gelatinous stalks to the 

 cells. Because of the first of these differences. West (lac. cit.) places 

 it in the subfamily Palmophylleae of the Palmellaceae and next to 

 Palmophyllum. This disposition of the genus seems to be the most 

 satisfactory and is adopted here. Collins (1909, p. 141) assigns the 

 EchaUocystis WiUeana Yendo, from Port Renfrew, British Columbia, 

 to CoUinsieUa tuherculata S. and G. as a synonym, and draws his 

 description from both those of Yendo and of Setchell and Gardner. 

 Yendo, however, in his remarks (1903, p. 204) states that it seems to 

 him highly probable that CoUinsieUa tuhercidata may be a young 

 and sterile form of a plant closely related to his EchaUocystis 

 WiUeana, if not the same species. We have not had the opportunity 

 of examining a plant of EchaUocystis WiUeana, but judging from 

 Yendo 's description and plates, there are some differences. In the 

 Wliidbey Island plant there is a sort of basement membrane from 

 which bullate swellings rise as indicated in the habit figure of Setchell 

 and Gardner (1903, pi. 17, f. 1). Yendo figures isolated, much folded 

 thalli (1903, pi. 8, f. 1) attached by rhizoidal outgrowths on the 

 underside (loc. cit., pi. 8, f. 2, 6, 12). No such' outgrowths have been 

 detected in the plant from Wliidbey Island or in any others of our 

 collections. These are, perhaps, minor and unessential differences, but 

 they indicate that there is a reason to feel uncertain as to the absolute 



