206 University of California Publications. (botany 



Scenedesmus denticulatus var. linearis Hansgh-g. 



Mixed with other alga? in a pond of slightly brackish water. 

 Near Swantowu, Whidbey Island, Wash., X.L.G., No. 417! 



Urococcus insignis Hassall. 



Intermixed with other algte on sods of deserted hut. Cape 

 Nome, Alaska, ir.A.^\!; intermixed with other algse on drip- 

 ping rocks, Esquimau, B. C, X.L.G., No. 327! 



All stages of this interesting but puzzling organism were found 

 in the collections, from thin-walled cells with green contents, to 

 verv thick-walled cells with golden vellow contents. 



Family PROTOCOCCACEifc]. 



Chlorochytrium inciusum Kjellman. 



Endophytic in the fronds of various memln-anaceous red 

 algfe. In the fronds of Iridcea lamina rioides Bory, Unga, Alaska, 

 A.A.L., No. 5050!; west coast of Whidbey Island, Wash., 

 N.L.G., No. 290! ; in the fronds of Calhjmenia Plnjllophora J. 

 Agardh, Harvester Island, UyakBay, Kadiak Island, ir.A.jS. and 

 A.A.L., No. 5119! ; Unga, Alaska, A.A.L., No. 5055! ; in the 

 fronds of Con.stantinea Sitcliensis P. & R., Esquimalt, B. C, 

 Tilden, No. 389!; in the fronds of SarcopJnjllis Californica J. 

 Agardh, X.L.G., in Collins, Holden and Setchell, P. B.-A., 

 No. 514! 



This plant is probably very common and careful examination 

 will ])robably show it endophytic on other species of red alga^ 

 from other localities, but enough is recorded to give reason for 

 believing that it is by no means uncommon in the region under 

 discussion. It extends down to Monterey on the coast of Cali- 

 fornia and perhaps even farther southward. The form growing 

 on Constantinea has been investigated and reported upon by 

 E. M. Freeman (1899) who decides that it is a true Chlorochytrium 

 and very probably CJi. inrlusuni Kjellman. 



Chlorochytrium Schmitzii Rosenvinge. 



In fronds of Petrocelis Middendorfii (Ruprecht) Kjellman, 

 growing in the upper litoral zone. Harvester Island. Uyak Bay. 



