206 University of California Publications. ibotany 



Scenedesmus denticulatus var. linearis Hansgirg. 



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

 Near Swantown, Whidbey Island, Wash., N.L.G., No. 417! 



Urococcus insignis Hassall. 



Intermixed with other alga? on sods of deserted hut, Cape 

 Nome, Alaska, TT..A.S. !; intermixed with other alga? on drip- 

 ping rocks, Esquimalt, B. C, N.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 

 very thick-walled cells with golden yellow contents. 



Family PROTOCOCCACEib:. 



Chlorochytrium inclusum Kjellman. 



Endophytic in the fronds of various membranaceous red 

 alga 3 . In the fronds of Iridoea laminarioid.es Bory, Unga, Alaska, 

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

 N.L.G., No. 290!; in the fronds of Calhjmmia Phyllophora J. 

 Agardh, Harvester Island, Uyak Bay, Kadiak Island, W.A.8. and 

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

 fronds of Constantinea Sitchensis P. & R., Esquimalt, B. C, 

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

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

 No. 514! 



This plant is probably very common and careful examination 

 will probably 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 Gh. inclusum Kjellman. 



Chlorochytrium Schmitzii Rosenvinge. 



In fronds of Petrocelis Middendorfii (Ruprecht) Kjellman, 

 growing in the upper literal zone. Harvester Island, Uyak Bay, 



