1^20] Setchell-Gardner : Chlorophyceae 149 



on Iridaea from the west coast of Whidbey Island, Washington, shows 

 small plants (40/* x 80ju,), broadly pyriform and with thick walls. It 

 is to be referred provisionally to Chlorochytrium, but does not 

 agree with Kjellman's description. No. 514, of Collins, Holden and 

 Setchell's Phycotheca Boreali-Americana, shows large, thin walled 

 cells, depressed vertically and measuring about ISOfx by 240jli, seem- 

 ingly a Chlorochytrium, but not in accord with the descriptions of 

 either Kjellman or Freeman. The other references given by us, with 

 the exception of Tilden's no. 389, which is Freeman's plant, are to 

 be rejected. They are found to be based upon plants of the second 

 type, which is probably Chytridmceous, possibly being near to Rhodo- 

 chytrium. They are probably the so-called gland cells mentioned 

 by Schmitz as occurring in Turnerella Mertensiana (P. and R.) 

 Schmitz (1896, p. 372) and figured as occurring ui Iridaea affinis 

 P. and R. (Postels and Ruprecht, 1840, pi. 40, f. 93). We have 

 selected for illustration (pi. 13, f. 1) plants occurring endophytic in 

 Wecksia Fryeaiia Setchell collected by Gardner near Sitka, Alaska. 

 These seem to correspond more nearly than any of our other speci- 

 mens with the description and figures of Kjellman. 



2. Chlorochytrmm Schmitzii Rosenv. 



Cells clavate or ovoid, with rounded apex, without cone-shaped 

 thickening of the cell wall, and with pointed base ; up to 370/^ long by 

 90/x, diam. ; chromatophore single, occupying the greater part of the 

 cell wall, and with two pyrenoids. 



Growing in various incrusting marine algae, e.g., Petrocelis. 

 Alaska. 



Rosenvinge, Groenl. Havalg., 1893, p. 964, f. 56; Collins, Green 

 Alg. N. A., 1909, p. 147; Setchell and Gardner, Alg. N.W. Amer., 

 1903, p. 206 (in part). 



In our Algae of Northwestern America (1903, p. 206), we referred 

 two specimens to this species, one from Harvester Island in Uyak Bay, 

 on the Island of Kadiak, Alaska, and another from the west coast 

 of Whidbey Island, Washington. On reexamination of these speci- 

 mens it seems best to retain the former under this name, in spite of 

 certain differences between it and the figures and descriptions of the 

 Greenland plant as given by Rosenvinge. Certain of the cells in our 

 specimens are rounded above and pointed below, seemingly in vegeta- 

 tive condition. Other cells have papillate swellings at one or both 



