1920] Sctchell-Gardiicr: Chlorophyceae 149 



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

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

 is to be referred provisionally to Chlorochijtrium, but does not 

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

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

 cells, depressed vertically and measuring about 160/i, by 240/x, seem- 

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

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

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

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

 type, whicli is probably Chytridiaceous, possibly being near to Rhodo- 

 chytrium. The}' are probably the so-called gland cells mentioned 

 by Schmitz as occurring in Tunierella Mertensiana (P. and II.) 

 Schmitz (1896, p. 372) and figured as occurring in 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 Fryeana 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. Chlorochytrium Schmitzii Rosenv. 



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

 thickening of the cell wall, and witli i)ointed base ; up to 370/x. long by 

 90ju, diam. ; chromatophore single, occupying the greater part of tlie 

 cell wall, and with two ])yrenoids. 



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

 Alaska. 



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

 Alg. X. A., 1909, J). 147; Setchell and Gardner, Alg. N.W. Amer., 

 1903, ]). 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 Wliidbey 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. Olhcr cells hav(^ pajiillate swellings at one or both 



