1920] SctchcU-Gardner: Chlorophijceue 147 



West reduces Endosphaerti Klebs, Scotinosph<iero Klebs, Chloro- 

 cystis Reinhardt and Stomatochijirium rniiiiiiijiliam to one genus and 

 unites that with Chlorochytrium Cohn. "They all agree in beinii: 

 holophytie. uiiiccllulai'. spho-ical or ncaT'ly so, wliolly or ])artly endo- 

 phytic plants with a single eiin)inat()j)hore, covering tiie wall more or 

 less completely and containing one or more pyrenoids. Reproduction 

 is by piano-gametes or by zoospores or by both" (cf. (Jardner, 1917, 

 p. 383). It seems best to follow West in his conception of the geinis 

 and our species are, consecpiently, assigned to Chlorochi/h-iuin in this 

 extended sense. The three species thus fai' credited to our territory 

 are immersed in the tissues of various membranous or expanded red 

 algae. 



Key to the Species 



1. Cells with apiculatc tip? 1. C. inclusum (p. 147) 



1. Cells without apiculate tips 2 



2. Cells spherical, chromatophores with one pyrenoid 



3. C. Porphyrae (p. 150) 



2. Cells clavate or ovoid, chromatophores with two or more pyrenoids 



2. C. Schmitzii {p. 149) 



1. Chlorochytrium inclusum Kjellm. 

 Plate 13, fig. 1 



Cells in the vegetative condition, spherical or subspherical, entirely 

 included within the host plant, at the time of the formation of the 

 zoospores, slightly elongated, depressed conical, ampullaeform, ovoid 

 or ellipsoid, at length exposed through the penetration of the cortical 

 layer of the host by the apiculate tip, emitting the zoospores through 

 an ostiole. 



Endophytic in the fronds of various membranaceous algae, e.g., 

 Irid<iea, Weeksia, Cmistantinea, etc. Probably common along the coast 

 from Sitka, Alaska, to Puget Sound, Washington. 



Kjellman, Alg. Arctic Sea, 1S.S3, p. 320, pi. 31, f. 8-17; Setchell 

 and Gardner, Alg. N.W. Amer., 1903, p. 1>06?; Collins, Green Alg. 

 N. A., 1909, 11. 147 (in part) ; Collins, Holden and Setchell, Phyc. 

 Bor.-Amer. (Exsiec), no. 514?; Tilden, Amer. Alg. (Exsicc), no. 

 389?. 



The description, given above, is a fairly literal translation of the 

 Latin diagnosis of Kjellman, who adds certain details in his remarks. 

 The original host is Dilsea Integra (Kjellm.) Rosenv. (Sarcophijllis 

 arctica Kjellm.). The cells of the Chlorochytriinii are placecl. in most 



