1917] 
MOORE—CHLOROCHYTRIUM GLOEOPHILUM 273 
either in the vegetative cell or sporangium, is there the 
slightest indication of the radial arrangement of the chloro- 
plast which is supposed to be characteristic of Centrosphaera 
and which Bohlin apparently considered necessary before 
placing his Paraguay plant in this genus. On this point 
Borzi! says: 
“La cavita cellulare é ripiena di un protoplasma ablondante 
di chlorofilla differenziata in numerosi cordoni cilindrici, ora 
dritti, ora leggermente sinuosi, elegantémente disposti a raggio 
intorno al centro della cellula, dal quale si allontanano un po' 
lasciandovi scoperta un'area circolare scolorata.” 
Brunnthaler? in his characterization of Centrosphaera 
states of the chloroplast: ‘‘Chromatophor grün oder gelblich- 
grün, wandstündig, aus zahlreichen Kórnern oder bandfor- 
migen Strahlen bestehend, welche gegen das Zentrum der 
Zelle gerichtet sind und die Mitte freilassen." This is ob- 
viously an expansion of the genus for the purpose of admit- 
ting C. gloeophila, the chloroplast of which shows clearly in 
Bohlin's figure (although somewhat plasmolized) that it in 
no way approaches the arrangement specified by Borzi, but 
is made up of numerous granules. One might well question 
the propriety of such a procedure, particularly since plants 
were not available for examination. I am accordingly not 
inclined to accept this disposition of Bohlin's plant or of the 
one collected at Cuttyhunk—which are undoubtedly the same 
thing—particularly since the present tendency, according to 
West, is to combine under Chlorochytriwm a number of 
genera such as Endophaera, Scotinosphaera, Chlorocystis, 
and Stomatochytrium, the distinguishing characteristics of 
which are trivial or uncertain. The name should therefore 
stand, in my opinion, as Chlorochytrium gloeophilum Bohlin 
(Centrosphaera gloeophilum (Bohlin) Brunnthaler). 
After the vegetative cell of C. gloeophilum matures, the 
wall almost invariably thickens until it is from 5 to 10 д thick. 
This is independent of the peculiar excrescences or irregular 
outgrowths which may be more than half the length of the 
1 Borzi, А, Studi Algologici 1: 90. 1883. 
? Loc. cit. 
* West, С. S. Algae 1: 212. Cambridge, 1916. 
