238 BOTANICAL GAZETTE [MARCH 
empty sporangium (fig. 10), presumably a blepharoplast. The 
wall of the sporangium is smooth and firm and about 1 y in thickness. 
According to the classification of ScHR6TER' this fungus belongs 
to the genus Rhizophidium, of which several species have been 
reported as attacking hosts which occur in salt or brackish water. 
Of these, only R. polysiphoniae (Cohn) Petersen resembles the 
species under consideration. This fungus was originally described 
from Helgoland by Coun? under the name Chyiridium polysiphoniae, 
as lacking a mycelium and with a dark colored membrane and a 
definite operculum, although the latter is not shown in CoHN’s 
later figure. PETERSEN‘ redescribed the species as a Rhizophid- 
zum, stating that it possessed a definite mycelium, and, except in 
old specimens, a hyaline membrane, and reports it as occurring 
in several localities in Denmark on Polysiphonia, Ceramium, 
Delessaria, and Callithamnion. The correspondence between this 
species and the form from New Jersey is not complete, since in 
the latter no suggestion of a definite operculum could be seen, and 
some of the sporangia had at least three, possibly more, papillae. 
Nevertheless, the resemblance between the New Jersey species and 
the descriptions and figures of CoHN and PETERSEN is so close that 
it seems inadvisable, without studying living material, to regard 
them as distinct. 
UNIVERSITY OF CHICAGO 
tScHROTER, J., edn In EncLer and Prantt, Die Natiirlichen 
Pflanzenfamilien 1:* 1892 
2 COHN, capeuiaae Chytridii species novae marinae. Hedwigia 4:169-170. 
1865. 
3—_——, Beitriige zur i ee der Phycochromaceen und Florideen. Archiv 
Mikr. Anatomie 321-60. 18 
ETERSEN, H. E., ee a la connaissance des Phycomycetes marins 
(Chytridinae Fischer). Overs. Danske Videnskabernes Selskabs. Forh. 1905:439- 
488. 
