326 The Botanical Gazette. [June, 
ing as soon as freed by the rupture of the surrounding mem- 
brane. Androgynous or heterogynous, the oogonia spherical, 
containing a thick-walled oospore. The antheridia small, ap- 
plied to the oogonium near its base, the pollinodium perfor- 
ating the wall without indenting it. 
Three species: R. interruptum Cornu, R. continuum Cornu, 
Europe; R. Americanum, nov. sp. America. 
Araiospora, nov. gen.—-Plant consisting of a greatly en- 
larged basal cell attached by rhizoids from its base, and sim- 
ilar in character to the segments of the filaments which arise 
often in considerable numbers from its distal extremity. Fil- 
aments repeatedly umbellately branched, cylindrical or nearly 
so. Zoosporangia arising from the distal end of the segments 
in whorls or umbels of two kinds, the one smooth, the other 
differently shaped and furnished with prominent spines. Z00- 
spores finely granular, biciliate, monoplanetic, emerging in 4 
mass at first surrounded by a thin membrane which ruptures 
almost immediately. Oogonia in whorls or umbels, often as- 
sociated with the zoosporangia, spherical, separated from the 
segment, like the zoosporangia, by a constriction. Oospores 
solitary, thick-walled, surrounded by a cellular envelop de- 
rived from the periplasm. Antheridial branches arising from 
special segments, simple or branched, the small rounded an- 
theridia applying themselves close to the base of the 000 
nium. 
Two species: A. pulchra, nov. sp., America; (?) A. spas? 
(Cornu), Europe. 
SAPROMYCES.—Plant arising from a basal cell attached by 
thizoids from its base and resembling in all respects the Se 
ments of the filaments which arise in small numbers from 1% 
apex. Filaments as in Araiospora. Zoosporangia eon 
elongate, sub-cylindrical or broadly clavate. Zoospores ei 
Araiospora. Oogonia borne in whorls or umbels, pe 
often encrusted. Oospores solitary, thick-walled. eae 
ynous or heterogynous, the antheridial filaments arising re 
tally from the segments, the portion immediately below! 
antheridium twisted on itself. Antheridium long oblong 
of a beak-like process by which the wall of the latter de 
dented before perforation. 
Three species: S. Reinschit (Schroeter) Fritsch, pr 
pe; S. androgynus, nov. sp., America; S. long 
(Cornu), Europe. 
rica 
tus 
