[32 \QUAT1C PHYCOMYCETES 



Sporangium spherical or ovoid, discharge tube narrow, often 

 prolonged extrumutrically ; penetration tube not per- 

 sistent on the spherical or ellipsoidal resting spore 



O. luxurians, p. 142 

 In rust spores; sporangium spherical or somewhat angular; 



discharge tube short or only a papilla ... O. uredinis, p. 142 

 In aquatic Phycomycetes 



In resting spores of Allomyces; sporangium often with a broad, 



long, exit tube; zoospores oval, elongate or slightly curved 



with four to nine refractive globules ... O. allomycetos, p. 143 



In thalli, sporangia, and resting spores of Rliizophlyctis; exit 



tube not prolonged; zoospores spherical, lacking globules 



O. RHIZOPHLYCTIDIS, p. 144 



[In moss protenoma O. protonemae x ] 



In animals 

 In eggs and adults of rotifers 

 Sporangium spherical, ovoid, ellipsoidal or irregularly saccate; 

 zoospores spherical ; resting spore lying loosely in a spher- 

 ical structure 



Zoospores with a single globule O. gregarium, p. 144 



Zoospores with numerous globules and a 38-45 y. long 



flagellum O. granulatum, p. 145 



Sporangium predominantly pyriform, ovoid or subspherical; 

 zoospores oblong, with a short (12-14 u.) flagellum and 

 one or two lateral, elongate, refractive bodies 



O. rotiferum, p. 146 

 In /oocysts of Vampyrella 

 Sporangium spherical or broadly ovoid; zoospore without a 



large refractive globule O. vampyrellae, p. 146 



Sporangium ovoid, somewhat irregular, or, if several in a cell, 

 somewhat tubular; zoospore with a minute eccentric glob- 

 ule' O. pseudosporearum, p. 146 



In adult nematodes O. nematodeae, p. 147 



Olpidium endogenum (Braun) Schroeter 



kryptogamenfl. Schlesien, 3 (1): 180. 1885. 

 (Fig. 12 D, p. 124) 



Chytridium endogenum Braun, pro parte, Monatsber. Berlin Akad., 1855: 

 384; Abhandl. Berlin Akad., 1855:60, pi. 5, fig. 21. 1856 (not the forms 

 in Vaucheria and Spirogyra); Monatsber. Berlin Akad., 1856: 588. 



Chytridium intestinum Braun, Monatsber. Berlin Akad., 1856: 589. Non 

 ( . intestinum Schenk. 



1 Not considered in the present work. 



