CHYTRIDIALES 155 



broad conical, slightly tapering, mostly extramatrical discharge tube 

 equal to the sporangium in length; other characters unknown. 

 On zoocyst of Leptophrys vorax, Hungary. 



? Olpidium macrosporum (Nowak.) Schroeter 

 Kryptogamenfl. Schlesien, 3 (1): 182. 1885 



Chytridium macrosporum Nowakowski, in Cohn, Beitr. Biol. Pflanzen, 



2: 79, pi. 4, figs. 3-4. 1876. 



Sporangia occurring singly in the eggs of the host, nearly filling 

 these and hence ovoid, 55 [x long by 30 \x in diameter; zoospores 

 ellipsoidal, 10;j, long by 6 u, broad, with finely granular contents 

 and lighter central region, but without a pronounced refractive drop- 

 let, number and position of flagella not observed, escaping through a 

 broad tube which exceeds 150[ji in length and which pierces the wall 

 of the egg, the lower part of the tube persisting after discharge. 



In rotifer (?) eggs, Germany. 



Differing from Olpidium gregarium in occurring singly in the egg, 

 in having a long discharge tube, and in forming large zoospores which 

 lack a refractive droplet. Nowakowski states that the spores are formed 

 in the same manner as in the Saprolegniaceae. From this fact, as well 

 as from the large size of the spores and their want of a refractive glob- 

 ule, it is possible that the fungus is in reality a saprolegnian rather 

 than a chytrid. 



? Olpidium zootocum (Braun) Sorokin 

 Arch. Bot. Nord France, 2: 33, fig. 38. 1883 (separate) 1 

 Chytridium zootocum Braun, Monatsber. Berlin Akad., 1856: 591. 



Sporangium elongate, tubular, curved, discharge tube arising later- 

 ally and extending funnel-like beyond the wall of the animal. 



In Anguillula, coll. Claparede, Germany. 



Schroeter (1885: 182) placed in this species a parasite of Angui/lula 

 with a tubular sporangium which remains attached by an attenuated 

 end to the cyst (5 y. in diameter) of the infecting zoospore. He ques- 

 tions, justifiably, the identity of his fungus with Braun's. Sorokin's 



1 Ibid., 136, pi. 79, fig. 90. 1889. 



