CHYTRIDIALES 287 



central refractive globule surrounded by several smaller ones; function- 

 ing as prosporangia in germination" (Karling, loc. cit.). 



Parasitic on a protozoan, Karling {he. cit.), Brazil; United States; 

 snake-skin bait, soil, Sparrow (1952a: 36), Cuba. 



Characterized by predominantly pyriform sporangia with one to 

 three prominent exit papillae often terminating short tubes. 



Rhizophydium conicum Karling 



Amer. J. Bot., 33: 333, figs. 23-24. 1946 



(Fig. 18 F, p. 286) 



'Thalli numerous, up to 30 on a host. Sporangia hyaline, smooth, 

 conical or pyramidal (14 16 : 20-28 ji.) with two to six narrow exit 

 papillae, 2 \l in diam. Zoospores spherical (2-2.5 \x), with a minute 

 refractive globule ; emerging from one or more of the lateral papillae. 

 Rhizoidal system well developed and richly branched. Resting spores 

 conical (6-8 x 10-14 \x), or slightly irregular, hyaline and smooth with 

 one or more large refractive globules; germination unknown" (Karling, 

 loc. cit.). 



Parasitic on Netrium sp., Brazil. 



Distinguished by cone-shaped or slightly pyramidal sporangia, with 

 two to six narrow exit papillae, and conical, hyaline, smooth resting 

 spores. 



Rhizophidium anomalum Canter 

 New Phytologist, 49: 102, figs. 1-2. 1950 



"Thallus monocentric, eucarpic consisting of a sporangium, unswol- 

 len stalk-like portion and a meagre branched rhizoidal system. Spo- 

 rangium flask-shaped, 3.8 jj. broad X 7.7 ;x high to 12.4 [a. broad x 

 28 [i high, embedded except for the apex of the neck in the gelatinous 

 host sheath. Zoospores 5-50 in a sporangium, emerging singly on deli- 

 quescence of the apex of the neck. Zoospore spherical, 2.6 u. in diameter, 

 uniguttulate, posteriorly uniflagellate. Resting spore spherical, 6-11 \x 

 in diameter with a smooth wall and a large oil globule, sexually formed. 



"A zoospore, which later becomes the female gametangium whose 

 contents constitute the female gamete encysts near the apex of the 



