CHYTRIDIALES 277 



of Achlya sp., Dictyuchus monosporus, oospores of Monoblepharis 

 maerandra, Sparrow (1936a: 442, pi. 17, figs. 4-5), Great Britain; 

 Saprolegnia ferax, Karling (1946c: 329, figs. 14-16), Brazil; Achlya 

 sp., soil, Sparrow (1952a: 35), Cuba; pine pollen?, Gaertner (1954b: 

 21), Egypt, Northwest Africa, West Africa, Equatorial East 

 Africa, South Africa; Gaertner (op. cit., p. 41), Sweden. 



This fungus is a very virulent parasite and soon destroys the eggs 

 of the host. Zopf noted that, if oospores were not already differentiated 

 in the oogonia when the attack occurred, the contents of the infected 

 oogonium contracted into a ball of fatty material. The species, while 

 common in gross water cultures of higher Phycomycetes, is for the 

 most part found after vigorous growth of the host plant has ceased. 

 It has been cultivated on agar, pollen grains, and boiled maize stems by 

 Couch (1939a). 



The organism termed Rhizophydium carpophilum by Coker (1923: 

 186, pi. 62, figs. 11-13) differs in certain essential features, particularly 

 in the possession of an inflated rhizoid. It may be a species of Phlycto- 

 chytrium. No zoospore discharge occurred in the form observed by 

 Sparrow on Olpidiopsis which was, in turn, parasitizing a species of 

 Achlya; hence, its generic disposition is doubtful. 



Rhizophydium vermicola Sparrow 



Aquatic Phycomycetes, p. 188, fig. 11 N. 1943 



(Fig. 17 N, p. 228) 



Sporangium sessile, spherical, urceolate after discharge, 1 5—20 [x in 

 diameter, with a broad apical papilla, wall thin, smooth, colorless; 

 endobiotic part consisting of a slender unbranched rhizoid ; zoospores 

 spherical, about 4-5 \x in diameter, with a colorless eccentric globule 

 and a long fiagellum, emerging apparently imbedded in a gelatinous 

 matrix or surrounded by a vesicle through a wide apical pore formed 

 upon the deliquescence of the papilla, soon assuming individual mo- 

 tility and swimming away; resting spore not observed. 



On Anguillula infected by other fungi, Sparrow (1933c: 519, pi. 49, 

 fig. 1), United States; Sparrow (1936a: 442, pi. 19, figs. 16-18), 

 Great Britain. 



