HYP HOC HYTRl ALES 



761 



D 



E 



Fig. 56. Hyphochytrium 



A-B. Hyphochytrium catenoides Karling on decaying maize: A, portion of 

 thallus showing (lower right) formation of zoospores at orifice of discharge 

 tube, group of quiescent spores, sporangium with its discharge tube, and (at 

 top) empty segments from which contents have migrated; B, anteriorly uni- 

 flagellate zoospore. C-E. Hyphochytrium hydrodictii Valkanov in Hydrodictyon: 

 C, parts of thalli in alga, showing epibiotic cysts of zoospore and primary and 

 secondary swellings; D, resting spore; E, anteriorly uniflagellate zoospore. 



(A-B, Karling, 1939b; C-E, Valkanov, 1929b) 



Hyphochytrium infestans Zopf 



Nova Acta Acad. Leop.-Carol., 47: 187, pi. 18, figs. 13-20. 1884 



(Fig. 55 H-I, p. 752) 



Hyphophagus infestans (Zopf) Minden, Kryptogamenfl. Mark Brandenburg, 

 5:420. 1911 (1915). 



Vegetative system ramifying throughout the substratum, richly 

 branched; sporangium, when intercalary fusiform or ovoid, when ter- 

 minal spherical with a small apiculus, wall smooth, stout, colorless, col- 



