352 AQUATIC PHYCOMYCETES 



first undoubted instance of their occurrence in the Dentigera group 

 (see Phlyctochytrium quadricorne, p. 343). 



Observations of great biological interest were made by Dangeard on 

 the reaction of the host to this parasite (see "Parasitism," p. 118). 



A sequence of development similar to that in Chytridium lagenaria 

 was observed in this species. After infection the endobiotic system 

 reached nearly its full size and complexity before growth of the epibiotic 

 part — the case of the infecting zoospore — was initiated. 



? Phlyctochytrium pandorinae (Wille) de Wildeman 

 Bull. Soc. Roy. Bot. Belg. (Mem.), 35: 47. 1896 



Chytridium (Phlyctidium) pandorinae Wille, Bih. Kgl. Svensk. Vetensk.- 

 Ak. Handl., 8, Afd. 1, No. 18: 46, pi. 2, fig. 86. 1884. 



Rhizidium pandorinae (Wille) Fischer, Rabenhorst. Kryptogamen-FL, 1 

 (4): 109. 1892. 



Sporangium partly imbedded in the gelatinous sheath of the host 

 colony, subspherical, with an apical wartlike protuberance and an 

 apical or subapical elevated discharge pore; subsporangial part tubular, 

 inflated in the mid-region, terminating on the surface of the host cell 

 wall ; zoospores and resting spore not observed. 



On Pandorina morum, Uruguay. 



? Phlyctochytrium spirogyrae de Wildeman 

 Ann. Soc. Beige Micro. (Mem.), 20: 48. 1896 



Rhiz.idiomyees spirogyrae de Wildeman, Ann. Soc. Beige Micro. (Mem.), 

 19: 111, pi. 4, figs. 14-22. 1895. 



Sporangium sessile, spherical or slightly ovoid, wall thin, smooth, 

 colorless; rhizoids of limited extent, branching within the zygospore of 

 the host, arising from a fairly large spherical or ovoidal endobiotic 

 subsporangial apophysis which rests either on the wall of the zygospore 

 or in the contents ; zoospores not observed, presumably escaping through 

 a broad apical slightly protruding pore, the sporangium proliferating; 

 resting spore endobiotic, lodged either in the zygospore or the game- 

 tangium, spherical or ovoid, with a thickened (rough?) wall, germination 

 not observed. 



