1920] THAXTER— FUNGUS-PARASITES . ' ' 2X 





the disorganization of the mother cell walls. .The filament is 

 attached at the lower end, the wall of -which is at first thickened, 

 the thickening organizing a well developed and peculiar sucker-like 

 structure, which forms a definite organ of attachment. The walls 

 of the filament mother cells and spores are comparatively thin, 

 although well defined. As the title indicates, this type was regarded 

 by Hauptfleisch as unquestionably belonging to the Saprolegnia- 

 ceae, with a possible relationship to Aphanomyces; the mother 

 cells, despite the absence of any signs of antheridia or of zoospo- 

 rangia, being regarded as oogonia, and the contained spores as 

 oospores, a comparison being drawn between them and the seriate 

 oogonia, of Saprolegnia monilifera DeBary. The author's con- 

 ception of the type is summed up in his "kurze lateinische Diagnose 

 -fur diese neue Saprolegniaceae," which reads as follows: '.'Thallus 

 non racemosus. Una tantummodo ovospora in ovogonio nata, 

 quasi explens ovogonium. Ovosporae plurium nuclearium ob- 

 longae, 2-2 .6X7-10 /jl. Ovogonia terminalia semper simplici serie 

 adnexa, aliud alii, non transfusa. Sporangia incognita. Anther- 

 idia desunt." Saccardo in the Sylloge (14:446) places this type 

 among the Chytridiales, but neither author appears to recognize 

 the fact that it has any relationship to the Enterobryae, to which 

 it undoubtedly belongs. The only character which might separate 

 it from the type genus Enterobryus is found in the presence 

 of definitely differentiated spores, which replace, or succeed, the 

 terminally abjointed segments which are characteristic of all 

 the species of this genus; but whether this character should be 

 regarded as separating the two types generically, or as extending 

 our knowledge of the little known life cycle of the last mentioned 

 genus, it is not at present possible to decide. In the numerous 

 forms of Enterobryus which I have examined, none that have been 

 observed growing within the intestine of the host have shown a 

 development of well differentiated spores; although the terminally 

 abjointed segments may be more or less sporelike, according as 

 they are longer or shorter. It does not seem possible, however, to 

 homologize them closely with the spores of the form described by 

 Hauptfleisch, or with those of the new form described later. 

 It is nevertheless quite possible that, as in many cases among the 



