534 AQUATIC PHYCOMYCETES 



In none of the numerous specimens was the rhizoid ever observed to 

 penetrate the algal cell. Indeed, the whole aspect of the organism was 

 animal-like rather than fungoid in character. 



? Chytridium muricatum Scherffel 

 Arch. Protistenk., 54: 216, pi. 10, fig. 89. 1926 



Sporangium sessile, between spines of the host, broadly ovoid, with 

 a rounded base, somewhat higher than broad (15 by 12 u.), thick-walled, 

 the outer surface fairly densely beset with scattered moderately thick 

 conical spines 3 \i long; with a sharply defined smooth broad apical 

 opening which probably resulted from the dehiscence of an operculum; 

 other characters unknown. 



On the zygote of Stawastrum dejectum var. debaryanum, Hungary. 



This incompletely known form is interesting because of the sculp- 

 turing of the wall, in which character it resembles Rhizophydium ver- 

 rucosum. It is not clear, however, whether the structure described is a 

 sporangium or a germinated resting spore. Rhizoids and an operculum 

 were probably formed but were not observed. 



? Chytridium pedicellatum de Wildeman 

 C. R. Soc. Roy. Bot. Belg. (Bull.), 30: 170, fig. 1. 1891 

 Sporangium shaped like that of Rhizophydium mammillatum; en- 

 dobiotic part consisting of a small knob; otherwise unknown. 

 Substratum (?), Belgium (?). 

 Possibly belonging in Phlyctidium. 



? Chytridium volvocinum Braun 



Monatsber. Berlin Akad.. 1856: 588 



Rhizophydium volvocinum (Braun) Fischer, Rabenhorst. Kryptogamen-Fl., 

 1 (4): 104. 1892. 



Sporangium pyriform or flasklike, resting on a short narrow base; 

 apparently without rhizoids; zoospores and resting spore not observed. 



On Volvox globator, coll. Cohn, Germany. 



Described in Fischer as Rhizophydium (Phlyctidium) volvocinum and 

 in Minden as R. volvocinum (Braun) Fischer. 



