CHYTRIDIALES 283 



Dangeard observed that changes in the host contents quickly oc- 

 curred after infection by the fungus. The olive-colored plasma was 

 reduced to reddish granules and the cellulose wall lost its structure 

 and expanded. The swarmers of the alga were not attacked. 



The British material differed from Dangeard's species in having 

 fewer and larger (3 \x in diameter rather than 1.5 jjl) zoospores formed 

 in the sporangium. Certain of the sporangia appeared to show internal 

 proliferation, but owing to their small size this could not be deter- 

 mined with absolute certainty. 



Perhaps only doubtfully distinct from Rhizophydium braunL 



Rhizophydium pseudodistomum Scherffel 



Abstracts of Communications, V Inter. Bot. Congress, Cambridge, 1930: 222; 

 Arch. Protistenk., 73: 140, pi. 9, fig. 2 a-b. 1931 



Sporangium sessile, distinctly pyriform, with a broad convex base 

 and a prominent apiculus, 16-20fj. high by 13-18 \x in diameter, wall 

 thin, smooth, colorless; rhizoids well developed, branched; zoospores 

 not observed, apparently emerging through a discharge tube 2 [x long 

 by 5 (j. in diameter which forms subapically on the sporangium, the 

 apiculus becoming slightly lateral as a consequence; resting spore not 

 observed. 



Parasitic on Oocystis solitaria var. wittrockiana, Hungary. 



The parasite soon destroyed the contents of the host cell and re- 

 duced them to a reddish-brown mass. 



The unnamed fungus found on Protoderma from North Africa by 

 Sparrow (1938a: 147, fig. 2a) with a pyriform sporangium bearing 

 two prominent apical papillae may possibly be referable to this species. 

 The endobiotic system consisted, so far as could be observed, of a 

 short peglike structure, but whether this gave rise distally tc branches 

 was not determined. 



Rhizophydium granulosporum Scherffel 



Arch. Protistenk., 53: 44, pi. 2, figs. 81-86. 1925 

 (Fig. 17P-Q, p. 228) 



Sporangium sessile, broadly pyriform, with a broad apex, l-\A\x 



