CHYTKIDIALES 101 



2. Sporangium lacking a lid and not proliforating 



fl. Mycelium of rather broad, cylindrical threads; sporan- 

 gia developed from fusiform enlargements of the 

 hyphae and separated by short cylindri(;al cells. 



3. Catenaria, p. 101 



h. Mycelium of extremely delicate branching strands, 

 developing globose or irregidar enlargements which 

 sometimes become septate into several cells; sporan- 

 gium developed from an entire eidargement or from 

 one of its cells; resting spores unknown. 



4. Cladochytrium, p. 102 

 B. Sporangia rarely formed, when present epibiotic and developing 



directly from the swarmspore; resting spores always present and 

 abundant. 



1. Resting spore globose to ellipsoidal, usually not flattened on 



one side; parasite resulting in discoloration or slight 

 thickening of the affected plant parts. 



5. Phy so derma, p. 103 



2. Resting spore globose, but usually flattened to concave on 



one side; considerable deformation of affected portions of 

 the host occurring. 



6. Urophlyctis, p. 107 



1. Amoebochytrium Zopf (1884: 181). 



Erected on the single species, A. rliizidioides Zopf, found in 

 slime of Chaetophora spp., but not in the cells, apparently known 

 only from the original collection. Sporangium developed either 

 from the spore or from an enlargement of the mycelium, flask- 

 shaped with a long neck, described as freeing amoeboid non- 

 ciliate spores. Resting spores unknown. It is possible that 

 ciliate spores occur under certain conditions of environment. 



2. NowakowskieUa Schroter (1892: 82). 



Two species are included, N. elegans (Nowakowski) Schroter 

 (Fig. 33) described from the slime of Chaetophora in Germany, 

 and N. ramosa Butler (1907: 137) seen in decaying wheat culms 

 in India. The former species has been found in America (Mat- 

 thews, 1928). 



3. Catenaria Sorokin {Ann. Sci. Nat. 6 ser. hot., 4: 67, 1876). 

 The genus includes the type species, C. anguillulae (Fig. 34) 



found in nematode and trematode worms, rotifer eggs, cysts of 

 infusoria and Nitella, and C. pygmaea Serbinow a doubtful 

 species in Moiigeotia. The most recent and complete discussion 

 of the genus is that of Butler {Ann. Botany, 42: 813, 1928). 



