PROTOZOA 



Class II. Myxomycetes. 



The Myxomycetes differ from the Proteomyxa in their 

 spores being always coated (chlamydospores), and in the fact 

 that these are formed in definite cysts (Fig. 1, B), sometimes 

 supported on columns, or in naked groups called sori. They 



Pw. 1. 



A. Plasmodium of Didymium leucopus (after Cienkowski). 



B. Spore cyst of Arcyria incamata (after De Bary). 



X 350. 



differ from, all other Protozoa in being rarely aquatic ; they 

 usually live in the air, in damp places. Their plasmodia may 

 attain a great size, several square inches in area, and form the 

 largest masses of undifferentiated protoplasm to be met with. 

 They hve on organic particles ; they are often of brilliant 

 colour. 



The life-history of most of the Myxomycetes is a repeti- 

 tion of that of Protomyxa : in some the flagellula phase is 

 omitted, the chlamydospore giving rise directly to an amoeboid 



