PROTOZOA 7 
Cuass II. Myxomycetes. 
The Myxonycetes differ from the Proteomyxa in their 
spores being always coated (chlamydospores), and in the fact 
chat these are formed in definite cysts (Fig. 1, B), sometimes 
supported on columns, or in naked groups called sori. They 
Gale 
A. Plasmodium of Didymium leucopus (after Cienkowski). x 350. 
B. Spore cyst of Arcyria incarnata (after De. Bary). 
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 live 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 
