EUTHALLEPHYTA EUMYCETES EUBASIDII 221 



PROTOBASIDIOMYCETES 



Parasitic or saprophytic plants; basidia with longitudinal or cross septa; 

 mycelium septate, branched, either in the interior of the plant as parasites or 

 ramifying the substratum; spores various. The following types occur: sper- 

 matia, aecidiospores, uredospores, teleutospores, and sporidia; the spermatia 

 are always accompanied by other spores, generally with the aecidiospores; the 

 aecidiospores are 1-celled and occur in cups; the uredospores are 1-celled, occur 

 in a powdery mass, and germinate immediately; teleutospores arise from the 

 same mycelium that produces the uredospores, one or more cells, on germina- 

 tion they produce a promycelium that bears the sporidia. This group contains 

 the following families : Endophyllaceae with a fungus parasitic on the leaves 

 of spurge, stonecrop and house-leek; Melampsoraceae including several important 

 economic fungi; Pucciniaceae containing a large number of genera; the Auri- 

 culariaceae, gelatinous fungi common on decaying wood. 



MELAMPSORACEAE 



Teleutosori forming incrustations on the surface of leaves ; uredosori 

 powdery; aecidia without pseudoperidium (Caeoma) or with well developed 



Fig. 60. Uredineae. Teleutospores of different 

 genera germinating. By germination originate the 

 promycelia which divide into cells, each of 

 which produces a conidium. 1. Uromyces Fabae x 

 460. 2. Triphragmium Ulmariae x 370. 3. Mel- 

 ampsora betulina x 370. 4. Phragmidium Rubi x 

 370. t Teleutospore; sp Conidium. After Tulasne. 



