576 



COMPARATIVE MORPHOLOGY OF FUNGI 



forms a naked, dusty telium whose spores are mostly thin walled and 

 colorless, clinging to the stipe and germinating directly (forma persistens). 

 In the fall is formed a compact cushion in which the fungus winters over 



Fig. 387. — 1. Botryorhiza Hippocrateae, section of mature and young telium. 2. 

 Uromyces striatus; 3. Puccinia graminis. (1 X 330; 2, 3 X 300; 1 after Olive, 1918; 2, 3, 

 after Sappin-Trouffy, 1896.) 



and whose spores, thick walled and yellow brown, falling easily from the 

 stipe, can germinate only after a winter's rest (forma fragilipes) . 



In Gymnosporangium the number of daughter cells is generally two; 

 in Phragmidium (Fig. 388, 1 to 4), it may reach twelve. In both genera, 



