144 



FUNGI. 



end of its vegetation. The two forms of spores in this genus 

 are constantly found on the same leaf, and in the same pulvinule, 

 but generally the pulverulent spores abound at the commence- 

 ment of the summer. The reniform sporules begin to germinate 

 in a great number as soon as they are free ; some few extend a 



Fig. 82.— Germinating pseudospores of 

 (6) Coleosporium Sonchi; (a s) secondary 

 spores, or sporules (Tulasne). 



Fig. 83.— Germinating pseudospore (b) of 

 Melampsora betulina (Tulasne). 



filament which remains simple and uniform, but more commonly 

 it forms at its extremity a second sporule. If this does not 

 become isolated, to play an independent life, the filament is 

 continued, and new vesicles are repeated many times. 



In Melampsora the summer spores are of the Lecytliea type, 

 and were included in that genus till their relation with Melamp- 

 sora was clearly made out. The winter spores are in solid 

 pulvinules, and their fructification takes place towards the end 

 of winter or in the spring. This phenomenon consists in the 



