146 



FUNGI. 



Fig. 85.— Germinating pseudospore of 

 Puccinia Molinice. (Tulasne.) 



pears. The form of the latter is at first globular, then ellipsoid, 

 and more or less curved. All these phases of vegetation are 

 accomplished in less than twelve hours, and if the spore is 



mature and ready for germina- 

 tion, it is sufficient to provoke it 

 by keeping the pseudospores in a 

 humid atmosphere. During this 

 process the two cells do not sepa- 

 rate, nor does one commence ger- 

 mination before the other, but 

 both simultaneously. When the 

 sporules are produced, the proto- 

 spore, somewhat analogous to a 

 prothallus, has performed its 

 functions and decays. Towards 

 the time of the falling of the 

 sporules they are nearly all 

 divided into four unequal cells 

 by transverse and parallel septa. 

 These sporules in time produce, from any point on their surface, 

 a filament, which reproduces a new sporule, resembling the first, 



but generally smaller. This 

 sporule of the second genera- 

 tion ordinarily detaches itself 

 from its support before germi- 

 nating. 



The pseudospores of TripJirag- 

 rnium ulmaria have been seen in 

 April germinating on old leaves 

 of the meadowsweet which sur- 

 vived the winter, whilst at the 

 same time new tufts of the spores 

 were being developed on the 

 leaves of the year. These fruits 

 of the spring vegetation would 

 not germinate the same year. 

 Each cell in germination emits a long cylindrical filament, con- 



Fig. 86.— Germinating pseudospore of 

 Triphraymium ulmaria. (Tulasne.) 



