78 



INTRODUCTION TO CRYPTOGAMIC BOTANY. 



Carmichael, was the first to discover, do really perform the 

 office of fecundation. Amongst Fungi, in many cases, the 

 secondary form germinates equally with the primary, but then 

 there is sometimes added a thu'd, or even a fourth or fifth.* 

 (Fig. 20). Where there are true spermatozoids, there is often 

 more than' one form of reproductive granules, though both, 

 possibly, may not receive impregnation. 



Fig. 20. 

 Sphcerotheca Castagnei, Lev. 



a. Threads of inycelmm, with some of the joints turned into pyc- 

 nidia. 



b. Granules germinating within ordinary moniliform cells. 



c. Pycnidium and its contained stylospores. 



d. Ascus, with sporidia. Berk, in Tr. of Hort. Soc, vol. ix. p. 68, 



62. The question now arises, into what principal groups are 

 these bodies naturally divisible. Now, though the matter is 

 not without exception, it must at once strike any one who 

 observes them collectively, that certain differences exist, order- 



* In Erysiphe, there are no less than five different forms of fruit ; the 

 moniliform threads on the mycelium ; the asci in the sporangia ; the 

 larger stylospores in other sporangia ; the smaller stylosjiores in the 

 pycnidia ; and the separate sporules sometimes formed in the joints of 

 the necklaces. 



