REPRODUCTION. 



617 



Turning now to the Fungi, we find that in the lowest 

 forms, the Zygomycetes, in which a sexual process has been 

 observed (Chytridiaceae, e.g. Polyphagus Etiglence ; the Muco- 

 rini ; the Entomophthoreae), it is in the form of conjugation 



Fig. 71 (after Strasburger). Two corpuscula of Juniperus virginiana in 

 process of fertilization, e endosperm, os oosphere. v vacuole of oosphere. 

 fp female pronucleus. mp male pronucleus. r rosette or neck of corpusculum. 

 n nucleus in dilated end of pollen-tube. 



with the production of a zygospore. The conjugation is in 

 nearly all cases of the kind described above in the Conjugatae; 

 that is, it consists in the coalescence of the protoplasmic con- 

 tents of two externally similar sexual reproductive organs. 

 Conjugation of planogametes is rare ; it has been described by 



