436 



BOTANY 



PART II 



body of 

 well 



the dead fly which has been killed by the fungus. This is particularly 

 when the dead fly is adhering to the glass of a window. 



3. Basidiobolaceae( 60 ). 

 Basidiobolus ranarum, a sapro- 

 phytic fungus growing on the 

 excrement of Frogs, must be 

 separated from the preceding 

 group. Each of the cells of its 

 septate mycelium contains one 

 large nucleus. Theconidia, which 

 arise singly on the ends of the 

 conidiophores and are abjected 

 when ripe, are uninucleate. The 

 mode of origin of the zygospores 

 is peculiar. Two adjoining cells 



FIG. 379. Mucor Mucedo. Different stages in the 

 formation and germination of the zygospore. 

 1, Two conjugating branches in contact ; 2, 

 septation of the conjugating cells (a) from the 

 suspensors (6) ; 3, more advanced stage, the 

 conjugating cells (a) are still distinct from one 

 another : the warty thickenings of their walls 

 have commenced to form ; 4, ripe zygospore (fc) 

 between the suspensors (a); 5, germinating 

 zygospore with a germ-tube bearing a sporan- 

 gium. (1-4 x 225, 5 x circa 60, from v. TAVEL, 

 Pilze. After BREFELD.) 



FIG. 380. Empusa muscae. A, Hypha 

 from the body of a fly. B, Young 

 conidiophore arising from the 

 mycelium and projecting from the 

 body of the insect. C, Formation 

 of the conidium into which the 

 numerous nuclei have passed from 

 the conidiophore. (x 450. After 

 OLIVE.) 



conjugate after they have put out beak-shaped processes which are cut off as 

 transitory cells. In the zygospore the two sexual nuclei give rise to four, of which 

 two disorganise while the other two fuse. Both in this procedure and in the 

 nuclear structure there are evident resemblances to the Conjugatae. 



CLASS XIV 



Eurayeetes ( 1( 51) 2 ' 61 ~ 86 ) 



When the Phycomycetes are excluded there remain two great 

 groups of Fungi, the Ascomycetes and the Basidiomycetes, regarding 



