336 



FUNGI 



its formation either, by their simple fusion, themselves constitute the 

 zygosperm, or this body is the direct offspring (daughter-cell) of the 

 union. The spores are produced either in terminal sporanges or singly 

 at the apex of a sporophore, or again serially in like fashion to the last. 

 In a considerable number of cases the zygosperms are unknown, and it 



FIG. 293. B, Phycomyces nitens Kze. Plant grown on decoction of plums ; mycele, ;//, spo- 

 rophore, g. A,~ C, and Z>, Mucor Mucedo L. A, sporange in optical longitudinal section. 

 C, zygosperm (z) borne on suspensors. , germ-tube ; g> sporange. D, conjugation. 

 a, a, gametes ; b, b, suspensors. (B slightly, A, C, and D more highly magnified.) (After 

 Brefeld.) 



may be assumed, on the weighty authority of de Bary, that in certain of 

 these they do not occur, since industrious observation has failed to dis- 

 cover them. They are known, in fact, only in nineteen species, though 

 future research may bring a fair number more to light. Where they have 

 been observed the life-history proceeds as follows. The germinating 



