204 YEASTS AND MOLDS 
the characteristics inherent in the parent cells. When asexual spore is 
formed on a non-septate hyphe, it is termed a zygospore; if on a sep- 
tate hyphe it is an ascospore. Zygospores are formed by the union of 
two terminal cells on adjacent hyphe. The ascospore is formed by the 
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Fre. 48.—Mucor Mucedo. Formation of the Zygospores. (After Brefeld.) 
1, two hyphe in terminal contact; 2, articulation into gamete a and suspensor b, 3, fusion of 
the gametes a; the membrane thickens; 4, ripe zygospore b supported by the suspensors aa; 
5, germination of the zygospore to a sporangium stem. Mag. about 60, 
union of adjacent cells. In this mass are formed the asci which hold the 
spores. Most of the spores formed by molds are asexual being formed 
mostly at the ends of the fertile hyphz from typical fruiting bodies. 
Classification. The molds are thread fungi and it is often difficult to 
draw the line between them and some other classes of fungi. Oidium 
