3 i6 TEXT-BOOK OF FUNGI 



basidia transversely septate, 4-spored, differentiated from 

 the substance of the sporophore, and forming a continuous 

 hymenium. Auricular ieae. 



Obligate parasites; often heteroecious. The teleuto- 

 spores on germination produce a transversely septate 

 basidium (promycelium) which bears four spores. Aecidia 

 and uredospores often present. Uredineae. 



Angiocarpous. Sporophore subglobose, supported on a 

 slender stem ; basidia transversely septate, bearing four 

 spores. Pilacreae. 



Basidia with septa arranged obliquely to the long axis, 

 produced in chains. Sirobasidieae. 



Angiocarpous. Sporophore more or less gelatinous; 

 basidia divided by two septa crossing at right angles, each 

 cell growing out into a long sterigma and bearing a spore 

 at its apex. Tremelleae. 



Basidia as in Tremellaceae, but the fruit is angio- 

 carpous. Hyalorieae. 



Ustilagineae 



All the members of the present group are parasites, 

 mostly met with in the aerial portions of flowering plants, 

 although some few develop in mosses, hepatics, etc. In 

 many instances the spores are produced in the ovary of 

 the host, where they often form a black pulverulent mass 

 when mature, as in the 'smut' or 'bunt' of oats and 

 wheat. In some instances the spores are formed in the 

 anthers, in others on the leaves, whereas in the case of 

 maize or Indian corn, the smut often forms irregular 



