PARASITIC FUNGI AND MOULDS. 13 
In this case, the spores or seeds are developed in the 
cells of the mycelium itself. 
This latter mode of reproduction also occurs in the 
higher fungi, which therefore possess two modes of 
reproduction and two kinds of spores: exogenous 
spores, which are externally developed, as we see on 
the hymenium (Fig. 2); and endogenous or internal 
spores, which are developed in 
the mycelium (Fig. 4). These 
spores not only differ in the 
site of their origin, but also in 
their form, size, structure, and 
in the end they fulfil in the 
reproduction of the fungus. 
There are in many cases several 
forms of exogenous spores. i ce 
Classification of F Ungt.— he ce es Agaricus 
The nature of the spores, and 
the very varied mode of reproduction, have led to 
the classification of fungi in a certain number of 
groups, of which we need only cite the most im- 
portant, and those which chiefly concern our present 
point of view. Such are— 
1. The Hymenomycetes. 
2. The Basidiomycetes. 
3. The Ascomycetes. 
4. The Oomycetes. 
Each of these groups is subdivided into several 
sections or families. Ferments and Schizomycetes, or 
