>l 



(iKXKRAL CHARACTKRS OK TIIK KUNG1 



5 



it may also become variously coloured. In the large majority of cases the 

 spore is enclosed by a double wall consisting of a delicate endospore and 

 an epispore which may be smooth or variously sculptured; it may develop 

 small projections and is then said to be waited or verrucose, or it may be 

 reticulate, exhibiting a number of more or less regular polygonal depressions 

 between which anastomosing ridges are present. 



Man_\- conidia and other thin walled fungal spores possess the power, 

 in suitable media, of budding or sprouting; giving rise, that is to say, 

 to new cells as simple lateral outgrowths which are soon nipped off. This 

 method of propagation is shown in the conidia of the yeasts, in some of 

 which it has wholly superseded the development of a mycelium. Asco- 

 spores are found to bud in the Exoascaceae, and basidiospores in the 

 Ustilaginales. 



Classification. The fungi are divided into three great groups according 

 to the septation of their mycelium, and the characters of their principal 

 spores. 



KUNGI 



vegetative mycelium 

 aseptate 



l'lIVCOMYCETES 



characteristic spores 

 endogenous, ascospores 



I 

 ASCOMVCETES 



vegetative mycelium 

 septate 



characteristic spores 

 exogenous, basidiospores 



I 

 BASIDIOMYCETI-'.S 



They may be further subdivided as follows: 



PHYCOMYCETES 



mycelium rudimentary 

 or obsolete 



Archimycetes 



sexual reproduction by 

 oospores ; asexual 

 spores often motile 



( him i .'. 



i. Saprolegniales 

 2. Peronosporales 



mycelium well 

 developed 



sexual reproduction by 



zygospores ; asexual 



spores non-motile 



Zygomycetes 

 i. Mucorales 

 2. Entomophthorales 



