52 MICROBES, FERMENTS, AND MOULDS. 
germinate wherever the conditions of heat and moisture 
are favourable, even on a healthy skin, or where it is 
only irritated by a simple scratch. 
Ringworm, <Achorion Schenlenii, the fungus 
which produces this disease on the parts of the 
skin covered by hair, belongs to the same family as 
oidium. Its mycelium produces hyphe, bearing 
chaplets of spores, as in the Mucorinez, but there is 
no true sporangium. 
Fig. 24.—Achorton Schenlenii, fungus of ringworm (x 400 diam ): a, spores; b, chains 
of spores; c, mycelium. 
They are found in abundance in spots of ringworm, 
amidst the sulphur-coloured substance which carpets 
them. If a morsel of this substance is dissolved in 
ammonia, the fungus is detached, and may be observed 
under the microscope, especially if care has been taken 
to stain it brown by an aqueous solution of iodine 
(Fig. 24). 
