118 
to the influence of centrifugalisation, but much more resistant 
to desiccation and the action of chemical fumes. When the 
resting period of the spores has been eliminated their resistant 
quality is very greatly reduced. 
Chlamydospores.—If the fungus be grown on a very stiff agar 
medium (e.g., 5 per cent. potato agar), the colonies seldom 
attain a diameter of more than two centimetres, and after ten 
or twelve days’ growth the mycelium breaks up into chlamydo- 
spores. (Text Figs. 5, 6.) 
5. Chlamyd > 
. Yeospores from a culture on 4 per cent 
oy Pa ydospores five hours after is Se aaah seb. 
The aa Ase ai fifteen hours after germination. 
subject hey oe were from an old culture on prune gelatine. They were 
three hours Wink eRe ge al psin in a faintly alkaline medium for 
ina Van tan on a in a hanging drop of lavender extract 
(All figs. Swift obj. x Il and left at room temperature, 
The 
5 cells ees, uregularly swollen, spindle-shaped, barrel- 
Very irregularly, and the; Their walls become thickened, often 
eli aa Jy, a elr colour changes to brown. The My- 
um lod 
: to thirt . f the 
thick-w >» thirty days. As in the case of th 
alled brown conidia, this resting period may be elim 
In resistant ualit t the action of gastric or pancreatic Juice 
approximat ; ity to adverse conditions the chlamydospores 
: © to the thick-walled brown conidia. 
ormation ac ; 
abundant on Rs tenidia.—Pyenidial formation, although 
ased plants, ig only sparingly and inconstantly 
