140 BETTS = THE FUNGI OF THE BEE-HIVE. 
The thick-walled brown hyphae dre not affected by heating in 
sulphuric acid. Cold sulphuric acid dissolves the thin-walled yellow 
hyphae, and the liquid in their vicinity is coloured a rich magenta. 
The fungus appears to be specialised for growth in the hive, 
as attempts to obtain pure cultures on artificial media have. hitherto 
failed. It is interesting to note that the oidium-form grew well, 
and the ascus-form occasionally, in cultures heavily infected with 
Penicillium (which was present on the combs with the Gymnoascus). 
The fungus appears to prefer empty brood-cells to any other 
substratum in the hive, but has been found on the cappings of dead 
pupae; also in pollen-cells, mingled with Pericystis alvet. It has 
been met with in a healthy stock, but evidently flourishes best after 
the death of the bees. 
Fig. 6.—Gymnoascus setosus. Oidium-hypha and oidia. x 1 400 2 
Fig. 7.—Gymnoascus setosus. Conjugation of hyphae 
: From specime i 
with haematoxylin, x 1,400. Bey eer Biained 
