BETTS ! THE FUNGI OF THE BEE-HIVE. 157 
cysts, and the probable life-history, have been dealt with else- 
where (4). 
Pericystis alvei is one of the most frequent of the bee-hive fungi, 
and is probably the species chiefly responsible for the white ‘‘ pollen- 
mould ’’ so well known to bee-keepers. 
O 
2S 6. O 
O 
Fig. 25.—Pericystis alvei. Cyst spores. x 1,400. 
It would be of interest to ascertain the distribution of this 
fungus; whether it is confined to the British Isles or is of world-wide 
occurrence. The type specimens were collected in North-western 
Surrey. 
_As far as could be ascertained by means of cultures on litmus 
media, no acid is produced by this species. 
Oospora favorum, Berkeley and Broome. 
_ The type specimen having disappeared from the Berkeley Her- 
barium, I was unable to make a direct comparison with it of my 
Fig. 26.—Oospora favorum. Conidia and torulose cells. x 1,400, 
