141 
Now with a few exceptions the process of microsporogeny has: 
not been found in cultures less than one month old; and this 
holds true of living hosts ey yeti been experimentally i inocu- 
lated with the fungus, and, ar as can be judged, of — 
naturally infected, although the! latter obviously cannot be in 
cluded with the same degree of certaint 
If — formed conidia be placed wnder favourable Hamme 
in a nutrient medium, such as a hanging drop of potato agar or 
reece spfasinitlottiy one hundred per cent. of the ie tn 
minate, giving rise to normal vegetative mycelium. If 
one half of the spores do not germinate; and of the remainder 
many more give rise to microconidia or hyphae of limited growth 
bearing sterigmata than produce germ tubes originating the 
usual vegetative mycelium; and. with ae age this dis- 
parity becomes more pronounced. It might be criticised that 
the latter does not result from age but from physiological star- 
formalin of microconidia by the vosetative yphae and the 
conidiophores, for, as Lindner ee only old mycelium shows 
this iis of sporogeny. What has been described of cultures of 
the fungus upon artificial or ae ol ges is equally true of the 
Botrytis developing in nature upon the living host. 
The facts stated above are most anil and mataiely inter- 
pretable by the hypothesis that microsporogeny is a normal an nd 
discrete developmental phase in the life cycle of Botrytis 
cinerea, and that it is controlled primarily ily by an age factor. If 
I an 
attacked by Botrytis are in nearly all cases of a soft herbaceous 
nature, and owing to the enzymic pintien of the fungus, are very 
s fe a Shae paper went to press very many more strains of Botryits 
e been examined, and it has been found that the case a ane tt 74 
althou “e phaser a true ecb picture, is not true in cases. 
prod tt f microconidia by di mination of the Polyactis st pe 
appears to be very largely a strain character; certain strams mt 
sporogenating chiefly in this way, > ils others produce these minute spores 
elium 
principally from the old myce 
