22, THE JOURNAL OF BOTANY 
The gooseberry Botrytis has the smallest spores of all that have 
come under my observation. The spores of the wea disease, studied 
by Marshall Ward, attained a size of 20-25p x 15p. Those of 
celium with abundant orceuy of attachment. These have been 
described by De Bary (1) and more recent celine. The tip of a 
filament sends out several swollen and somewhat ungainly hyphe, 
the ends of which are pressed against the glass with which they 
come in contact. There then follows a co onfused branching and 
clumps, the cells become very thick-walled and dark in colour, and 
finally there is formed a compact tissue, which resembles the outer 
layer of a sclerotium. I have not yet succeeded in inducing an 
further development of the clumps. De Bary says they have 
nothing to do with sclerotium formation 
had an opportunity of comparing the formation of these 
clumps with somewhat similar black bodies that I obtained from a 
culture of the spores of Monilia, also a sclerotium-forming fungus. 
drop of gelatine the mycelium from Monilia cinerea spores also 
platisy itself up at intervals into clumps called by Woronin ‘“ horn- 
gans,” which did not function as organs of attachment. They 
were ey rich in contents, the rest of the filament being left 
almost empty; then followed the branching into smaller hyphe 
with thick dark walls, and a black-looking bo ie was formed, which 
Woronin (6) considers to be of sclerotic natur 
A culture of spores from the peony Banya gave very different 
results. There were no organs of attachment on the mycelium. A 
thick coil of loose hyphz formed above the gelatine, possibly an 
incipient sclerotium that stopped short for lack of nour oe ent. In 
addition certain filaments branched copiously, and grew out into a 
funnel-shaped body, something like a ‘ horn of plenty,” ee finally 
into an elongate, dark-coloured, wedge-shaped stalk of parallel 
branching filaments that curved up from the cover slip, the 
branching end being always next the glass. At a later stage 
spomioshorss of Botrytis developed all over these stalks, which con- 
ey opinion that these are reserve bodies. 
oh st-tube culture of the same spores a thick felt of white 
rin formed over the surface of the gelatine. Round the 
of the elongate stalks that were developed in the hanging drop. 
The growth of this Botrytis is so distinctive that it must retain es 
spec otrytis Paonia Mass. The other fo rms I hav 
biological races have seein evolved, so that the gies ; is eiioed 
generally to one genus or species of plants in a given locality. 
