- 1900] BOTRYTIS AND SCLEROTINIA 401 
conidia of Botrytis cinerea before becoming mature. This 
may have been due to the coming on of winter before the scle- 
rotia were fully formed; at any rate the fungus was able to 
develop sclerotia and conidia in the usual manner, as shown 
in cultures and the moist chamber. It is believed that this 
disease was caused solely and primarily by Botrytis cinerea, in 
this case a true parasite. Cultures and observations showed 
throughout the same characteristics as found in Botrytis in con- 
nection with the lettuce disease and there is no reason to sup- 
pose that any other species was involved. This interesting 
disease upon the linden appears to be an entirely new one, and 
is the first of this class to be reported upon a woody plant. Its 
Similarity, however, to some of the other stem rots herein 
described is apparent. 
BOTRYTIS ON ROSE TWIGS. 
Some twigs of hothouse roses were obtained in Munich by 
the writer, which were affected by a dying away of the tips, the 
disease gradually extending down the stem. The extreme tips 
were entirely dead and covered with a Botrytis growth. Further 
down the stems were turning black and dying, but no Botrytis 
Was visible. Sections showed that the interior of affected parts 
of the stem was full of filaments. In the worst affected parts 
the whole tissue was destroyed and Botrytis conidiophores were 
towing out through the surface. In the less affected parts it 
was found that the disease advanced by large filaments which 
stew at first through the area of bast fibers, entirely disorganiz- 
ing this tissue before the rest was at all affected. Later the 
Whole stem became included. Figs. 46 and 47 show cross and 
horizontal sections of affected twigs with the filaments among 
the bast fibers. It appeared in this case, as in several others 
already described, that the most actively parasitic filaments 
Which attack new tissue bear no conidia, the latter of Saeeencs 
later on the older parts. The species was the usual cinerea put 
Was especially luxuriant, bearing large, many-branched conidia 
Phores. No sclerotia were found upon the limited material at 
