SEAVER AND HORNE: STUDIES IN SCLEROTINIA 205 
yellowish sclerotia were beginning to form on some of the geranium 
rootstocks, but no distinct sclerotia were observed on any of these 
or older potato cultures. Although Botrytis spores appeared in all 
of these, they were much more abundant on the rootstocks than 
on the potato plugs. On the rootstocks the spores were so abun- 
dant as to be evident to the naked eye, and the masses were very 
similar to those obtained on infected rootstocks brought from the 
field and placed in moist chambers, as shown in the accompanying 
plate. Check experiments were kept and these failed to show any 
evidence of the Botrytis. 
The infected rootstocks will be kept with the hope of securing 
mature apothecia, but these will probably not appear until spring, 
as is the case in nature, and it is too soon to predict what the result 
of this study will be. However, the production of Botrytis 
directly from the ascospores of the Sclerotinia confirms field obser- 
vations on the connection of the two fungi. The production of 
apothecia would add still more interest to the investigation. 
Sclerotinia (Stromatinia) Geranii sp. nov. 
Conidial stage (Botrytis) occurring on the roots and rootlets of 
the host, being especially abundant when left in moist chamber 
for a few days and even developing on the outside of the apothecia, 
usually appearing in tufts and often springing from minute sclero- 
tium-like bodies, although the latter are not always present, dark 
brown in mass at maturity; conidiophores reaching a length of I 
m. or more and a diameter of 10-15 р, pale brown, sparingly 
septate and branched, the conidia borne in rather large masses 
like bunches of grapes; conidia subglobose or pyriform, the small 
end representing the point of attachment, reaching a diameter of 
IO u or rarely as large as 12 и, slightly longer than broad, at first 
smooth, becoming quite strongly roughened, pale brown with 
transmitted light. 
Apothecia springing from the partially decayed rootstocks in 
clusters of variable numbers, stipitate, shallow-cupshaped or 
subdiscoid, reaching a diameter of 1 cm. or rarely larger, pale- 
brown externally; hymenium concave or nearly plane, a little 
darker than the outside of the apothecium; stem reaching a diame- 
ter of 2 mm. and often reaching a length ОЁ several cm., though 
often short and occasionally almost wanting, the length varying 
with the depth to which the rootstocks of the host are buried; asci 
cylindric or subcylindric, 8-spored, reaching a length of 120-140 u 
