1900 BOTRYTIS AND SCLEROTINIA 397 
The Botrytis in this case was not a typical cinerea, having a low, 
dense manner of growth which persisted in cultures for many 
generations. The conidiophores were also short and stout ( figs. 
5, 6), and the conidia small and rather pointed as in 12, plate 1. 
No sclerotia were found. Massee (7) ascribes the onion rot to 
Sclerotinia bulborum Wak. and figures (7a) a Botrytis apparently 
identical with B. cznerea, and a Peziza form showing no apparent 
distinction from Sclerotinia Libertiana. Sclerotinia (Pesiza) 
bulborum was described by Wakker (3) as the cause of a hya- 
cinth disease, a very interesting case in connection with the 
lettuce disease on account of its very similar mode of spreading 
and existence in the soil. No Botrytis stage was found, and 
Oudemans (10) states that none occurs. /ig. 38 is copied from 
the latter. From all appearances it is doubtful whether the form 
described by Massee is the same as that of Wakker, and certainly 
the connection of the Botrytis and Sclerotinia forms, and their 
distinctness from the ordinary species, need further demon- 
stration. An endless amount of confusion of these forms already 
exists on account of the multiplication of species for every new 
host. 
III. Diseases caused by Botrytis alone. 
No fungus is more common on dead or dying plant tissue 
than the common form of Botrytis. Not only is it abundant as 
@ saprophyte, but cases often occur where it is a true parasite. 
Accounts of such cases are innumerable in botanical literature, 
but only a few can be briefly cited here. The species of Botrytis 
concerned has many different names, as has already appeared. 
In general it may be said that in Europe the ordinary form is 
referred to B. cinerea Pers., while in America the equally abun- 
dant species is usually called B. vulgaris Fr. These forms have 
been often regarded as identical, and the writer is able to state 
definitely that such is the case. Material from various parts of 
America and Europe has been carefully compared, both by 
€xamination and in cultures, from which it has been clearly 
Shown that the forms are completely identical. On the basis of 
Priority cinerea should be the specific name adopted, though, as 
