70 BOTANICAL GAZETTE [ AUGUST 
The greater number of diseases described as anthracnoses 
have fallen under the genera Gleeosporium and Colletotrichum. 
These are characterized as fungi appearing at the time of fruit- 
ing in subcutaneous or subepidermal acervuli, which at maturity : 
t 
become partly erumpent. The conidia are borne upon basidia \ 
arising from a more or less definite basal stroma. At maturity 
the conidia issue upon the surface of the host in a conglutinated 
mass, usually of a roseate hue. ‘The acervuli frequently occur 
upon the host in quite regular concentric circles. The char- 
acters of the genus Colletotrichum agree in the main with those 
of Gleeosporium, with the exception of the presence of sete in 
the former genus, which is not an absolute line of distinction, 
however, since Glceosporium develops occasional sete, and the 
sete in Colletotrichum sometimes become so reduced in number 
that the pustules cannot be distinguished from those of Glao- 
sporium. 
The large number of species of these genera, which closely 
resemble each other in structural characters, and the fact that 
the anthracnose of one host will adapt itself to others, indicate 
their close relationship, and suggest that many more species 
have been established than should be maintained. Moreover, 
Species are often established, especially among the imperfect 
fungi, from characters which vary with the conditions of growth. 
It is well known that these fungi, though parasitic, adapt 
themselves quite readily to saprophytic conditions, and may 
grown in various nutrient media. In artificial cultures, distinct 
Species present more or less marked growth characters, and 1B 
with the aid of these characters that I have attempted, to relate, 
or distinguish, the species of some of this group of fungi, i) 
the characters peculiar to each are sufficiently constant and we 
marked to be of taxonomic value. 
In studying the characters, the ordinary dilution culture 
method has been employed, and the colonies photographed a 
Petri dishes. The fungus is then transferred to tubes of steril- 
ized nutrient media. Various media have been employed, but. 
sterilized bean stems have proven the most satisfactory for so 
a 
