100 BOTANICAL GAZETTE [ AUGUST 
stage of their phylogenetic development, this group has, or once 
had, a complemental perithecial or pycnidial stage. A 
In 1886 Von Tafel™ carried on some investigations with 
Gleosporium nervisequum (Fckl.) Sacc., which he suspected from 
morphological evidence to possess an organic relationship with 
a pycnidial form, Discula platani (Pk.) Sacc. Owing to the fact 
that the pycnidial form was always associated with the Glceo- 
sporium form on the leaves, he was led to suppose that the 
mycelium passed through the petioles to the branches and there 
formed the pycnidia whose conidia developed in turn the Glceo- 
sporium. He was unable, however, to establish the connection 
by cultures, and the question still remained an open one. In 
continuing the investigations there was a suggested connection 
of the Discula with an ascigerous form of the genus Fenestella. 
The apparent connection of this form with a second pycnidial 
form as well as witha form resembling Acrostalegma, tended 
to disprove rather than to establish the connection with the 
Glceosporium. 
In connection with the study of Gleosporium fructigenum 
Berk., Miss Southworth * notes the finding of a perithecium con- 
taining two asci on the apple from which the Gloeosporium Was 
obtained, but the material, owing to contamination, could not 
be further examined. While the association of the two forms 
on the same host is interesting, very little value can be given ” a 
the incident in establishing a connection between them, for, 
she says, the apple became contaminated and it is quite poss! ie 
to account for the presence of the ascigerous form in that way 
Suggested connections are found in Saccardo’s Sylloge 0 
species of Gloeosporium with ascigerous stages. Gnomoniella? 
circinata® on the leaves of Ribes is noted in connection with 
Gleosporium ribis and Gnomoniella fimbriata has been found asso” 
ciated with Gleosporium carpini on the leaves of Hedera 
In a large number of artificial cultures of Gleosporium fruch- o 
™ Bot. Zeit. 44: 284. 1886. , = 
5 Dept. Ag. Rept. Washington 348. 1887. 
*6Sacc. Syll. Fung. 1: 416-419. 
