NEW SPECIES OF COLLETOTRICHUM 
AND PHOMA 
P. J. O’Gara 
A New Species of Colletotrichum on Clover 
During the course of my investigations in the Salt Lake Valley, 
I have found many clover fields in which the stems and petioles 
of red clover (Trifolium pratense L.) and alsike clover (Tri- 
folium hybridum L.) were infected with a Colletotrichum which 
does not agree in its characteristics with Colletotrichum Trifolii 
Bain. However, in many respects the characters of the disease 
are similar to those of Colletotrichum Trifolii as described by 
Bain and Essary.^ 
The clover plants seem to be most frequently attacked at or 
near the ground, although it has been noted that the attack may 
also occur just beneath a cluster of blossoms. As a rule, one’s 
attention is called to the sudden dying of a cluster of blossoms. 
The petioles and stipules are also attacked. 
Specimens of diseased plants were sent to Mrs. F. W. Patter- 
son, mycologist of the U. S. Department of Agriculture, at Wash- 
ington, D. C, and also to Professor S. M. Bain of the University 
of Tennessee. Reports from both sources indicate that the dis- 
ease of red clover and alsike clover as found in the Salt Lake 
Valley is not caused by Colletotrichum Trifolii but by a hereto- 
fore undescribed species. A more complete statement of the 
characteristics of the disease will be made at a later date. The 
description follows : 
Colletotrichum destructivum sp. nov. 
Maculis indeterminatis brunneis ; acerz'ulis minutis 25-70 ju, 
diam., sparsis v. gregariis, erumpentibus, elevatis ; mycelio hya- 
lino, granuloso; basidiis fasciculatis, hyalinis, cylindraceis v. fu- 
soideis, conidiis prope aequalibus; conidiis hyalinis, granulosis, 
1-4 guttulatis, rectis v. leniter curvulis, utrinque rotundatis 3.5- 
J S. M. Bain and S. H. Essary. A new anthracnose of alfalfa and red 
clover. Jour. Myc. 12: 192. 1906. 
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