_ a 1 
Sniper 
ASCOGENOUS FORMS OF GLOEOSPORIUM AND COL- 
LETOTRICHUM 
C. L. SHEAR AND ANNA K. Woop 
Anaccurate knowledge of the life-histories of fungi is of the greatest 
importance, not only to taxonomy, but especially to plant pathology. 
As many parasitic fungi possess two or more fruiting stages, in some 
cases occurring on different hosts, it is necessary to have a full knowl- 
edge of their complete course of development in order to know how 
they are reproduced and distributed, and to devise adequate methods 
of combating or preventing them. 
The fungi producing the diseases known as anthracnoses, which 
attack a great variety of wild and cultivated plants, have been de- 
scribed chiefly as species of Gloeosporium and Colletotrichum. The 
positive connection of these conidial forms with ascogenous stages 
was, so far as we are aware, first demonstrated by means of pure 
cultures by Professor G. F. ATKINSON, as reported by Miss STONE- 
MAN’ in 1898. FUCKEL? in 1869 gave Glocosporium juglandis Lib. 
(Marsonia juglandis (Lib.) Sacc.) as the spermagonial form of Gno- 
monia leptostyla (Fr.) Ces. & De Not., which occurs on Juglans 
regia. It has uniseptate conidia, and the ascospores are also unisep- 
tate, which facts seem to indicate that it is not congeneric with the 
organisms with which we are concerned at present. FUcKEL’s 
statement in regard to the connection between these two forms was’ 
based simply upon the association of the two on the same leaf, and 
was merely a guess. KLEBAHN?, however, has recently demon- 
strated by pure cultures and infection experiments that FUCKEL was 
correct in this case. Other forms studied by KLEBAHN, which have 
passed under the name of Gloeosporium, are G. nervisequum (Fiick.) 
* STONEMAN, B., The development of some anthracnoses. Bot. GAZETTE 26: 
69. 1898. 
? FUcKEL, L., Symbolae Mycologicae 123. 1869. 
3 KLEBAuN, H., Zuzammenhinge yon Ascomyceten mit Fungis imperfectis. Cent. 
f. Bakt. 152:336. 1905. 
259] [Botanical Gazette, vol. 43 
