Jan. io, 1914 
Some Diseases of Pecans 
329 
and in culture ranged within the limits of 11 to 22 by 3.8 to 7.6/*. The 
accompanying graph (fig. 8) shows the measurements of 150 conidia taken 
from the same strain and under the same conditions as those noted above 
for the ascospores. The conidia have frequently been found to develop 
appressoria as described by various authors for the apple bitter-rot 
fungus. 
From the general pathology and temperature relations, the cross¬ 
inoculation and cultural studies, and finally from the morphology of the 
pecan fungus there can be no doubt of its specific connection with Glo- 
merella cingulata (Stonem.) S. and v. S.,the fungus causing bitter-rot of 
apple, ripe-rot of grape, and anthracnoses of a 
wide range of hosts. 
In several instances Glomerella perithecia 
have developed upon pecan leaves scattered 
among the densely gregarious pycnidia of a fun¬ 
gus which has since proved to be Phyllosticta 
convexula Bubdk. 1 The spores of the latter are 
almost bacillar in size, measuring 1.5 to 2 by 
1 jc, while in many cases only a few pycnidia upon 
a leaf matured in damp chamber, so that mor¬ 
phologically most of these fruiting bodies were 
similar to the immature perithecia of Glomerella. 
Furthermore, an examination of the fruiting 
bodies from type specimens of Sphaerella con¬ 
vexula (Schwein.) von Thum. 2 (, Sphaeria con¬ 
vexula Schwein. 3 ) shows them to be morpho¬ 
logically similar to those of Phyllosticta convex¬ 
ula. The original brief diagnosis of Sphaerella 
convexula was from immature material and 
without description of asci or ascospores. Sim¬ 
ilar material has been collected by the writer 
at various points in South Carolina, Georgia, 
and Florida, including one of the type localities 
of the species. 
Glomerella perithecia have been developed in a damp chamber, not 
only upon disinfected pecan leaves exhibiting the typical anthracnose 
blotches and among the pycnidia of Phyllosticta convexula , but also fre¬ 
quently upon leaves apparently healthy in every respect, showing the 
wide distribution of the former fungus and its ability to hibernate on 
the living host until the occurrence of conditions favorable to its further 
growth. 
M/CffOA/S 
Fig. 8.—Diagram showing conidial 
measurements of the anthracnose 
fungus. A , Dcngth of 150 con¬ 
idia. B , width of 150 conidia. 
1 Bubdk. Franz, Binige neue Pilze aus Nord America. Jour. Mycol., v. 12, no. 82, p. 52, 53, 1906. 
2 Saccardo, P. A. Sylloge Fungorum. v. 1, Patavium, 1882, p. 494. 
3 Schweinitz, L. D. von. Synopsis fungorum in America boreali media degentium. Trans. Amer. Phil. 
Soc. n. s., v. 4, p. 224, 1834. 
Berkeley, M. J. Notices of North American fungi. Grevillea, v. 4, no. 32, p. 154, 1876. 
