1898 } THE DEVELOPMENT OF SOME ANTHRACNOSES 75 
The acervuli in section bear little resemblance to those of 
the ripe rot of apple. From a well developed cup-shaped 
stroma, lying some distance beneath the epidermis, the short 
continuous basidia arise. They do not project beyond the host, 
but the conidia are delimited beneath the epidermis. Although 
the acervuli may be closely adjacent, they seldom become con- 
fluent, and the structural characters maintain a greater uni- 
formity than is seen in G. fructigenum. 
In dilution cultures with meat- or potato-agar, however, the 
two species resemble each other in the early appearance of the 
colony. The conidia of G. phomoides germinate readily, fre- 
quently becoming once septate. The colonies show the dense, 
elongated, Y-shaped, or stellate center ;. the marginal growth 
does not present the regular, more or less parallel arrangement 
of hyphe seen in G. fructigenum, although this character depends 
somewhat on external conditions. With age, however, the roseate 
tinge of the colony is less marked. The mycelium is nearly or 
quite white until astroma begins to develop. This usually makes 
its first appearance in a circle about midway between the center 
and the margin, when the colony is from six to nine days old. 
This extends gradually both toward the center and the margin 
of the entire colony, frequently becoming in time a dark red- 
dish-brown. In parallel cultures of the two species this differ- 
ence is more marked in potato- than in meat-agar. In meat- 
agar the mycelium approaches the buff-pink tinge seen in G. 
Sructigenum, but here also a stroma is conspicuously developed. 
So uniform is this feature that it seems a valuable specific 
character. On bean stems the mycelium is a grayish-white at 
first, rather long and spreading ; an abundant stroma is devel- 
oped subsequently, which discolors the stems with thin, spread- 
ing, elliptical patches ; upon these the dark fruiting pustules are 
Situated. While the appearance on the stems is suggestive of 
the Gleeosporium of the apple and quince, in parallel observa- 
tions of the two, the Glceosporium ‘of the tomato was distin- 
fuished by the darker fruiting pustules, and the duller tint of 
the conidium mass.. At different times, however, and under 
