ati i ai hae 
1898 | THE DEVELOPMENT OF SOME ANTHRACNOSES 107 
leaf and in the growth characters manifested in artificial cul- 
tures. The pustules are erumpent, appearing on either surface 
of the leaf, indefinitely located on large, withered areas, or 
arranged in waving concentric circles. Conidia 12-15 X 3—4m, 
elliptical, 2-guttulate. Setz rising above the pink masses of 
conidia characterize the genus as a Colletotrichum, which agrees 
in other characters with the species described by Berkeley and 
Curtiss as Glewosporium cinctum. The sete frequently nearly 
obscured by the abundant masses of conidia are doubtless in 
some cases absent. 
On sectioning portions of the leaf, the Colletotrichum was 
found associated with a pycnidial stage and also a minute pyre- 
nomycetous form. The perithecia of the latter measured 48-75 
in diameter, were flask-shaped, borne singly or in clusters of two 
or three, on both upper and under side of the leaf. The bases 
of the perithecia were wholly or partly submerged, the partially 
emerging necks causing minute elevations in the tissue of the 
leaf. The spores were immature, and in sections the characters 
could not be well determined ; they were small, elliptical, slightly 
inequilateral, hyaline, single-celled, and measured approximately 
6-7 X 2-34. 
Dilution cultures of the conidia were made February 16. 
On February 17 germ tubes arising from one or both ends of 
the conidium had attained a length of 15—50u. Laboratory dried 
conidia which were sown later required a longer period for 
absorbing nutrient material before germinating. Many showed 
no sign of germinating twenty-four hours after sowing, except 
in the coarsely granular contents of the conidia. These later, 
however, germinated in the ordinary manner. The young colo- 
nies resulting from the conidia present a small, white center, 
from which proceed five or six slender radiating strands of 
mycelium which branch out about 2™ from the central point in 
fan-like tufts, remaining quite distinct in some colonies, while in 
others they mingle more or less at the margin, if the growth is 
luxuriant. The mycelium does not have such a loose, undulat- 
ing growth as that of G. cingulatum Atk., which it resembles in 
