1898 ] THE DEVELOPMENT OF SOME ANTHRACNOSES 97 
fungus are formed, usually on the upper surface of the leaf, 
though they also occur on the lower side. 
It is distinguished as a Volutella by the marginal sete, and 
by the elevated character of the sporodochia, although in some 
cases the basidia are scarcely more elevated above the host than 
is found to be the case in some species of Colletotrichum. The 
conidia are continuous, hyaline, curved, acute at each end, 
measuring 15-21 X 3—4qpm. 
Upon germination the conidium contents become coarsely 
granular, and a germ tube pushes out at or near the end on the 
concave side. Sometimes a second and a third germ tube suc- 
ceeds the first. These soon become irregularly septate. With 
the growth of the fungus the mycelium becomes short celled 
and closely intermingled, forming at irregular intervals patches 
of stroma. The mycelium at these places, which is at first 
colorless, becomes irregularly swollen and colored; from the 
center of this mass the conidium bearing basidia are formed. 
Certain cells of the stroma give rise to the sete, which are 
enlarged at the base, usually twice or three times septate. 
Large colored club-shaped bodies are formed at the ends of 
certain threads of the mycelium, which frequently form gro- 
tesque masses by elongation and budding. 
The colony of the fungus is one of the most beautiful ones 
Studied. Three or four days after germination the small colo- 
nies present a stellate appearance; this character is gradually 
effaced and the mycelium forms a uniform colony of compact 
radiating threads. The acervuli are confined to a central region 
in the colony, in irregular arrangement, where a pink pigment 
is developed. This gradually extends over the colony, chang- 
ing to violet, and producing a beautifully iridescent play of 
colors, 
In tube culture a sparse grayish mycelium spreads over the 
stems, and forms a compact shining mass over the surface of 
the infusion which displays the iridescence seen in the colonies. 
With age this coloring disappears in the tubes but is quite last- 
Ingin Petri dishes. This delicacy of coloring is less marked 
