368 BOTANICAL GAZETTE [ may 
obtained of its entering deeply the tissues of the host. It is somewhat 
difficult to detect the mycelium, but after soaking the infected leaves 
in potassium hydrate for several days enough of the chlorophyll was 
removed to enable one to distinguish the hyphe. A full-grown apo- 
thecium was loosened from a leaf without removing it entirely, and 
upon examination it showed that only the epidermis of the host, cov- 
ered with the fungus mycelium, was torn away with the apothecium 
(jig. 2). 
The general appearance of the young apothecia indicates that they 
are developed superficially by the formation of a knot of hyphe. 
The mycelium is so densely interwoven in the immediate region of 
the apothecia that an examination is somewhat difficult, but a few 
mounts were secured, showing it to consist of irregularly branching 
hyphe, very small and of slightly greenish tinge, similar in color to 
the apothecia. The hyphz are so dark colored that it was not easy to 
determine whether the mycelium is generally coenocytic or multicel- 
lular, but a few septations could be made out ( fg. 3). 
The mature apothecium is stalked, but in younger stages, previous 
to the development of the spores, and even earlier, when the contents 
of the apothecium are not yet differentiated into asci, the width is so 
nearly the same along the entire length that the stalk cannot be distin- 
guished from the body. The hyphz by which the stalk is attached to 
the mycelium are densely interwoven at the base, and often several 
apothecia are connected so that when torn away from the host they 
still adhere to one another by this mycelial mat (fig. 4), which forms, 
as it were, the beginnings of a stromatic cushion. The surface of the 
apothecium is rough and the wall is friable; it is dark olive green, 
the upper part being covered with a white, granular tomentum. The 
general outline of the apothecium is that of a vase. Dehiscence is 
apical, with the development of an ostiole, which does not appear 
till the apothecium has almost attained its growth and the asci and 
spores have been differentiated. The youngest apothecia observed 
appear as tiny dark projections on the surface of the leaf; these elon 
gate into club shaped bodies, but as yet show no signs of an ostiole. 
It would seem that the apothecial wall becomes thinner at the apex ase 
lateral growth increases, is finally ruptured and spreads outward near 
the top, giving the apothecium the appearance of being compressed 
just below the ostiole. __ 
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