tg1t] ATKINSON—DICTYOPHORA AND ITHYPHALLUS 13 
the volva. These were stained, mounted in balsam, and then 
photographed at various magnifications, as indicated in the descrip- 
tion of the plates. They were also subjected to careful micro- 
scopic study. 
It will be interesting to study the figures here reproduced from 
some of these photographs. Figs. 9, 10, 11 are from longitudinal 
(radial) sections at the base of these three species. Fig. 9 is 
Ithyphallus impudicus, and the parts are as follows (the outer 
layer of the volva is not shown here): F, gelatinous layer of the 
volva; D, inner layer of the volva; G, gleba; P, pileus; A, stem; 
B, primordial tissue. The primordial tissue shows no differentia- 
tion. It consists of intricately interwoven hyphae and is a remnant 
of the primordial tissue of the young fruit body, which has been 
left behind after the organization of the other parts of the plant. 
Next the pileus and the stipe there is a slightly darker line, the 
result probably of a slight massing or distintegration of those 
hyphae which are crowded by the enlarging stem and pileus. 
There is no evidence here of the differentiation of another structure 
‘within this primordial tissue. At the narrowed portion above is 
the point near which the primordial tissue is torn apart in the 
elongation of the stem, separating the thin, membranous part from 
the broader part below (see fig. 2). | 
Fig. 10 is of Phallus ravenelit. The primordial tissue lying 
between the base of the stem and the lower part of the pileus 
also shows no differentiation, the portions next the pileus and stem 
staining slightly darker, as in J. impudicus, and from the same cause. 
This represents a rather thin veil for P. ravenelii, and therefore 
serves to show, aside from there being no difference in its structure, 
position, and relation at this point in the fruit body from the veil 
of I. impudicus, that it is not any more massive. A short distance 
above the margin of the pileus is the point where the veil ruptures, 
leaving the collar of primordial tissue around the base of the stem 
as in I. impudicus. 
Fig. 11 is of Dictyophora duplicata. The parts are lettered as 
in the two previous figures of J. impudicus and P. ravenelii. We 
note outer layer of volva; F, gelatinous layer of volva; D, inner 
layer of volva; G, gleba; P, pileus; A, stem; and B, primordial 
