tort] ATKINSON—DICTYOPHORA AND ITHYPHALLUS 9 
of mistaking the two in the younger stages, while the indusium 
remains adherent to the under surface of the pileus before the 
intervening primordial tissue is ruptured. In old plants after 
expansion, when the indusium has fallen away, as frequently 
happens, there is danger of confusing it with I. impudicus. Phallus 
ravenelii is also sometimes mistaken for I. impudicus, but this 
should not happen when one is familiar with the character of the 
pileus in the two species, and with the very different odors of the 
two. 
The first time that I met with growing examples of [thyphallus 
impudicus was in September 1903, when in company with Mr. 
GEORGE MAssEE I found two mature eggs in the Kew Gardens. 
These were taken to the Jodrell Laboratory and placed under a 
moist chamber. During the night one of them expanded, and on the 
following day there was very clear evidence of a thin, white, mem- 
branous veil between the stem and pileus, which was now lying 
on the stem a short distance below the pileus and partly encircling 
the stem asaring. I photographed the plant at the time, and the 
presence of this veil is very distinctly shown as a complete mem- 
branous ring around the stem (figs. 1, 2). The plant was then 
placed in alcohol, shipped by freight to this country along with 
other fungi, and it is now stored in alcohol in a museum jar in the 
Department of Botany in Cornell University, and shows well at the 
present time this thin, membranous veil. 
In August 1905, in the Jura Mountains at Pontarlier, France, 
I reared several plants in moist chambers from mature eggs. In 
all of these the veil was present and adhered either as fragments 
or as a ring on the stipe. Sometimes also fragments clung to the 
margin or under surface of the pileus. Several photographs were 
made of these and one is shown in fig. 2. It is interesting to note 
in this photographic reproduction the collar around the stipe 
below, which is the lower remains of the veil where it is attached 
to the broader remnant of primordial tissue. This is exactly the 
same structure that is present at this stage in Phallus ravenelii. 
Dissection of the eggs can be made also in such a way as to show 
a distinct, thin, membranous veil between the stem and pileus 
before expansion (fig. 8). The veil thus separated from the two 
