534 MINNESOTA BOTANICAL STUDIES. 
placed in the genus Dictyophora on account of its having a 
persistent membrane hanging about the angle between the pileus 
and the stipe. This membrane is composed of the same tissue, 
the intermediate tissue A of my figures; which gives rise to the 
veil in DY. duplicata. Differentiation of this tissue does not 
advance in J. raveneli to the final stage of making this mem- 
brane pseudoparenchyma, or is this final stage reached in the 
case of hyphe composing the pileus in /. zmpudicus and in D. 
duplicata, yet no one would hesitate on that ground to use the 
term fzl/eus in connection with those species. It seems best to 
apply the term vez/ to this membrane in J. raveneliz which 
looks like a veil, has the position of a veil, is composed of a 
tissue forming the veil in other species and is likely to be re- 
garded as a veil without question by every botanist meeting this 
fungus for the first time and attempting its determination.” 
Burt’s interpretation of this structure seems hardly the best 
one. The membrane as shown in detail in Fig. 15 bears no 
resemblance whatever to the tissue of the stipe and pileus shown 
in detail with the same enlargement in Figs. 14 and 16. The 
attachment of this membrane at the base of the volva and the 
fact that it ruptures irregularly, are both strong reasons for not 
considering it as a true veil or indusium. It would seem better 
to regard it rather as tissue which in other species of both 
Lthyphallus and Dictyophora, is completely disorganized—with 
the exception possibly of 7. ¢enazs, mentioned by Penzig, where 
also a similar structure occurs. The presence of this tissue, al- 
though noted by the earlier writers, was not considered of im- 
portance enough to exclude the plant from the genus in which 
its other characteristics certainly placed it. 
The pileus is composed of tissue very similar in structure to 
that of the stipe, except that the walls are closely folded and 
the tissue of the chambers is not so completely disorganized. 
The structure of one of the folds is shown in Fig. 14 while a 
longitudinal section showing the relative position of the walls is 
shown in Fig. 18. From a surface view the pileus has a finely 
wrinkled or granulated appearance. It is firmly attached to the 
apex of the stipe just below the collar. The line of demarka- 
tion between the pileus and the stipe at the point of attachment 
is not easy to make out. In fact at the point of union the tissue 
of the three areas, stipe, pileus and collar is homogeneous. It 
is close within the axis of the stipe and pileus that the so-called 
