tg11] ATKINSON—DICTYOPHORA AND ITHYPHALLUS 17 
presence of a campanulate structure. more or less persistent and 
usually but not always suspended between the pileus and stipe, with- 
out regard to the important question of its real homology. With 
regard to the generic position of Ithyphallus impudicus the ques- 
tion may arise as to whether or not it should be placed in the genus 
Dictyophora on account of the rudiment of an indusium within the 
primordial tissue. If a rudimentary condition of an organ were 
to have the same taxonomic value as the well developed condition 
of the same organ, J. impudicus would be congeneric with the 
species of Dictyophora. But a rudimentary condition of an organ 
is not generally regarded as of equal taxonomic value with its well 
developed state in other species, though it may be of value in a 
study of phylogenetic relationship. J. impudicus, therefore, should 
not be placed in Dictyophora, or rather is not congeneric with it, 
though, curiously, it probably shows a closer phylogenetic rela- 
tionship to that genus than does Phallus ravenelit. Phallus 
ravenelli B. and C. and Ithyphallus impudicus (L.) are then to be 
regarded as congeneric, and if the genus Ithyphallus is to be retained, 
the former should then be known as Jthyphallus ravenelii (B. and 
C.) Ed. Fischer. 
CoRNELL UNIVERSITY 
Itnaca, N.Y, 
LITERATURE CITED 
I. BERKELEY, J. M., Phallus ravenelii, Grev. 2: ez7, 
Ia. Burt, E. A. The development of Mutinus caninus as Fr. Annals 
of Botany 10:343-372. pls. ro, 11. 1896. 
, Fhe Phalloideae of the United States. II. Systematic account. 
Bot. GAZETTE 22:379-391. 1896. 
2. Corpa, A. C. I., Icones Fungorum 5:70. pl. 7 
3. DeBary, A., Zur Morphologie der pales in a Betis zur Morph. 
u. Phys. d. Pilze. Erste Reihe, pp. 191-210. pl. 29. 1866. 
4. prem W. G., List of fungi found in the vicinity of Boston. pt. ii. 
2:224-2 28; ee on the foregoing list, pp. 229-252. 1878. 
5. Fiscuer, Ep., Zur Entwicklungsgeschichte der Fruchtkérper einiger 
Phalloideen. Ann. Jard. Bot. Buitenzorg 6:1-51. pls. 1-5. 188 
: , Untersuchungen zur vergleichenden Entwicklungsgeschichte und 
Svematik der Phalloideen. Denkschr. Schweiz. ae mn Gesell. oe 
1-103 (of separate). pls. 1-6. 1890. 
1d. 
