48 ARISAEMA TRIPHYLLUM 
examination and breeding experiments. On a damp, thickly wooded 
hillside near Trevlac, Brown 
County, Indiana, in the last four 
years about a dozen specimens 
have been found, each bearing two 
leaves and two flower clusters 
(PLATE 3, FIG. 47). There is no 
unusual character other than the 
production of the two flower 
clusters. These are of the same sex 
Fic. 71 is diagrammaticsection on each plant and are entirely in- 
eben hae cae: & dependent, arising from two sep- 
w the distinct origin of the arate initial groups (TEXT FIGs. 
scapes. X 34. 71, 72). A few plants of a third 
Fic. 72. Semidiagrammatic = form, having leaflets with a shining 
cross section of petioles and scapes d ti 
of plant figured in PLATE 3, Pie glabrous lower surface and peti- 
47, and TEXT FIG. 71. olules 2-3 cm. long, have been 
vist pe ates found in the neighborhood of 
sony Signet mm treet Bloomington, Indiana. Whether 
and scape. or not these are simply variant 
forms, true mutants or distinct 
varieties cannot be said until a more careful study and possibly 
breeding experiments can be made. 
THE RELATION TO Uromyces CALADII 
The only fungus parasitic upon A. triphyllum as reported by 
Saccardo is Uromyces Caladii Farl. Without going into a detailed 
account of the fungus, some observations of its influence upon the 
host under consideration may be given. The aecidia occur on 
the lower leaf surface, rarely on the upper, on petioles and scape, 
on both surfaces of the spathe and occasionally on the ovary walls 
and sterile spadix. The cups appear with or soon after the ap- 
pearance of the leaves and flowers in spring. When the infection 
is severe, the parts attacked are deformed, the leaves being small 
and more or less rolled up, the spathe thickened and its hood 
shortened and erect, and the spadix is sometimes two to three 
times its normal size. The spermogonia have been found on the 
leaves and in the ovaries. Usually the spermatia are discharged 
