312 
Passing now to the Avisema, there is an additional point of 
interest in that zcidia, as before, are more limited in their range. 
While not producing cups upon the petiole and midrib exclusively, 
it is true that a margin of the leaf that lies outside of a boundary 
line made by the blending of sub-peripheral veins does not as 4 
rule bear the zcidia. On the other hand, the teleutospores have 
a preference for this outer belt of the leaf,and frequently are not 
found elsewhere. 
The two companion leaves in the engraving, the one of the 
eecidial and the second of the teleutospore form of the fungus, 
illustrate the point, the leaves being chosen from a -few chancé 
specimens in the herbarium. It is most likely that with a little 
search for them in the field much more striking examples could 
be found of this peculiarity in the leaf range of this polymorphic 
parasite. 
The fact that the zcidia are most abundant upon the petiole 
and main vein of the Peltandra, and not infrequently appeat upon 
the stem and inflorescence of Arisema, would indicate that ms 
greater thickness or greater succulence, or both combined, furnish 
in more favorable conditions for the development of the zecidia. 
In fact this, the first form of the fungus, develops its cups often be- 
