210 GRIFFITHS : CONCERNING SOME West AMERICAN FUNGI 
Aecidium Cannonii sp. nov. 
Spermogonia mostly epiphyllous, minute, reddish-brown, con- 
fined to a central area, which early dies and turns brown, and from 
which aecidia may or may not be excluded ; aecidia hypophyllous, 
about 1 mm. long, developing centrifugally, commonly beyond 
the spermogonial area, but sometimes occupying it also, open- 
ing at the apex with a lacerated recurved margin; spores irregu- 
larly polyhedral, or simply angular by compression, commonly 
24 by 30 wand again about 20 by 30 with epispore uniformly 
thick (about 3 4), subhyaline, minutely rugose with coarsely gran- 
ular contents. 
The central area of the spot upon the leaf dies early and turns 
brown as stated above. Sometimes the aecidia develop in the 
lower side of this area, but commonly only beyond it. The brown 
area is surrounded by an irregularly blackened zone extending a 
short distance beyond the aecidia. The spots are commonly I 
cm. or less in diameter. It is quite probable, however, that the 
seasonal variation may have a decided influence upon the character 
of the spot formed. As is well known, this plant drops its leaves 
on the advent of dry weather. If the wet season should happen 
to be prolonged it might cause a decided difference in the appear- 
ance of the attack. I take pleasure in dedicating the species to 
Dr. W. A. Cannon, who was the first to collect it, and who directed 
where I could find it. 
On leaves of Fouguieria splendens Engelm., in Sabiiio Cafion, 
Santa Catalina Mountains, Arizona, September 10, 1904. 
AErcIDIUM SARCOBATI Peck 
Present mycological practice of considering fungi on diverse 
hosts distinct might, in the absence of field notes, lead to the 
establishment of a different species upon Nitrophila occidentalis 
from that growing on Sarcobatus. The hosts were found growing 
together at Smoke Creek, Nevada, in August, 1902, and both 
loaded with aecidia. The peridia of the form on Nitrophila are 
slightly smaller than those on Sarcobatus, but there are no other 
differences. 
Puccinia Eurotiae sp. nov. 
Sori persistently hypophyllous, circular, usually aggregated and 
forming an entire black covering over a large section of the lamina 
of the leaf on each side of the midrib, where they may be elon- 
