UREDINALES OF GUATEMALA 
441 
When this species was published in 1905 from Mexican material, 
it was considered that distinctly leptoform telia, with an abundant 
germination of teliospores taking place as rapidly as they matured, 
were incompatible with the association of grouped aecia accompanied 
by pycnia, such telia having always been considered short-cycled. The 
present collection shows the same intimate association of aecia and 
germinating telia, as also does a collection by Kellerman, Feb. 5, 1908, 
from the same region, on an undetermined Lupinus. 
A similar association is also to be seen m Uromyces elatus Syd., 
from South America. In that species the telia are not dark brown, 
but very pale brown, the spores being almost colorless under the mi- 
croscope. The teliospores of the South American species do not 
germinate so readily, but they are of the leptosporic form, having thin 
and delicate walls. No telia of either species have so far been found, 
except those with the aecia closely associated, although some collec- 
tions of aecia of both sorts have been found without telia. Both 
species are high-altitude forms. 
In view of the constant association of aecia and telia, both in this 
species and in U. elatus, it is now reluctantly admitted that there 
is strong likelihood of genetic connection. The aecia found with telia 
of U. montanus, and those of like characters but not so associated, are 
here placed under the name U. montanus. Such aecia have hereto- 
fore been placed with U. Lupini B. & C. Final decision must depend 
upon cultures. 
It is found by further study with more abundant material, that 
the aecia of U. Lupini are somewhat smaller and thinner-walled than 
those of the other two species mentioned. The aecia of U. montanus 
and U. elatus have each a distinctive macroscopic appearance, the 
former being cupulate and in circinating groups, while the latter are 
cylindric (not so stated in the original description, as the type speci- 
mens were immature) and in small groups of a few sori each, giving the 
appearance of irregular distribution. 
83. Uromyces illotus Arth. & Hoi. sp. nov. (on Fabaceae). 
Mucuna Andreana Micheli, Chinaulta, Dept. Guatemala, Feb. 12, 
1916, II, iii, 487. 
Uredinia hypophyllous, scattered, round or oval, 0.2-0.5 mm. 
across, early naked, pulverulent, dark cinnamon-brown, ruptured 
epidermis inconspicuous; urediniospores obovoid, 16-23 by 24-27 )u; 
wall cinnamon-brown, moderately thick, 1.5 /x, moderately echinulate, 
the pores 3-4, equatorial or sometimes scattered. 
I 
