196 
Mycologia 
3006, there occur pycnia and uredinoid aecia (primary uredo), 
which give the following characters : 
Pycnia amphigenous, numerous in small groups, honey-yellow 
becoming darker, subepidermal, globoid, ioo-140/x in diameter; 
ostiolar filaments few, 20-30 ja long ; basidiospores large, 5-7 /x in 
diameter. 
Aecia uredinoid, amphigenous, circinating about the groups of 
pycnia, resembling the uredinia, but somewhat larger and less 
pulverulent ; aeciospores pedicellate, resembling the uredinio- 
spores. 
The uredinia and telia are described elsewhere, and especially 
well, by Sydow, Monog. Ured. 2 : 3. 1909. The characters 
given above entitle the species to be placed in the genus Klebahnia, 
in which it should be Klebahnia Bidentis (Lagerh.) nov. comb. 
35 - Uromyces densus sp. nov. 
Telia hypophyllous, numerous, in small groups on slightly dis- 
colored spots, pulvinate, coalescent, all sizes from o.i to i mm. in 
diameter, often a central, large, cushion-shaped sorus surrounded 
by smaller ones, frequently in a circle, dull cinnamon-brown 
becoming cinereous by germination ; teliospores obovoid or 
oblong, 16-23 by 24-38 /x; wall pale cinnamon-brown, thin, l- 
1.5 /X, thicker above, 3-9^1, smooth; pedicel nearly colorless, deli- 
cate, once or twice length of spore. 
On Carduaceae: 
Bidens pilosa L., Ponce, Nov. 8, 4266. 
The same species was collected on B. leucantha at La Car- 
melita, P. R., April 18, 1904, by G. P. Clinton. 
The species was also collected on B. pilosa at Caracas, Vene- 
zuela, July 15, 1913, by Dr. Stevens, 2gj8, 2^82, 2gg8, 3007. 
All these collections show the same characteristics of dense 
groups of sori, centrally cinereous from germination of the 
spores. The appearance is wholly unlike that of Uromyces 
Bidentis with its low, small sori, which do not coalesce and 
thicken into cushions. The teliospores, however, are essentially 
alike in the two species. U . densus is to be considered a short- 
cycle form, for which U. Bidentis is the corresponding long- 
cycle form. 
{To be continued) 
