ARTHUR: NEw UREDINEAE 591 
: often angular, very small, 10-13 # in diameter, wall pale-yellow, 
_ very thin, 0.5-1 », very finely verrucose, appearing smooth. 
On Boehmeria cylindrica (L.) Willd., Takoma Park, District of 
Columbia, June 6, 1898, collector uncertain, fungi of the T. A. 
Williams collection, distributed by the U. S. National Museum. 
This species is morphologically similar to the common Aecidium 
Orticae, belonging to Puccinia Caricis, but scarcely half the size 
throughout, and with other distinctions. The fungus has been 
collected in other localities along the Atlantic coast and in Indiana, 
but no specimens are in the writer's herbarium. 
Caeoma occidentale sp. nov. 
O. Pycnia amphigenous, scattered, minute, inconspicuous, 
; subcuticular, honey-yellow, hemispherical, 65-100 4 in diameter 
_ by 23-32 pw high. 
I. Aecia from a limited mycelium, hypophyllous, sparsely ar- 
: ranged in two rows on yellow spots occupying part or all of a 
leaf, roundish to oblong, 0.3—I mm. or more long by O.3-0.4 mm. 
_ wide, soon naked, orange-yellow ; peridium wanting ; aeciospores 
_¢atenulate, broadly ellipsoid, 20-24 x 27-32 4, wall colorless, 
_ medium thin, 1.5-2.5 », moderately and rather closely verrucose. 
~ On Pseudotsuga mucronata (Raf.) Sudw. (Pseudotsuga Douglas 
 Carr., Adies Douglasit Lindl.), Beaver River Valley, British 
~ Columbia, alt. 860 meters, July 27, 1907, Z W. D. Holway. 
This rust is interesting as the second foliicolous caeoma on 
Pinaceae in North America. The other occurs on 7suga canadensis 
= in the North Atlantic region. The eastern and western species differ 
: greatly in size of spores, and other characters. 
Uredo Grayiae sp. nov. 
II. Uredinia amphigenous, scattered, sometimes esabia 
- Toundish, 0.5—1 mm. across, soon naked, pulverulent, choco ate- 
_ brown, ruptured epidermis somewhat noticeable ; ap rg Abe 
. ellipsoid or obovate-ellipsoid, 19-23 X 32-42 4; wall dark ic a s 
= Nut-brown, somewhat lighter below, rather thick, 2-2.5 4, Sug oy 
_ thicker above, 2.5~3.5 -, moderately verrucose above, gh 
= along the sides, pores 8 in two transverse zones equidistant from 
_ the equator. 
On Grayia spinosa (Hook.) Mog. (G. 
polygaloides H. & A.), 
Harter 1506, communi- 
kable in the close 
: F; allon, Nevada, August 21, 1907, L. -. 
_ Cated by C. L. Shear. The species is remar 
