58 ARTHUR: NEW SPECIES OF UREDINEAE—XV 
bladder. Of the nine or more other species of rusts known on 
Malpighiaceae all but Puccinia barbatula Arth. & Johnston, 
from Cuba, have sculptured teliospores, but that species and the 
present one are in every other way unlike. 
I am especially pleased to have this opportunity to call at- 
tention to the excellent work of Mr. Paul C. Standley of the 
National Herbarium, as a taxonomist and collector. Although 
largely engaged with phanerogamic plants, he has made notable 
additions to the knowledge of the cryptogams. In his recent 
botanical excursion to Salvador, a region heretofore almost 
unknown to uredinologists, he obtained about 125 collections of 
rusts, among them being some new species. The name given 
to the present species is in recognition of Mr. Standley’s con- 
tribution to uredinology 
Uromyces Betheli sp. nov. 
O. Pycnia not see 
. Aecia ieooptietiodsc? in orbicular groups 2—5 mm. across, 
short, cupulate, 0.3-0.4 mm. in diameter; peridium colorless, 
fragile, ae margin recurved, ragged; peridial cells rhomboidal, 
16-19 0-32, some ewhat overlapping, the outer wall 5-7». 
thick, Hagin ay striate, smooth, the inner wall thinner, 1.5- 
2.5u, strongly verrucose; aeciospores gichon, ellipsoid or oblong, 
13-16 by 16—-22u,; wall colorless, thin, ry, finely verrucose. 
III. Telia mostly hypophyllous or caulicolous, eR 
wi aecia or separate, roundish or oblong, 0.5-0.8 mm 
pe often confluent into groups 2-5 mm. across, soon naked, 
somewhat pulverulent, dark chestnut-brown, ruptured epidermis 
a teliospores globoid, 25-30. in diameter; wall chocolate- 
brown, 3-44 thick, sometimes slightly thicker above, coarsely 
and closely verrucose; pedicel colorless, fragile, half length of 
spore or less 
On Silene verecunda S. Wats. (Caryophyllaceae), Whitmore, 
California, June 26, 1923, E. Bethel. This is the first Caryophyl- 
laceous rust known in which the telia immediately follow the 
aecia with no production of uredinia. Uromyces Lychnidis 
bik & Earle was originally described without uredinia. But 
they do occur, and this name is now made a synonym of U. 
Suksdorfu Diet. & Holw. Beside the two species already named 
there are three other species in North America, viz., U. caryo- 
phyllinus, U. verruculosus and U. Silenes. Under the genus 
Nigredo these names become N. Suksdorfii (Diet. & Holw.) 
