64 BOTANICAL GAZETTE [JULY 
while R. longiana had a few hyaline ones. The writer has material from the 
type collections of both of these species, and a careful examination of this 
material shows that not only do both species have paraphyses, but that the 
paraphyses are identical in every respect and are present in the telia of the type 
material of both R. mesillana and R. longiana. A careful study of the other 
salient characters of these rusts has convinced the writer that they are identical 
in every respect and therefore should be considered as only one species 
In recent field work in Texas, the writer collected the pycnidial stage on 
Cassia roemeriana of what has heretofore been known as Ravenelia longiana. 
RAVENELIA SILIQUAE Long 
O. Pycnia unknown. 
II. Uredinia hypophyllous and caulicolous, on the leaves 
scattered, elliptical, o. 5—1.o mm. across, pulverulent, subcuticular, 
early naked, sudan brown, ruptured cuticle not prominent, uredinia 
on the woody twigs and branches perennial, very inconspicuous, 
elliptical, o.5-5 mm. long by o.5-2 mm. broad; urediniospores 
obovate, elliptical to rarely oblong, on the leaves 13-17 by 20-27 u, 
average for 10 spores 14.4 by 21, urediniospores on branches 
11-16 by 17-27 m, average for 20 spores 13.4 by 22.5 uw, uredinio- 
spores on both leaves and branches buff yellow; walls 1.5-2.5 4 
thick, concolorous, not thickened at apex, densely and strongly ver- 
-Tucose, germ pores 8, in two transverse zones of four each, equidis- 
tant from the equator; paraphyses abundant, intermixed with the 
spores, clavate to subcapitate, often curved, 7-10 by 50-67 yn, 
average for 10 paraphyses 9.5 by 62u, heads pale fulvous to 
hyaline, stipe slender, usually solid, hyaline, paraphyses in sori on 
woody branches few, 6-11 by 25-49 uw, average for 20 paraphyses 
8.3 by 38u. : 
— ML tela unknown. 
a On Mimosaceae: Distributed ; as follows: Tern, on ae ine 
San Antonio, Long, November 1916 (no. 6153); W. H. Mercer, February 1917 
a (no. 6263); _— on Acacia farnesiana, Etla, Oaxaca, Holway, October 
1899, no. 3841 of | Holway (type); Hawaii, on jrempaies farnesiana, Honolulu, ; 
o Hora ze Lyon, jou. 1013, ae 164, 4, SyDo’ 
= 3 aston he pd of thos fom Haw ares eye ith the : 
