RUSTS ON COMPOSITAE FROM MEXICO. 
JG, ARTE R. 
Tue following enumeration of two hundred collections of Mexican 
rusts on Compositae comprises part of Mr. E. W. D. Hotwavy’s 
material obtained on his several trips into Mexico, not heretofore 
published; together with two specimens collected by C. G. PRINGLE, 
communicated by Mr. Hotway; two by Rose and PAINTER, com- 
municated by Dr. J. N. Rose; one by E. W. NELson, communicated 
by Dr. W. G. Fartow; and one by SELER, found in the phanerogamic 
herbarium of the N. Y. Botanical Garden. Of the fifty-four species 
in the list it has been found necessary to describe eighteen as new. 
It is interesting to note that the genus Puccinia embraces three- 
fourths of all the species, and the genus Coleosporium one-half of 
the remaining number. Two new species are described -under 
Dietelia, with some misgivings. Both of them are accompanied with 
spermogonia, and are devoid of a peridium. Whether these differ- 
ences should constitute valid ground for separation into a new genus 
is problematical without further knowledge of their life histories and 
affinities. Cronartium, Pucciniosira, Uredo, and AEcidium with one 
species each, and Uromyces with two species are the remaining genera. 
The present communication is another illustration of Mr. Hot- 
WAY’S skill as a collector, and his service in making known the Mex- 
ican rust flora. 
1. COLEOsPORIUM VIGUIERAE Diet. and Holw. 
On Viguiera helianthoides HBK., Tehuacan, Nov. 18, 1903, n0- 5355; 
dentata Spreng., City of Mexico, Oct. 14, 1898, no. 3055. 
2. COLEOsPoRIUM VERBESINAE Diet. and Holw. 
On Verbesina virgata Cav., Oaxaca, Oct. 21, 1899, nO. 3711} Cuernavaca, 
Oct. 30, 1903, no. 5298; Amecameca, Nov. 20, 1903, no. 5427: V- montanoifolta 
Rob. & Greenm., Patzcuaro, Oct. 19, 1898: V. pinnatifida Cav., Oct. 1896. 
3 COLEOsPorIUM ANcEPs Diet. and Holw. 
On Verbesina sphaerocephala A. Gr., Sayula, State of Jalisco, Oct. 7, 1993: 
ho. 5124; Zapotlan, State of Jalisco, Oct. 10, 1903, no. 5145. 
196 
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