110 
Rcestelia , JEcidium , Ustilago , Uredo, and Albugo are included in this 
subfamily. The genus is described as follows: 
v. 155. Albugo, Persoon.—Sporidia globular, sessile, one-celled, inclosed in the bul- 
lated epidermis of live plants.—White.* 
The species Albugo cruciferarum , G-ray (Albugo Candida (Pers.) O. 
Kuntze), Albugo tragopogi (Pers.) Gray, and Albugo petroselini (DO.) 
Gray, are included under Albugo. Thus not only is the genus unmis¬ 
takably characterized in the description, but all the species included, 
excepting possibly A. petroseleni , are still retained in the genus. Otto 
Kuntze in his u Revisio generum plantarum,” issued in 1891, has re¬ 
stored Albugo. I may say that I had already decided that the change 
was necessary. It is a fortunate accident that the older name proves 
to be one so well adapted. It was long used as a subgeneric name for 
white rusts. Berkeley, writing in 1848, says: 
Dr. L6veille has described the genus under the name of Cystopus with very correct 
characters. It is to be wished, however, that he had adopted Schweinitz and Raben- 
horst’s sectional name of Albugo (Rab. Crypt. FI., vol. 1, p. 13), which is far more ex¬ 
pressive; and as a general principle sectional names ought certainly to be adopted 
when the sections are raised to the rank of genera, t 
1. Albugo candidus (Persoon) O. Kuntze. Revisio generum plantarum, Pars ii, 
1891, p. 658, footnote 1. 
1791. JEcidium Candida, Persoon. <Kmelin, Caroli a Linne Systema nat., ed. 13, tome 
2, pars 2, 1791, p. 1473. 
1847. Cystopus candidus (Persoon), L6v6ille. Sur la dispos. method, des Ur6din6es. 
<Ann. Sci. Nat., 3 e ser., t. 8, 1847, p. 371. 
Conidia on leaves, stems, and inflorescences, oospores in stems and 
inflorescences of Cruciferse. 
On Cardamine ludoviciana , Meyer. S. M. Tracy, March 21, 1888, 
Starkville, Oktibbeha County, Miss. Conidia only, on radical leaves. 
On Dentaria diphylla , L. L. M. Underwood. May, 1889, Dry den, 
Tompkins County, N. Y. Conidia and immature oospores on leaves. 
On Sisymbrium canescens , Nutt. F. D. Kelsey, April, 1888, Billings. 
Yellowstone County, Mont. Conidia only, on cauline leaves. F. D. 
Kelsey, No. 15, June, 1888, Helena, Lewis and Clarke County, Mont. 
Conidia only, on cauline leaves. 
On Sisymbrium linifolium , Nutt. F. W. Anderson, No. 9, May 17, 
1887, Helena, Lewis and Clarke County, Mont. Conidia only, on stems 
and cauline leaves. 
On Rrassica alba , L. E. M. Fisher, No. 88, August, 1890, Urmeyville, 
Johnson County, Ind. Conidia only, on cauline leaves. 
On Brassica nigra , Koch. T. A. Williams, No. 274 a , June, 1890, 
Weeping Water, Cass County, Nebr. Conidia only, on leaves. E. M. 
*Loc. cit., p. 540. 
t Berkeley, M. J. Ou the White Rust of Cabbages. <Jour. Hort. Soc., London, 
vol. 3, London, 1848, pp. 269-270 (p. 8 of reprint). 
