ARTHUR AND JOHNSTON: UREDINALES OF CUBA 133 
similarity to the telia of Skierka, and it may represent a correlated 
short-cycle genus. Until the spores are germinated, it can not be 
known whether the pores are apical or lateral, a character having 
considerable importance. 
50. Uromyces Howe: Peck, Ann. Кер. №. Y. State Mus. 30: 75. 
1879. 
ON ASCLEPIADACEAE: 
Asclepias curassavica L., Santiago de las Vegas, Oct. 24, 
1915, II, Johnston 132; San Pedro, Isle of Pines, Feb. 12— 
March 22, 1916, II, III, Britton & Wilson 14809; Baracoa 
(Prov. Oriente), April 15, 1916, II, Johnston 519. 
Asclepias nivea L., San Antonio de los Вайоѕ (Prov. Haba- 
na), June 11, 1916, II, Johnston 778. 
The species is common in temperate regions northward, but 
rare in the tropics. The only other West Indian island where it 
has been taken is Porto Rico. 
The life cycle is uncertain. Only uredinia and telia are known, 
and whether the rust possesses both pycnia and aecia, and whether 
it is autoecious or heteroecious, are yet wholly open questions. 
51. URoMYCES GEMMATUS Berk. & Curt.; Berkeley, Jour. Linn. 
Soc. 10: 357. 1869. 
ON CONVOLVULACEAE: 
‚ Jacquemontia nodiflora (Desv.) С. Don (Convolvulus nodi- 
florus Desv.), Prov. Oriente, 1856, II, Charles Wright. 
The species is autoecious, having pycnia, uredinia, and telia, 
but no aecia. The collection made by Charles Wright, here listed, 
is in the Curtis collection at Harvard University. It is labelled 
“ Uredo gemmata Berk. & Curt. уаг., and possesses only uredinia. 
The type of the species in the Kew herbarium, Wright's no. 278, 
has not been seen. The species was not again collected until 
found by F. L. Stevens in a number of localities in Porto Rico, 
1913. Specimens, now first reported, were secured by Е. W. D. 
Holway in Porto Rico in 1911, and in Jamaica in 1915. The only 
other known locality is St. Croix. A full description of the species 
with notes is given in Mycologia 7: 192-193. 1915. 
