ARTHUR AND JOHNSTON: UREDINALES OF CUBA 161 
Aecidium Cissi Wint. Hedwigia 23: 168. 1884. 
ON VITACEAE: 
Cissus sicyoides L., Baracoa (Prov. Oriente), April 14, 
1916, Johnston 502. 
This short-cycle rust has been considered iot recently a stage 
of a heteroecious species. It is known from Jamaica and Porto 
Rico, and from Panama and the northern border of South America. 
112. BoTRYORHIZA НІРРОСКАТЕАЕ Whetzel & Olive, Am. Jour. 
Bot. 4:47. 1017. 
ON CELASTRACEAE: 
Hippocratea volubilis L., Alto Cedro (Prov. Oriente), 
March, 1903, Underwood & Earle 1636; Baracoa (Prov. 
Oriente), April 15, 1916, Johnston 633. 
A peculiar white-spored rust, formed on hypertrophied areas. 
It also occurs abundantly in Porto Rico, but has not been reported 
elsewhere. 
II3. Aecidium Pisoniae sp. nov. 
ON NYCTAGINACEAE: 
Pisonia aculeata L., Ceballos (Prov. Camagüey), Nov. 25, 
1915, Johnston 208. 
Pycnia amphigenous, few, on discolored spots, noticeable, 
subepidermal, globose, 96-128 in diameter; ostiolar filaments 
64—80 и long. 
Aecia hypophyllous, crowded in groups 3-5 mm. across, cupu- 
late, 0.1-0.2 mm. in diameter; peridium colorless, the margin 
somewhat recurved, erose, the peridial cells rhomboidal in radial 
section, 12-16 by 16-34 и, abutted, the wall evenly thick, 1.5-2 и, 
the outer wall smooth, the inner wall very finely and closely ver- 
rucose; aeciospores globoid or short-oblong, 15-16 by 16-23 и; 
wall nearly colorless, thin, about ги, very finely and closely ver- 
rucose. 
The rust has been collected only once. Early in July, 1916, 
the junior author visited the locality where he had first found it the 
. year before, and discovered that the forest had been cut down and 
burned off preparatory to planting cane. The host is abundant 
in the vicinity, but no rust could be detected upon other plants of 
it. The germination of the spores has not yet been studied, and 
the assignment to the genus is based upon superficial characters 
only. If correctly placed, it is probably heteroecious. 
