UREDINALES OF PORTO RICO BASED ON 
COLLECTIONS BY F. L. STEVENS^ 
J. C. Arthur 
{Continued from page 255) 
76. Aecidium abscedens sp. nov. 
Pycnia epiphyllous, numerous on brownish spots 4-9 mm. 
across, prominent, golden-yellow becoming dark-brown, hemis- 
pheric, subcuticular, 140-200 /x broad by about half as high. 
Aecia hypophyllous, numerous in crowded groups, cupulate; 
peridia short, cylindric, 0.1-0.3 mm. in diameter, soon open, 
coarsely lacerate, somewhat revolute, peridial cells colorless, 
somewhat overlapping, oblong, 11-16 by 20-37 /x, the outer wall 
1.5-3 /X thick, smooth, the inner wall slightly thicker, moderately 
verrucose; aeciospores broadly ellipsoid or globoid, 18-21 by 
20-27 /X wall pale-yellow, thin, 1-1.5/x, very closely and finely 
verrucose. 
On Rubiaceae: 
Randia aculeata L., Mayaguez, May 2, 112^; Catano, Nov. 
3. 4534; Aguada, Nov. 22, 5089 (type). 
A more recent collection, April 25, 1914, comes from Martin 
Pena, P. R., made by Johnston & Stevens 1886. 
The species is apparently heteroecious. It is markedly different 
in both gross and microscopic appearance from the Mexican 
Aecidium pulverulentum Arth., which is the only other aecial 
form known on Randia, the publication of the host of the South 
American A. Randiae P. Henn. as Randia having been changed 
to Basanacantha (Hedwigia 43; 166. 1904). 
77. Aecidium Borreriae Pat.; Duss, finum. Champ. Guad. 7. 
1903. 
On Rubiaceae: 
Hemidiodia ocimifolia (Willd.) K. Schum., Mayaguez, 
May 3, 1147. 
1 Continued from Mycologia 7: 255. 1915. 
315 
