1918] JACKSON—PUCCINIA 203 
Teliospores averaging over 40 pw in length 
Spores with abrupt semihyaline umbo at apex..... 24. P. pinguis 
Spores rounded at apex 
panel sparsely echinulate, 18-26 by 22-30p, wall 
tigers PtH Ss cei re re ea 15. P. semiinsculpta 
Haas Geo closely echinulate, 26-29 by 29-34 p, wall 3-3.5 
WRICK eis, Ss ee oes Cg Paes ey pe 25. P. Kuntz 
1. Puccinta Becki Mayor, Mem. Soc. Neuch. 5:509. 1913. 
O. Pycnia epiphyllous, few, gregarious on yellowish somewhat 
hypertrophied spots, o. 5-1 mm. across, frequently extending along 
veins, conspicuous, subepidermal, orange yellow, fading to blackish, 
globoid or flask-shaped, 112-120 by 125-130 u, ostiolar filaments 
50 uw long. 
I. Aecia hypophyllous, few or solitary, in groups opposite the 
pycnia, cylindrical; peridium white, membranous, lacerate; 
peridial cells seen only in face view, irregularly polyhedral, 16-23 
by 26-32 u, wall colorless, thin, 1.5-24, prominently verrucose- 
rugose; aeciospores globoid to ellipsoid, somewhat irregular, 16-22 
by 23-34, wall colorless, 2 thick, closely and prominently 
verrucose, with low warts often arranged in longitudinal lines, 
especially near either end, pores obscure. 
II. Uredinia amphigenous, chiefly hypophyllous, scattered, 
small, o.2-0.5 mm. across, round, early naked, somewhat pul- 
verulent, cinnamon brown, ruptured epidermis not conspicuous; 
urediniospores globoid or broadly ellipsoid, 18-22 by 22-24 u, wall 
pale cinnamon brown, about 2 u thick, moderately echinulate, pores 
obscure. 
III. Telia chiefly hypophyllous, scattered, pees 0.2-0.5 mm. 
across, round, early naked, compact, pulvinate, germinating at 
maturity, chestnut brown, ruptured epidermis not conspicuous; 
teliospores cylindrical or fusiform, 13-19 by 58-90 », wall cinnamon 
brown, 1-1.5 u thick, smooth; pedicel colorless, fragile, short, up 
to 40 uw long. 
On Vernonia divaricata Sw., 1, U1, III, Mandeville, Jamaica, February 23, 
1915, Holway. 
The collection from Jamaica already cited agrees in all essential features 
with the type of P. Becki in the uredinial and telial characters, and is assigned 
to that species with considerable confidence. In addition to the uredinia and 
