138 NORTH AMERICAN FLORA [VOLUME 7 
3-4 short, blunt, semihyaline papillae, marginal tubercles about 2 to each cell, nearly color- 
less, cylindrical or somewhat capitate, 5-7 » long, 3-4 wide; cysts pendent beneath the 
head, ovate-oblong, hyaline; pedicel hyaline, short, deciduous. 
ON MIMOSACEAE : 
Mimosa fragrans A. Gray, Texas. 
TYPE LOCALITY: Austin, Texas, on Mimosa fragrans, 
DISTRIBUTION : Central Texas. 
ILLUSTRATION: Bot. Gaz. 35: pl. 2, f. 14. 
17. Ravenelia Mimosae-caeruleae Dietel, Beith. Bot. Centr. 20°: 378. 1906. 
O. Pycnia unknown. . 
II. Uredinia amphigenous, in groups, sometimes circinate, 0.3-1 mm. across, subcuticu- 
lar, early naked, light cinnamon-brown, ruptured cuticle not conspicuous; paraphyses abun- 
dant, intermixed with the spores, clavate, 10-14 by 45-72, smooth, thick-walled, 4-64, 
cinnamon-brown above, paler below, stipe solid; urediniospores globoid or broadly ellip- 
soid, 17-19 by 19-23; wall cinnamon-brown, uniform, about 1.5 thick, moderately 
echinulate-verrucose, pores 8 or more, scattered. 
III. Telia amphigenous, gregarious, 0.3-0.8 mm. across, sometimes confluent, sub- 
cuticular, early naked, blackish-brown, shining, ruptured cuticle noticeable; teliospore- 
heads chestnut-brown, 4-6 cells across, 65-80 in diameter, each spore bearing about 5 or 6 
straight tubercles, 3-5 # long, rounded or slightly pointed, nearly colorless; cysts 4-6, 
hyaline, pendent from the base of the pedicel, slow to burst in water; pedicel short, 
hyaline, deciduous. 
ON MIMOSACEAE : 
Mimosa caerulea Rose, Morelos. 
TYPE LOCALITY: Cuautla, Mexico, on Mimosa caerulea. 
DISTRIBUTION : Southern Mexico. 
ILLUSTRATION: Beih. Bot. Centr. 20°: pl. 6, f. 26. 
18. Ravenelia Mimosae-albidae Dietel, Beih. Bot, Centr. 20’: 378. 1906. 
O. Pycenia unknown. 
II. Uredinia amphigenous, numerous, scattered or often in circinating groups, occa- 
sionally confluent, round or oblong, 0.4-0.8 mm. across, subcuticular, early naked, pul- 
verulent, cinnamon-brown, ruptured cuticle noticeable; paraphyses intermixed with the 
spores, numerous, spatulate or clavate-capitate, 10-15 by 40-60, smooth, wall of head 
thick, 3-5, golden-brown above, stipe solid, hyaline; urediniospores globoid or broadly 
ellipsoid, 15-20 by 21-26 #; wall dark cinnamon-brown, 1.5-2.5 » thick, densely and evenly 
verrucose, pores 8-10 or more, scattered. 
III. Telia amphigenous, numerous, scattered, irregular, small, often confluent, sub- 
cuticular, soon naked, blackish-brown, shining, ruptured cuticle not conspicuous; para- 
physes wanting or same as in uredinia; teliospore-heads dark chestnut-brown, 4-6 cells 
across, 60-904 in diameter, each spore bearing 5-7 or more semihyaline, rather blunt 
tubercles, 4-7“ long, occurring beneath the head as well as above; cysts pendent from 
base of pedicel, not coherent, ovoid, 6-8, slow to burst in water; pedicel hyaline, short, 
deciduous. 
On MIMOSACEAE: 
Mimosa albida H. & B., Morelos, _ 
Mimosa albida floribunda Rob., Jalisco, Oaxaca, 
Type LOCALITY: Cuernavaca, Mexico, on Mimosa albida. 
DISTRIBUTION: Southern Mexico. 
ILLUSTRATION: Beih. Bot. Centr. 20?: 1. 6, f. 25. 
19. Ravenelia cassiaecola Atk. Bot. Gaz. 16: 313. 1891. 
O. Pycnia unknown. 
UU. Uredinia amphigenous, round or oblong, small, 1mm. or less across, subcuticular, 
early naked, pulverulent, cinnamon-brown, ruptured cuticle noticeable ; paraphyses none ; 
urediniospores ellipsoid or globoid, small, 12-17 by 13-20 #; wall cinnamon-brown, medium 
thick, 2-3 u, finely and closely verrucose, pores 6-8, scattered. 
