134 NORTH AMERICAN FLORA [VoLUME 7 
ON MIMOSACEAE : 
Prosopis julifiora (Sw.) DC., Texas. 
Prosopis velutina Wooton; Arizona. 
Prosopis sp., California. 
TYPE LOCALITY: Tucson, Arizona, on Prosopis juliflora. 
DISTRIBUTION : Southwestern United States from Texas to southern California, 
ILLUSTRATION : Bot. Gaz. 35: p/. 2 
: JS. 16. 
ExsiIccaTi: Ellis & Ev. Fungi Columb. 2372, 1481 ; Griff. West Am. Fungi 252, 252a, 254. 
5. Ravenelia Leucaenae Long, Bot. Gaz. 35: 126. 1903. 
O. Pycnia unknown. : 
II. Uredinia chiefly epiphyllous, round, small, 0.2-0.5 mm. across, scattered, subcutic- 
ular, soon naked, pulverulent, cinnamon-brown, ruptured cuticle noticeable; paraphyses 
mostly encircling the sorus, clavate, 15-18 by 40-60, wall smooth, thin, nearly colorless, 
fulvous at apex; urediniospores linear-oblong or linear-obovate, 15-18 by 30-50; wall thin, 
1-2 », slightly thicker above, upper half pale cinnamon-brown, lower half nearly colorless, 
sparsely echinulate-verrucose, pores 4, subequatorial. 
Ill. Telia chiefly epiphyllous, small, 0.3-1 mm. across, scattered, subcuticular, rup- 
tured cuticle noticeable, blackish ; teliospore-heads chestnut-brown, 5-6 cells across, 70-100 
in diameter, each spore bearing 4 or 5 small tubercles, 3-6 u long by 34 thick ; cysts flattened 
against the under side of the head, extending from the periphery to the pedicel; pedicel 
colorless, short, deciduous. 
ON MIMOSACEAE : 
Leucaena diversifolia Benth., Oaxaca. 
Leucaena esculenta DC., Guerrero, Jalisco, Oaxaca. 
Leucaena sp., Puebla. 
TYPE LOCALITY: Etla, Oaxaca, Mexico, on Leucaena diversifolia. 
DISTRIBUTION : Southern Mexico. 
ILLUSTRATION : Bot. Gaz. 35: pl. 3, f. 23. 
Exsiccati: Sydow, Ured. 1588, 1889. 
6. Ravenelia Leucaenae-microphyllae Dietel, Beih. Bot. Centr. 20°: 375. 1906. 
O. Pycnia unknown. 
II. Urediniospores intermixed with the teliospores, few seen, broadly ellipsoid; wall 
pale-brown, thin, finely echinulate, pores equatorial, about 4. 
III. Telia epiphyllous, scattered, small, 0.2-0.5 mm. across, subepidermal, blackish- 
brown, shining, ruptured epidermis inconspicuous; paraphyses few, cylindrical or some- 
what clavate, 7-15 by 45-60, walls smooth, thin, slightly thickened and tinted above, pale 
below; teliospore-heads chestnut-brown, 6-10 cells across, 70-100 in diameter, smooth ; 
cysts hyaline, coherent, appressed, bursting in water ; pedicel hyaline, deciduous. 
The position of this species is uncertain, as only telia and a very few urediniospores have been 
seen. The latter may not represent true soral development. The telia_are almost or quite like 
those of the South American #. australis Dietel & Neger, on Acacia Cavenia, the two species 
being kept separate chiefly on account of the hosts. 
On MIMOSACEAE : 
Leucaena microphylla Benth., Guerrero. 
TYPE LOCALITY : Iguala, State of Guerrero, Mexico, on Leucaena microphylla. 
DISTRIBUTION : Known only from the type locality. 
7. Ravenelia mexicana T'ranz.; Dietel, Hedwigia 33: 370. 1894. 
QO. Pycnia unknown. 
II. Urediniospores intermixed with the teliospores, few seen, globoid or ellipsoid, 18- 
20 by 22-254; walls pale-brown above, nearly colorless below, thin, echinulate, pores 4, 
equatorial. 
III. Telia amphigenous, scattered, small, subcuticular, brownish, ruptured cuticle con. 
spicuous ; paraphyses clavate-capitate, 18-20 by 40-55 2, walls thickened above, light chest- 
nut-brown at apex, colorless below; teliospore-heads chestnut-brown, 4-6 cells across, 60- 
80 in diameter, each spore bearing 2-4 blunt, curved, hyaline tubercles, short above, 
Jateral ones longer, ranging up to 8“; cysts hyaline, pendent, peripheral, swelling and 
bursting in water; pedicel weak, short, deciduous. 
