146 NORTH AMERICAN FLORA [VoLuME 7 
heads black, opaque, 5-7 cells across, 80-125 » in diameter, smooth ; cysts globoid, hyaline, 
pendent from beneath the head, not united; pedicel short, hyaline, deciduous. 
ON CAESALPINIACEAE : 
Gleditsia triacanthos J,., WWinois. 
TYPE LOCALITY : Clear Creek, Union County, Ilinois, on Gledilsia triacanthos. 
DISTRIBUTION : Known only from the type locality. 
ILLUSTRATIONS: Bot. Gaz. 35: $2. 2, 7.5; Beih. Bot. Centr. 202: pl. 6, f. 30. 
ExsiccaTi: Seym. & Earle, Econ. Fungi 207. 
2. Dendroecia Farlowiana (Dietel) Arth. Résult. Sci. Congr. 
Bot. Vienne 340. 1906. 
Ravenelia Farlowiana Dietel, Hedwigia 33: 369. 1894. 
Ravenelia Acaciae-micranthae Dietel, Beth. Bot. Centr. 202: 371. 1906. 
O. Pycnia amphigenous, numerous, in crowded groups 0.5-1 mm. across, surrounded 
by telia, noticeable, subcuticular, chestnut-brown, depressed-hemispherical, 65-150 in 
diameter, 25-40 » high. 
III. Telia chiefly epiphyllous, sparingly amphigenous, numerous, gregarious, often 
crowded about groups of pycnia, early naked, blackish-brown, shining, ruptured cuticle 
noticeable; teliospore-heads chestnut-brown, 5-8 cells across, 75-100 # in diameter, nearly 
or quite smooth; cysts 12-20, hyaline, coherent, bases appressed beneath head, bursting in 
water, extending to periphery; pedicel short, hyaline, deciduous. 
ON MIMOSACEAE : 
Acacia anisophylla S, Wats., Coahuila. 
Acacia crassifolia A, Gray, Coahuila. 
Acacia micrantha Benth., San Luis Potosi. 
TYPE LOCALITY: [Jimulco] Mexico, on Acacia anisophylia. 
DISTRIBUTION : Mexico. 
ILLUSTRATION: Bot. Gaz. 35: p1. 2, f. 6. 
3. Dendroecia Lysilomae Arth. Résult. Sci. Congr. Bot. 
Vienne 340. 1906. 
Ravenelia Lysilomae Arth. Bot. Gaz. 39: 392. 1905. 
O. Pycnia epiphyllous, crowded in small groups, punctiform, rather large, pale 
brownish-yellow, subcuticular, flattened hemispherical, 80-130 » wide, 20-30 » high. 
III. Telia epiphyllous, on pale spots, becoming ampbigenous, small, 0.25-0.5 mm. 
across, roundish, chestnut-brown, subepidermal, ruptured epidermis inconspicuous ; para- 
physes numerous, intermixed with the spores, inconspicuous, cylindrical, 7-10 by 30-40 z, 
light golden-brown, wall thin or rarely thick; teliospore-heads (often with a few obovate 
urediniospores intermixed) chestnut-brown, 7-9 cells across, 80-120 # in diameter, smooth ; 
cysts appressed beneath the head, extending from periphery to pedicel, united laterally ; 
pedicel colorless, short, deciduous. 
ON MIMOSACEAE : 
Lystloma tergemina Benth., Guerrero. 
TYPE LOCALITY: Iguala, Mexico, on Lysiloma lergemina. 
DISTRIBUTION: Known only from the type locality. 
4, Dendroecia verrucosa (Cooke & Ellis) Arth. Résult. Sci. Congr. 
Bot. Vienne 340. 1906. 
Ravenelia verrucosa Cooke & Ellis, Grevillea 15: 112. 1887. 
O. Pycnia epiphyllous, numerous in circular groups, punctiform, golden-brown, sub- 
cuticular, flattened-conical, 80-1304 wide, 25-45 high. 
III. Telia amphigenous, small, scattered, coalescing, subepidermal, pulverulent, dull- 
black, ruptured epidermis inconspicuous; paraphyses mostly encircling the sorus, cylindri- 
cal, somewhat contorted, 9-12 by 30-60, walls smooth, more or less thickened, especially 
above, upper half pale chestnut-brown, paler below; teliospore-heads (often with a few 
globoid many-pored urediniospores intermixed) chocolate-brown, opaque, 4-8 cells across, 
75-100 # in diameter, each spore bearing 5-8 small tubercles, 2~3 u high, pale-brown; cysts 
