Part 2, 1907] AECIDIACEAE 137 
ON MIMOSACEAE : 
Acacia filtculoides (Cav.) Trel. (A. filicina Willd.), Guerrero, Morelos. 
Type collected at Iguala, State of Guerrero, Mexico, November 3, 1903, £. HW. D. Holway 5312, 
DISTRIBUTION : Southern Mexico. . 
14. Ravenelia texensis Ellis & Gall.; Dietel, Hedwigia 33: 42. 1894. 
Ravenelia texanus Ellis & Gall. Bull. Texas Agr. Exp. Sta. 9: 28, nomen nudum. 1890. 
O. Pycnia unknown. 
II. Uredinia amphigenous, small, scattered, subcuticular, early naked, pulverulent, cin- 
namon-brown ; paraphyses intermixed with the spores, spatulate or capitate, smooth, 10-14 
by 30-50 #, cinnamon-btown, paler below, wall thicker above, 5-8, stipe solid; uredinio- 
spores broadly oval or globoid, 18-20 by 18-24 #; wall golden-yellow, medium thick, 2-2.5 », 
echinulate-verrucose, pores 6-10, scattered. 
III. Telia amphigenous, smail, scattered, subcuticular, blackish, shining ; paraphyses 
none; teliospore-heads chestnut-brown, 5-6 cells across, 50-75 in diameter, smooth or 
with 2-4 very inconspicuous papillae on each cell; cysts pendent, 6-8, appressed to the 
underside of the head, slightly united with one another. 
ON MIMOSACEAE : 
(?) Acuan Jamesii (T. & G.) Kuntze (Desmanthus Jamesii T. & G.), Texas. 
TYPE LOCALITY : College Station, Texas, on Desmanthus (?). 
DISTRIBUTION: Central Texas. 
ILLUSTRATIONS: Hedwigia 33: pl. 3, f. 13; Bot. Gaz. 35: pl. 2, f. 1. 
15. Ravenelia mimosicola Arthur, sp. nov. 
O. Pyenia unknown. 
II. Uredinia amphigenous, numerous, scattered or in circinating groups, round, small, 
0.3-0.8 mm. across, subcuticular, early naked, cinnamon-brown, ruptured cuticle notice- 
able; paraphyses abundantly intermixed with the spores, capitate or clavate-capitate, 
small, 8-12 by 40-55, smooth, wall of head thick, thicker above and cinnamon-brown, 
paler below, stipe solid and colorless; urediniospores broadly ellipsoid or slightly obovate, 
small, 13-16 by 18-22%; wall pale cinnamon-brown, thin, about 1 4, closely and finely 
echinulate-verrucose, pores 6-10, scattered. 
III. Telia amphigenous, numerous, scattered, irregular, 1 mm. or less across, subcutic- 
ular, early naked, chocolate-brown, shining, ruptured cuticle noticeable; paraphyses 
none; teliospore-heads chestnut-brown, 5-7 cells across, 60-80” in diameter, each spore 
bearing 5-7 rather blunt, semihyaline papillae, 144 long; cysts pendent from pedicel 
attachment, ovate-oblong, slow to burst in water; pedicel hyaline, short, deciduous. 
ON MIMOSACESE : 
Mimosa polyanthoides Rob., Guerrero. 
Mimosa stifitata Rob., Guerrero, Morelos. . ; es 
Type collected at Iguala, State of Guerrero, Mexico, on Mimosa supitata, November 4, 1903, 
E.W. D., Holway 5326. 
DISTRIBUTION: Southern Mexico. 
ILLUSTRATION: Beih. Bot. Centr. 20%: pl. 6, f. 27. 
16. Ravenelia fragrans Long, Bot. Gaz. 35: 123. 1903. 
O. Pycnia unknown. 
Il. Uredinia amphigenous, often forming witches’ brooms, thickly covering large areas, 
or later scattered, round, 0.3-0.5 mm. across, often confluent, subcuticular, early naked, 
cinnamon-brown, ruptured cuticle scarcely noticeable ; paraphyses abundantly intermixed 
with the spores, mostly cylindrical, or somewhat clavate, 7-12 by 32-50 Hs wall thickened 
and pale cinnamon-brown above, nearly colorless below, peripheral ones thinner-walled and 
more spatulate; urediniospores ellipsoid or globoid, small, 13-15 by 18-23  ; wall pale cin- 
namon-brown, uniformly thin, 1.5-2, closely and minutely echinulate, pores 8 or more, 
scattered. 
Ill. Telia amphigenous, scattered, irregular, small, less than 1 mm. across, subcuticu- 
lar, soon naked, blackish-brown, shining, ruptured cuticle noticeable ; paraphyses none ; 
teliospore-heads chestnut-brown, 5-7 celis across, 65-85” in Giameter, each spore bearing 
