Part 2, 1907] AECIDIACEAE 131 
2. CYSTINGOPHORA Arthur, gen. nov. 
Cycle of development includes pycnia, aecia and telia, with distinct alternating phases ; 
autoecious. Pycnia subcuticular, other sori subepidermal. 
Pycnia low-hemispherical; hymenium flat; ostiolar filaments wanting. 
Aecia erumpent, cylindrical. Peridium dehiscent at apex, margin erect. Aeciospores 
ovoid; wall colored, finely verrucose. 
Telia erumpent, definite. Teliospores fascicled on compound stalks, forming heads 
bordered by hyaline cysts, each spore one- or two-celled ; wall colored, smooth or verrucose. 
Type species, Ravenelia Hicronymi Speg. (on Acacia Cavenia). 
1. Cystingophora Hieronymi (Speg.) Arthur. 
Ravenelia Hieronymi Speg. Anal. Soc. Ci. Arg. 12: 66. 1881. 
Aecidium Hieronymi Speg. Anal. Soc. Ci. Arg. 12: 78. 1881. 
Ravenelia Mimosae P. Henn. Hedwigia 4: 95. 1895. 
Ravenelia Acaciae-Farnesianae P. Henn. Hedwigia 34: 321. 1895. 
O. Pycnia caulicolous, numerous, thickly scattered, preceding or among the aecia, not 
conspicuous, subcuticular, cinnamon-brown, becoming darker, flattened hemispherical, 
small, 55-90 # in diameter by 25-30 uw high. 
I. Aecia chiefly caulicolous, thickly scattered over hypertrophied areas, cylindrical, 
0.2-0.3 mm. in diameter by 0.5-0.8 mm. high, subepidermal ; peridium erect, pale-yellow, 
margin erose, cells ovoid in surface view, overlapping ; outer wall thick, 5-7 u, transversely 
striate, inner wall much thinner, smooth ; aeciospores ovoid or irregularly oblong, 12-18 by 
19-30; wall cinnamon-brown, thick, 2-3, very minutely verrucose, appearing smooth. 
III. Telia chiefly caulicolous, scattered over hypertrophied areas, rounded, 0.4-0.6 mm. 
across, sometimes larger, tardily naked, dark chestnut-brown, ruptured epidermis notice- 
able ; teliospore-heads chestnut-brown, hemispherical or lenticular-globoid, 6-9 cells across, 
40-95 # in diameter, smooth; cysts 10-14, globose or ovoid, pendent from beneath the 
head; pedicel hyaline, 30-60 # long. 
ON MIMOSACEAE: 
Vachellia Farnesiana (l,.) W. & A. (Acacia Farnesiana Willd., A. Cavenia Hook. & 
Arn.), Texas; Durango, Michoacan. 
TYPE LOCALITY : Sierra Chica de Cordoba, Argentina, on Acacia Cavenia. 
DISTRIBUTION : Southern Texas to southern Mexico; also in South America, 
ILLUSTRATION : Hedwigia 33: £1.2,f.5; pl. 5, f. 27a. 
3. RAVENELIA Berk. Gard. Chron. 1853: 132. 1853. 
Pleoravenelia Tong, Bot. Gaz. 35: 127. 1903. 
Cycle of development includes pycnia, uredinia, and telia, with more or less distinct 
alternating phases. Pycnia and other sori either subcuticular or subepidermal. 
Pycnia depressed-conical. 
Uredinia erumpent, definite, without peridium. Urediniospores borne singly on pedi- 
cels, with or without intermixed paraphyses, ellipsoid to nearly fusiform ; wall colored, 
often paler below, echinulate or verrucose, pores zonal or scattered. 
Telia erumpent, definite. Teliospores fascicled on compound stalks, forming heads 
bordered by hyaline cysts, each spore one- or two-celled ; wall colored, smooth or verrucose. 
Type species, Ravenelia glandulosa B. & C. (on Tephrosia sp.). 
Host belonging to family Mimosaceae. 
Uredinial paraphyses absent. — 
Urediniospores with wall thicker above. 
Pores equatorial, 3. 1. R, Ingae. . 
Pores equatorial, 4-6. . 2. R. Pithecolobit. 
Urediniospores with evenly thick wall; pores equatorial, 3. 3. R. Entadae. 
Uredinial paraphyses present. 
Urediniospores with wall thicker above. : ; ; 
Pores in one transverse zone, which is equatorial. 4. R. arizonica. 
Pores in one transverse zone, which is subequatorial. 5. R. Leucaenae. 
Urediniospores with evenly thick wall. _ 
Pores in one transverse zone, equatorial. ; 
Paraphyses thickened above, cylindrical. 6. R. Leucaenae-microphyliae, 
7. R. mexicana. 
Paraphyses thickened above, clavate-capitate. 
