Part 4, 1920] AECIDIACEAE 3238 
71. Dicaeoma Magnusianum (Kérn.) Kuntze, Rev. Gen. 3°: 469. 
1898. 
Puccinia Magnusiona Korn. Hedwigia 15: 179. 1876. 
Puccinia simillima Arth. Bot. Gaz. 34:17. 1902. 
O. Pycnia epiphyllous, numerous, gregarious, in indefinite groups on discolored areas, 
deep-orange when fresh, fading to cinnamon-brown, globose, 65-96 u broad ; ostiolar filaments 
20-60 u long. 
I. Aecia hypophyllous and caulicolous, gregarious, in crowded groups 2-4 mm. across, 
cupulate, short, 0.2-0.3 mm. broad, bright-orange when fresh, becoming pale-orange on drying; 
peridium yellowish or almost colorless, the margin entire; peridial cells oblong in cross-section, 
23-29 by 26-32», abutted, the walls light-yellow, the outer 7-9 u, finely striate, the inner 
3-5 p, rugose; aeciospores globoid, 21-23 by 23-26 u; wall light~yellow, thin, 1-1.5 », finely and 
evenly verrtucose. 
On RANUNCULACEAE: 
Anemone canadensis I,. (A. pennsylvanica L.), Iowa, Kansas, Nebraska, New York, North 
Dakota, South Dakota, Wisconsin. 
II. Uredinia amphigenous, scattered, rather small, 0.3-0.5 mm. long, oblong, light-yellow, 
pulverulent, ruptured epidermis somewhat noticeable; paraphyses peripheral, clavate or 
cylindric, 10-21 » broad by 39-80 p high, the wall about 1 », thickened up to 5 wu above, light 
cinnamon-brown; urediniospores narrowly obovoid or oblong-clavate, 18-19 by 26—42 u; wall 
light-yellow, of medium thickness, 1.5—2 », moderately and finely echinulate, the pores 6-8, 
scattered, rather obscure. 
III. Telia numerous, amphigenous, small, about 0.5 mm. long, oblong, sometimes con- 
fluent in long lines on the sheaths, early naked, pulvinate, ruptured epidermis somewhat 
noticeable, blackish-brown; teliospores oblong or cylindric, 15-20 by 32-55 y, acuminate, acute 
or less often obtuse above, narrowed at base, scarcely constricted at septum; wall dark cin- 
namon- or chestnut-brown, usually much lighter below, thin, 1-1.5 u, much thicker at apex, 
up to 16 4; pedicel firm, colorless, as long as spore or longer. 
On PoacEAE: 
Phragmites Phragmites (1,.) Karst. (P. communis Trin.), lowa, Nebraska, New York, North 
Dakota, South Dakota, Wisconsin; Manitoba. 
TyPE LocaLiry: Europe, on Phragmites communis. 
DisTRIBuTION: Central New York to Manitoba and Nebraska; also in Europe, South Africa, 
and Japan. 
Te aons: Bot. Gaz. 34: 16, f. 4v, w, x; McAlpine, Rusts Austr. pl 2, f. 18; Krypt.-f. 
Brand. Pilze 3: f. B93. : 
Exsiccati: Barth. Fungi Columb. 3957; Brenckle, Fungi Dak. 115, 292; Ellis & Ev. N. Am. 
Fungi 2238; D. Griff. W. Am. Fungi 94; Sydow, Ured. 274, 2330. 
72. Dicaeoma Windsoriae (Schw.) Kuntze, Rev. Gen. 33: 471. 
1898. , 
Puccinia Windsoriae Schw. Trans. Am. Phil. Soc. IT. 4: 295. 1832. 
Aecidium Pieleae Berk. & Curt.; Berk. Grevillea 3: 60. 1874. 
Puccinia omnivora Ellis & Ev. Bull. Torrey Club 22:59. 1895. 
Dicaeoma omnivorum Kuntze, Rev. Gen. 34: 469. 1898. 
O. Pycnia epiphyllous, abundant, gregarious, houey-yellow fading to brownish, flattened- 
globoid in vertical section, 65 u deep by 100-150 u broad; ostiolar filaments 30-60 » long. 
J. Aecia hypophyllous and caulicolous, seldom epiphyllous, gregarious, in small crowded 
groups, 2~—7 mm. across, cylindric, small, 0.2 mm. broad by 0.5 mm. high; peridium pale-yellow, 
the margin lacerate and recurved; peridial cells rhomboidal, 15-26 by 24-33 », overlapping, 
the outer wall striate, 7-11 u, the inner wall tuberctlose, 3-4 u; aeciospores globoid or ellip- 
soid, 15-18 by 16-23 y; wall light-yellow or nearly colorless, thin, 1-1.5 », finely verrucose. 
On RUTACEAE: . . . 
Ptelea trifoliata L., Alabama, Illinois, Indiana, Kansas, Kentucky, Maryland, Missouri, 
New York, Ohio, Virginia. 
IL. Uredinia amphigenous, scattered or sometimes confluent, linear, 0.3-1.5 mm. long, 
early naked, cinnamon-brown, ruptured epidermis conspicuous; urediniospores globoid or 
obovoid, 23-26 by 29-31 4; wall golden-brown, 1.5-2 4 thick, verrucose, the pores 5 or 6, 
scattered. 
