Part 5, 1920] AECIDIACEAE 379 
TyP# LOcaLIty: Quito, Ecuador, on leaves of Bomarea sp. 
Disrrravurion: Southern Mexico and Central America; also in South America. 
InLusrRations: Holway, N. Am. Ured. 1: pl. 10, f. 42. 
Exsiccatt: Barth. Fungi Columb. 4563; Barth. N. Am. Ured. 822. 
157. Dicaeoma Pallor (Arth. & Holway) Arthur. 
Puccinia Palloy Arth. & Holway; Arth. Mycologia 10: 129. 1918. 
O. Pycnia amphigenous, crowded in small groups, 0.6-1 mm. across, noticeable, yellowish- 
or chestnut-brown, globoid, 96-160 1 in diameter; ostiolar filaments often agglutinated into 
a column, 112-160 » long. 
I. Aecia amphigenous, circinating about the pycnia, rather inconspicuous, 0.2-0.4 mm. 
in diameter, overarched by two or more layers of cells of the host tissue opening rather tardily 
by a slit or pore; peridium lacking, the aecia sometimes bordered at the sides by a thin layer 
of mycelium; aeciospores globoid or broadly ellipsoid, 18-23 by 19-24 u; wall colorless, thin, 
1-1.5 u, closely and finely verrucose. 
II. Uredinia hypophyllous, scattered, oval or oblong, 0.4-1 mm. long, rather tardily 
naked, at first opening by a slit or pore, later uncovered, pulverulent, yellowish, ruptured 
epidermis conspicuous; urediniospores broadly ellipsoid or obovoid, 18-21 by 23-28 p; wall 
colorless, thin, 1~1.5 y, finely and closely echinulate, the pores obscure. 
ITI. Telia hypophyllous, scattered, oval or oblong, 0.3—0.8 mm. long, rather early naked, 
somewhat pulverulent, white, ruptured epidermis evident; teliospores oblong or fusiform- 
oblong, 16-23 by 42-64 », rounded or acute above, rounded or narrowed below, constricted 
at septum, germinating at maturity; wall colorless, thin, 1 4, sometimes thickened on the sides 
or apex up to 3-4 yu, smooth; pedicel colorless, somewhat fragile, up to 35 u long. 
ON AMARYLLIDACEAE: 
Bomarea acutifolia Herb., Guatemala. 
Bomarea sp., Costa Rica. 
TYPE LOCALITY: Volcan de Agua, Antigua, Guatemala, on Bomarea acutifolia. 
DISTRIBUTION: Guatemala and Costa Rica. 
158. Dicaeoma (?) Iridis (DC.) Kuntze, Rev. Gen. 33: 469. 1898. 
Uredo Iridis DC.; Poir. in Lam. Encyc. 8: 224. 1808. 
Caeoma (Uredo) Iridis Schw. Trans. Am. Phil. Soc. II. 4: 290. -1832. 
Puccinia clavuligerae Iridis Wallr. Fl. Crypt. Germ. 2: 223. 1833. 
Uredo limbata f. Iridis Rab. Deutschl. Krypt.-Fl. 1:12. 1844, 
Puccinia Iridis Rab. Deutschl. Krypt.-Fl. 1:23. 1844. 
Uvromyces Iridis Lév. Ann. Sci. Nat. ITI. 8: 371. 1847. 
Puccinia truncata Berk. & Br. Ann. Mag. Nat. Hist. II. 13: 461. 1854. 
Trichobasis ividicola Peck, Rep. N. Y. State Mus. 24: 89. 1872. 
Puccinia crassivertex Thiim. Myc. Univ. 546. 1876. 
Trichobasis Iridis Cooke, Micr. Fungi ed. 4.227. 1878. 
O and I. Pycnia and aecia unknown. 
II. Uredinia amphigenous, numerous, scattered, roundish, oval or oblong, 0,2-0.5 by 
0.4-1 mm., early naked by longitudinal slits of the epidermis, pulverulent, cinnamon-brown, 
ruptured epidermis conspicuots; urediniospores ellipsoid or globoid, 19-27 by 24-32 yu; wall 
yellow or light cinnamon-brown, thick, 2-3.5 4, rather closely echinulate, the pores 3-4, 
equatorial or sometimes scattered. 
III. Telia amphigenous, numerous, scattered or sometimes confluent, oblong or linear, 
0.2-0.6 by 0.5-2 mm., early naked, compact, becoming pulverulent, ruptured epidermis notice- 
able; teliospores ellipsoid, clavate or oblong, 13-22 by 34-55 4, rounded or truncate above, 
narrowed below, somewhat constricted at septum, sometimes 3-celled; wall light- or golden- 
brown, rather thin, 1.5-2.5 4, thickened at apex, 5-104, smooth; pedicel concolorous, as 
long as spore or less. 
On IRIDACEAE: 
Tris Douglasiana Herb., California. 
Iris fulva Ker (I. euprea Pursh), Louisiana. 
Iris longipetala Herb., California. ; 
Iris missouriensis Nutt., Arizona, California, Colorado, Idaho, Washington. 
Iris tenax Dougl., Oregon. 
Iris tuberosa I,., California. . a : 
Iris versicolor 1,., Connecticut, Delaware, Indiana, Iowa, Louisiana, Maine, Massachusetts, 
Michigan, New York, Pennsylvania, Vermont, Wisconsin; Nova Scotia, Ontario, 
Quebec. 
Tris Xiphium U,., California. 
