Part 6, 1921] AECIDIACEAE 417 
226. Dicaeoma Tetramerii (Seym.) Arthur. 
Puccinia Tetramerii Seym.; Pringle, Mex. Fungi 9. 1896. 
O. Pycnia amphigenous, grouped on brownish spots 2-4 mm. across, noticeable, cinna- 
mon- or chocolate-brown, globoid, 112-147 w in diameter; ostiolar filaments 112-128 u long. 
I. Aecia amphigenous, circinating about the pycnia, cupulate, 0.2-0.3 mm. in diameter, 
0.2-0.3 mm. high; peridium white, the margin erose, soon broken away; peridial cells narrowly 
rhomboidal in radial longitudinal section, 9-10 by 32-37 », abutted, the outer wall 3 u thick, 
closely and finely verrucose, the inner wall 1.5», closely and finely verrucose; aeciospores 
angularly ellipsoid or globoid, 18-21 by 24-32 4; wall colorless, 2 u thick, very closely and 
finely verrucose. 
II. Uredinia hypophyllous, few, scattered, oval, 0.1-0.3 mm. long, early naked, pulveru- 
lent, cinnamon-brown, ruptured epidermis evident; urediniospores obovoid, triangular- 
obovoid, or ellipsoid, 18-24 by 23-29 »; wall cinnamon-brown, 1.5-2 » thick, moderately echi- 
nulate, the pores 2, equatorial. 
III. Telia amphigenous, scattered, oval or oblong, 0.3-1 mm. long, early naked, somewhat 
pulverulent, dark chocolate-brown, ruptured epidermis evident; teliospores broadly ellipsoid, 
24-30 by 35-42 un, rounded above and below, not constricted at septum; wall dark chestnut- or 
chocolate-brown, thick, 3-5 4, lighter-colored and thickened at apex, 6-104, obscurely 
reticulate with meshes 2-3 uw across, appearing moderately and very coarsely verrucose in 
optical section; pedicel colorless, sometimes pale-brown and swollen into a collar next the 
spore, 50-80 » long. 
On ACANTHACEAE: 
Acanthaceae gen. & sp. indet., Guerrero. 
Tetramerium aureum Rose, Jalisco, Oaxaca, Puebla. 
Tetramerium hispidum Nees, Arizona. 
Tyrr Locality: Tomellin Cafion, Oaxaca, on Tetramerium aureum. 
DistriBpurion: Southern Mexico. 
Exsiccatt: Barth. N. Am. Ured. 769; Pringle, Mex. Fungi 9. 
227. Dicaeoma punctatum (Link) Arth. Proc. Ind. 
Acad. Sci. 1903: 150. 1904. 
Puccinia punctata Link, Ges. Nat. Freunde Berlin Mag. 7:30. 1815. 
Puccinia Galii Schw. Schr. Nat. Ges. Leipzig 1:73. 1822. 
Caeoma Galii Schlecht. Fl. Berol. 2: 115. 1824. 
Caeoma galiatum Link, in Willd. Sp. Pl. 62:52. 1825. 
Puccinia Galiorum Link, in Willd. Sp. Pl. 62:76. 1825. 
Uredo Galii-veri Cast. Obs. Myc. 1: 28. 1842. 
Aecidium Friesii Bubak, Sitz.-ber. Bohm. Ges. Wiss. 189878: 16. 1898. 
Dicaeoma Galiorum Arth. Proc. Ind. Acad. Sci. 1898: 182. 1899. 
Puccinia chondroderma Lindr. Medd. Stockh. Hégsk. Bot. Inst. 49:6. 1901. 
O. Pycnia epiphyllous, in small groups of a few only, globoid, 80-110 u in diameter by 
85—130 » high; ostiolar filaments short. 
J. Aecia hypophyllous, in small groups, 1-2 mm. across, cupulate, small, 0.2-0.3 mm. in 
diameter; peridium colorless, fragile, the margin erect, finely erose; peridial cells rhombic, 
18-26 by 24-32 uw, abutted, the outer wall thick, 7-9 u, smooth, transversely striate, the inner 
wall thinner, 3-5 », coarsely verrucose; aeciospores globoid or ellipsoid, 15-21 by 18-24 u; wall 
colorless, thin, about 1 u, finely and closely verrucose. 
Il. Uredinia amphigenous, scattered, round, small, 0.2-0.5 mm. in diameter, pulvinate, 
pulverulent, cinnamon-brown; urediniospores globoid, ellipsoid, or obovoid, 16-23 by 23-30 nu; 
wall light cinnamon-brown, moderately thin, 1.5-2 u, moderately and rather prominently 
echinulate, the pores 2, superequatorial. : 
Ill. Telia chiefly epiphyllous, scattered, round, small, 0.2-0.5 mm. in diameter, rather 
compact, pulvinate, chocolate-brown; teliospores ellipsoid or clavate, 16-26 by 37-564, 
rounded, truncate or angular above, narrowed below, slightly constricted at septum; wall 
cinnamon- or chestnut-brown, moderately thin, 1-2 u, much thickened at apex, up to 154, 
smooth; pedicel slightly tinted or colorless, fragile, once length of spore or less. 
On RUBIACEAE: . 
Galium A parine L,., Oregon, Washington. . . 
Galium asperrimum A. Gray, Arizona, New Mexico, Oregon, Washington. . . 
Galium asprellum Michx., Connecticut, Illinois, Iowa, Minnesota, New York, Wisconsin, 
Nova Scotia, Ontario. 
