Part 4, 1920] AECIDIACEAE 313 
56. Dicaeoma leptosporum (Ricker) Arthur & Fromme. 
Puccinia lepiospora Ricker, Jour. Myc. 11: 114. 1905. 
O, I, and II. Pyenia, aecia, and uredinia unknown. 
III. Telia chiefly hypophyllous, scattered or somewhat grouped, broadly oblong, 0.5-— 
2 mm. long, early naked, pulvinate, very compact, blackish-brown, ruptured epidermis ap- 
parent; teliospores elongate-clavate, 16-21 by 65-112, 2—4-celled; upper cell short, about 
one-third the total spore-length in the 2-celled spores, truncate above, conspicuously coronate 
with 2~6 digitate projections, much narrowed at base, slightly or not constricted at septum; 
wall dark chestnut-brown above, fading to golden below, about 1.5 « thick, thicker above, 
7-10 w, digitate projections 9-12 » long; pedicel short, fragile, concolorous with the base of 
spore. 
On PoackakE: 
Trisetum Virletii Fourn., Mexico (state), Michoacan. 
E LOCALITY: Ixtaccihuatl, Mexico, on Trisetum Virletii. 
DISTRIBUTION: Southern Mexico. 
57. Dicaeoma Rhamni (Pers.) Kuntze, Rev. Gen. 3*: 470. 1898. 
Aecidium Rhamni Pers. in J. F. Gmel. Syst. Nat. 2: 1472. 1791. 
Aecidium crassum Pers. Neues Mag. Bot. 1:92. 1794. 
Aecidium Cathartici Schum. Enum. Pl. Saell. 2: 225. 1803. 
Puccinia coronata Corda, Ic. Fung. 1:6. 1837. 
Solenodonta graminis Cast. Cat. Pl. Mars. 203. 1845. 
Aecidium Allenit G. W. Clinton; Peck, Ann. Rep. N. Y. State Mus. 24:93. 1872. 
Aecidium pulcherrimum Rav.; Berkeley, Grevillea 3:61. 1874. 
Puccinia Loliit Nielsen, Ugeskr. Landm. 18751: 549. 1875. 
Puccinia Rhamni Wettst. Verh. Zool.-Bot. Ges. Wien 35: 545. 1886. 
Puccinia coronifera Kleb. Zeits. Pflanzenkr. 4: 135. 1894. 
Puccinia Catharticae Lagerh. Tromsé Mus. Aarsh. 17:52. 1895. 
Puccinia coronaia {. Melicae Eriksson, Ber. Deuts. Bot. Ges. 12: 322, hyponym. 1894; Centralbl. 
Bakt. 3?: 303. 1897. 
Puccinia Melicae Sydow, Monog. Ured. 1: 760. 1903. 
Dicaeoma Melicae Arth. Proc. Ind. Acad. Sci. 1903: 149. 1904. 
Puccinia Beckmanniae McAlpine, Rusts Austr. 116. 1906. 
Puccinia praegracilis Arth. Bull. Torrey Club 34: 585. 1907. 
Puccinia Erikssonii Bubak, Arch. Nat. Land. B6hmen 13: 107. 1908. 
O. Pycnia epiphyllous, in small crowded groups, honey-yellow, becoming blackish, 
globose in vertical section, 60-95 » in diameter; ostiolar filaments short. 
I. Aecia hypophyllous and caulicolous, in crowded circular groups, 5 mm. or more across, 
on discolored, more or less hypertrophied spots, cylindric, 0.2-0.3 mm. broad, up to 1 mm. 
high; peridium colorless, the margin recurved and irregularly lacerate; peridial cells oblong, 
19-24 by 26-35 yu, the inner wall rather thick, 5-7 uw, coarsely verrucose, the outer wall thicker, 
7-12 », smooth, transversely striate; aeciospores globoid or broadly ellipsoid, 15-19 by 16-24 u; 
wall thin, 1-1.5 «, colorless, closely and minutely verrucose. 
ON RHAMNACEAE: — oe. 
Berchemia scandens (Hill) Trel. (B. volubilis DC.), Alabama, Louisiana, Mississippi, South 
Carolina. 
Rhamnus alnifolia L, Hér., Idaho, Iowa, Michigan, Montana, New York, Vermont, Wisconsin; 
Manitoba, Ontario. < 
Rhamnus caroliniana Walt., Indiana, 
Rhamnus cathartica I,., Iowa, New York, North Dakota, South Dakota, Vermont, Wis- 
consin. 
Rhamnus lanceolata Pursh, Indiana, Iowa, Missouri, Nebraska. 
Rhamnus Purshiana DC., Idaho, Montana, Oregon, Washington; British Columbia. 
Rhamnus Smithii Greene, Colorado. 
ON ELAEAGNACEAE: 
Elaeagnus commutaia Bernh. (E. argentea Pursh), Montana, North Dakota; Alberta. 
Lepargyraea argentea (Nutt.) Greene (Shepherdia argeniea Nutt.), Colorado, Montana, 
Nebraska, Wyoming. . . . 
Lepargyraea canadensis (L.) Greene (Shepherdia canadensis Nutt.), Colorado, Idaho, Mich- 
igan, Montana, New Mexico, New York, Oregon, South Dakota, Utah, Washington, 
Wyoming; Alberta, Yukon. 
Il. Uredinia amphigenous, scattered, often covering the entire leaf, elliptic, 0.5-1 mm. 
long, soon naked, pulverulent, brownish-yellow, ruptured epidermis apparent; paraphyses 
variable, usually few or none, cylindric or somewhat clavate, 7-16 by 39-80 w, the wall uni- 
formly thin, about 1 4, smooth, pale-yellow or colorless; urediniospores globoid or broadly 
