Part 5, 1920] AECIDIACEAE 381 
161. Dicaeoma (?) Cypripedii (Arth. & Holway) Arthur. 
Puccinia Cypripedii Arth, & Holway; Arth. Bull. Iowa Agr. Coll. Dep. Bot. 1884: 156. 1884. 
Oand I. Pycnia and aecia unknown. 
II. Uredinia hypophyllous, scattered, oval, 0.2~1 mm. long, early naked, pulverulent, 
cinnamon-brown, ruptured epidermis noticeable; urediniospores obovoid or ellipsoid, 15-19 
by 18-23 yu; wall cinnamon-brown, 1.5~2 u thick, moderately echinulate, the pores 2, super- 
equatorial. 
III. Telia amphigenous, somewhat crowded in groups, circular or oval, 0.4-1 mm. long, 
early naked, compact, pulvinate, chocolate-brown, ruptured epidermis noticeable; teliospores 
ellipsoid or clavate, 14-23 by 31~45 y, rounded or flattened above, narrowed below, somewhat 
constricted at septum; wall cinnamon-brown, 1.5 » thick, light chestnut-brown at apex and 
thicker, 7-12 2, smooth; pedicel slightly tinted or golden-brown, about one half length of spore. 
On ORCHIDACEAE: 
Cypripedium parviflorum Salisb. (C. pubescens Willd.), Iowa. 
Limodorum tuberosum 1. (Calopogon pulchellus R. Br.), Indiana, New Jersey. 
TYPE LocALIty: Decorah, Iowa, on Cypripedium pubescens. 
DIstTRIBUTION: Local in New Jersey, Indiana and Iowa. 
ILLUSTRATIONS: Holway, N. Am. Ured. 1: gl. 10, f. 44a, 6. 
Exsiccati: Barth. N. Am. Ured. 33; Ellis, N. Am. Fungi 1473. 
162. Dicaeoma Polygoni-amphibii (Pers.) Arth. Proc. Ind. 
Acad. Sci. 1898: 184. 1899. 
Puccinia Polygoni-amphibii Pers. Syn. Fung. 227. 1801. 
Uredo Polygoni Schum. Enum. Pl. Saell. 2: 233. 1803. 
Uromyces Betae Convolvuli Alb. & Schw. Consp. Fung. 127. 1805. 
Puccinia Polygoni Alb. & Schw. Consp. Fung. 132. 1805. Not P. Polygoni Pers. 1794. 
Puccinia Polygoni-Convolvuli Hedw. f.; Poir. in Lam. Encyce. 8: 251. 1808. 
Uredo Polygoni Persicariae Strauss, Ann. Wett. Ges. 2: 104. 1810. 
Caeoma (Dicaeoma) Polygoni Mart. Fl. Crypt. Erlang. 321. 1817. 
Dicaeoma Persicariae S. F. Gray, Nat. Arr. Brit. Pl. 1:541. 1821. 
Aecidium Geranii-maculati Schw. Schr. Nat. Ges. Leipzig 1:67. 1822. 
Puccinia Polygoni-Pennsylvanict Schw. Schr. Nat. Ges. Leipzig 1:72. 1822. 
Puccinia concenirica Schw. Trans. Am. Phil. Soc. II. 4: 295. 1832. 
Puccinia Amphibii Fuckel, Jahrb. Nass. Ver. Nat. 27-28: 15. 1873. 
Dicaeoma Polygoni-Convolvuli Arth. Proc. Ind. Acad. Sci. 1898: 184. 1899. 
Aecidium sanguinolentum Lindr. Bot. Not. 1900: 241. 1900. 
O. Pycnia amphigenous, gregarious in groups 1-8 mm. in diameter, conspicuous, honey- 
yellow, becoming brown, flattened-globoid, 115~160 1 wide by 80-100 high; ostiolar fila- 
ments 110-144 » long, usually agglutinated into a column. 
I. Aecia hypophyllous, closely crowded on yellowish or reddish spots 3-10 mm. in diameter, 
cupulate, 0.2-0.4 mm. in diameter; peridium slightly yellowish-brown, recurved, lacerate; 
peridial cells rhombic, 14-23 by 21-35 u, slightly overlapping, the outer wall 5-10, thick, 
transversely striate, the inner wall 2-5 » thick, closely and prominently verrucose; aeciospores 
globoid or broadly ellipsoid, 13-18 by 16-22 »; wall colorless, thin, 0.5-1 4, very finely and 
closely verrucose. 
ON GERANIACEAE: ; 
Geranium columbinum I,., Connecticut. 
Geranium incisum Nutt., Montana. . 
Geranium maculatum J,., Connecticut, District of Columbia, Indiana, Iowa, Michigan, 
Minnesota, Missouri, New York, North Carolina, Pennsylvania, Virginia, West Vir- 
ginia, Wisconsin; Ontario. 
II. Uredinia amphigenous, numerous, scattered, or crowded in small groups, round or 
oblong, 0.1-0.7 mm. across, early naked, pulverulent, cinnamon-brown, ruptured epidermis 
conspicuous; urediniospores ellipsoid or obovoid, 15-22 by 19-29 uw; wall cinnamon- or golden- 
brown, 1-1.5 » thick, closely or moderately echinulate, the pores 2, occasionally 3, stuper- 
equatorial or on Tovara subequatorial. 
III. Telia amphigenous or caulicolous, scattered, often becoming confluent, in small 
groups, round, 0.1-1.3 mm. in diameter, or linear up to 2.5 mm. long on stems, long covered 
by the epidermis, (or early naked on Bilderdykia and Gonopyrum), compact, dark grayish-brown 
(or brownish-black and shining on Bilderdykia and Gonopyrurm), ruptured epidermis notice- 
able; teliospores ellipsoid or clavate, 14-23 by 30-55 u, rounded or truncate above, narrowed 
