Part 3, 1912] ABCIDIACBAB 261 



Dichrophyllum marginatum (Pursh) Kl. & Garcke {Euphorbia marginaia Pursh), Colo- 



. rado, Iowa, Kansas, Nebraska, South Dakota, Texas. 

 roinsetha barbellata (Bngelm.) Small {Euphorbia barbellata Bngelm.), New Mexico. 

 Poinsetiia deniata (Michx.) Small {Euphorbia deniata Michx. ), Colorado, Illinois, Indiana, 

 Iowa, Kansas, Missouri, Nebraska, Ohio, Texas, Utah, West Virginia; Hidalgo, 



Poinsetiia heierophylla (L.) Kl. & Garcke {Euphorbia heterophylla I,.), Indiana, Iowa, 



Kansas ; Morelos ; Bahamas ; Cuba ; Jamaica. 

 Poinsetiia strigosa (H. & A.) Arth. {Euphorbia strigosa H. & A.), Guerrero, Jalisco, 



Mexico (state), Veracruz. ^ -J > 



Zygophylltdium biformis (S. Wats.) Arth. {Euphorbia biformis S. Wats.), Jalisco. 



Zygophylhdtum hexagonum (Nutt.) Small {Euphorbia hexagona Nutt.), Nebraska. 

 Type locality : France, on Euphorbia sp. 

 Distribution : Connecticut to Minnesota and Vancouver Island, and southward throughout 



the United States, Mexico, Central America, and the West Indies : also in South America, Kurope, 

 Asia, and Africa. 



Illustrations : Ber. Deuts. Bot. Ges. 9 : pi. 14, f. 1-11, 23-29 ; 11 : pi. 4, f. 1-15. 



ExsiccATi : Carleton, Ured. Am. 18; BHis & Ev. N. Am. Fungi 1820, 3045, 3046; Ellis & Ev. 

 Fungi Columb. 337, 338, 1503, 1602, 1694, 1791, 1792, 1991, 1992, 2093, 2094, 2183; Earth. Fungi 

 Columb. 2695, 2893, 2989, 3090, 3292,3293,3394,3594 ; Earth. N. Am. Ured. 88, 89, 188; Sydow, Ured. 

 1051, 1152, 1153, 1256, 1352, 1503, 1853; Kellerm. Ohio Fungi 36, 98, 160; D. Griff. W. Am. Fungi 

 79, 352; Clements, Crypt. Form. Colo. 529,531; Seym. & Earle, Econ. Fungi 383,384,385a, b, 

 386a, b; Brenckle, Fungi Dak. 71, 119; Garrett, Fungi Utah. 148, 175 ; Thiim. Myc. Univ. 947 ; 

 Ellis, N. Am. Fungi 236; Rav. Fungi Am. 484, 492; Rab.-Wint.-Paz. Fungi l^m. 3925a, b ; Rab.- 

 Wint. Fungi nm.3009; Rab.-Paz. Fungi Eur. 4232. 



70. Nigredo Gouaniae (Kern) Arthur. 



Uromyces Gouaniae Kern, MycologiaS : 290. 1911. 



O and I. Pycnia and aecia unknown. 



II. Uredinia hypophyllous, scattered, roundish, small, 0.1-0.3 mm. in diameter, puncti- 

 form, chestnut-brown, ruptured epidermis inconspicuous ; paraphyses not very numerous, 

 encircling the sori, clavate or cylindrical, 10-16 by 30-40 m, somewhat incurved, the wall 

 colorless, thin, about 1^; urediniospores obovoid or broadly ellipsoid, 18-19 by 21-26/1; 

 wall light cinnamon -brown, 1.5-2 ju thick, evenly and sparsely echinulate, the pores 2, 

 occasionally 3, super equatorial. 



III. Telia hypophyllous, scattered, resembling the uredinia in shape and size, dark 

 chestnut-brown ; paraphyses none ; teliospores broadly ellipsoid or ovoid, 18-23 by 26-29 ju,^ 

 rounded or obtuse above, rounded or somewhat narrowed below; wall chestnut-brown, 

 moderately thick, 2-2.5 ju, with a slightly paler umbo making the wall 4-5 /x thick above; 

 pedicel tinted, once to twice length of spore. 



On Rhamnaceae : 



Gouania dom.ingensis'L,., Guatemala. 

 Type locality: I^aguna, Depart. Amatitlan, Guatemala, on Gouania domingensis. 



Distribution : Known only from the type locality. 



71. Nigredo Hyperici-frondosi (Schw.) Arth. Result. Sci. Congr. 



Bot. Vienne 344. 1906. 



Aecidium Hyperici-frondosi Schw. Schr. Nat. Ges. I^eipzig 1 : 68. 1822. 



Caeoma hypericatum Link, in Willd. Sp. PI. 6^ : 58. 1825. 



Uredo HyPeHci Spreng. Syst. Veg. 4 : 572. 1827. 



Caeoma ( Uredo) Hyperici Schw. Trans. Am. Phil. Soc. II. 4 : 291. 1832. 



Aecidium oblongum Bon. Abh. Nat. Ges. Halle 5 : 212. 1860. 



Uromyces iriquetrus Cooke, Proc. Portland Soc. Nat. Hist. 1 : 184. 1862. 



Uromyces Hyperici M. A. Curt. Cat. PI. N. Car. 123. 1867. 



THchobasis Hyperici W. Gerard, Bull. Torrey Club 4: 47. 1873. 



Aecidium minutissimum W. Gerard, Bull. Torrey Club 5 : 40. 1874. 



Aecidium Hypericorum Berk. & Curt.; Berk. Grevillea 3 : 61. 1874. 



Uromyces Hyperici-frondosi Arth. Bull. Minn. Acad. Nat. Sci. 2^ : 15. 1883. 



Uromyces pachycephalus Neger, Anal. Univ. Chile 93: 785. 1896. 



Caeomurus Hyperici Kuntze, Rev. Gen. 3* : 450. 1898. 



Caeomurus Hyperici-frondosi Arth. Proc. Ind. Acad. Sci. 1898 : 180. 1899. 



0. Pycnia amphigenous, in small groups, crowded, punctiform, honey-yellow becom- 

 ing blackish, globoid, 90-115 ju in diameter ; ostiolar filaments 30-80 m long. 



1. Aecia hypophyllous, crowded in small groups 1-2 mm. or more across, on discolored 

 spots, sometimes solitary, cupulate or sometimes short-cylindrical, small, about 0.1-0.2 

 mm. in diameter; peridium white or yellowish, the margin spreading or revolute, erose ; 

 peridial cells rhomboidal, 26-32 m long, the outer wall thick, 7-9 /x, transversely striate, the 



