58 THE FLORA OF NEBRASKA. 



Albngo tragopogonis (Pebs.) S. P. Gray. 1. c. 



p. Uredo tragopogonis Persoon Syn. Meth. Fang. L, 223. 1801. 

 ( 'ystopus tragopogonis Schroeter Pilze Schlesiens L, 234. 1886. 

 Cystopus cubicus.(V. Strauss) Lev. 1. c. 

 Cystopus spinulosus DeBart in Rabh. Fung. Eur. n. 179. 1863. 



Sori white, oblong or rounded, ainphigenous; conidia thin-walled, globose, 

 white tinged with yellow, 17-23 u; oospores globose, 48-53 u, epispore 

 brownish, minutely tuberculate, or sometimes incompletely reticulate, 

 the areolae 2 3 ft in diam. 

 On leaves of Antennaria plantaginifolia, Lincoln. 



Albngo ipomoeae-pandnranae (Sohw.) Swingle Journ. Myc. VIII., 112. 1892. 

 Aecidium ipomoeae-panduranae Schweinitz Syn. Fung. Car , 69. 1822. 

 Cystopus ipomoeae-panduranae Stev. & Swingle Trans. Kan. Acad. Sci. XL, 67. 

 Sori small, globose, yellowish; conidia rounded-oblong, truncate, 15x18 (i; 

 oospores irregularly globose or ovoid, bright yellow, brownish in age, 43- 

 52 ft, epispore prominently and irregularly tuberculate, tubercules 2-4 // 

 in diam. 

 On leaves and petioles of Ipomoea sp.; Richardson county, Ashland. 



2. SCL.EROSPORA Schroet. Pilze Schlesiens 236. 1886. 



Conidiophores erect, with few, short, turgid branches; conidia elliptical or 

 rounded, emitting zoospores through an apical papilla; oospores globose; 

 epispore brown, very thick. 



Etymology: Greek culvpoC, hard, and a-opa, seed. 



Sclerospora graminicola (Sacc.) Schroet. 1. c. 

 Peronospora graminicola Sacc. Michelia II., 586. 

 Peronosjwra setariae Pass. Grev. VII., 99. 1879. 



Sorus not present, conidiophores forming a very loose layer; conidia 13-15x 

 18-20 ji\ oospores globose, 40-45 fi\ epispore brown, smooth, very thick, 

 3-4 layered, 10-13 u. 

 In leaves and stems of Chamaerhaphis viridis and C. glauca; Ashland, Weep- 

 ing Water, Lincoln. PI. XVI., Fig. 4, a, b. 



3. PliASMOPARA Schroet. 1. c. 



Conidiophores breaking through the stomata, erect, sparingly branched, with 

 straight, ultimate branches, at length truncate; conidia papillate at apex, 

 emitting their contents as a whole, or as zoospores; oospores round, with 

 a thin, smooth epispore. 



Etymology: Latin plasma, plasm, and pario, divide. 



Plasniopara australis (Speg ) Swingle Trans. Kan. Acad. Sci. XL, 72. 1889. 

 Peronospora australis Speg. Ann. Soc. Cien. Arg. XII., 81. 1881. 

 Peronospora sicyicola Trelease Bot. Gaz. VIIL, 331. 1883. 



Sori hypophyllous, large, effuse; conidiophores elongate, 3-4 times branched 

 above, branches short, thick, placed more or less obliquely; sterigmata 

 short, straight, 2 toothed at apex, 2^-4 /z long; conidia irregularly glo- 

 bose, 11-14^; oospores unknown. 

 In leaves of Micrampelis echinata, Lincoln, Endicott. 



