1919] Blasdale: Ureditiales of California 115 



NYSSOPSOKA AETH. 



B&sult. Sei. Cong. Bot. Vienne, p. 342, 1906. 



Telia erumpent; teliospores three-celled by oblique partitions, lat- 

 erally flattened ; walls deeply colored, spinous. 



34. Nyssopsora echinata (Lev.) Arth. Ill 



Ann. Sci. Nat,, ser. 3, Bot., vol. 9, p. 247, 1848; Arthur, op. cit. 

 On Oenanthe calif arnica Wats., San Francisco, Santa Cruz (Thom- 

 son) ; on Selinum pacificum Wats., Santa Rosa and Hoopa Valley. 



PEBIDERMIUM 



Under this form genus are grouped those aecial forms for which 

 no other stages are known and which resemble the aecia of Coleo- 

 sporium and Cronartium. 



35. Peridermium californicum Arth. and Kern 



Mucologia, vol. 6, p. 118, 1914. 



On Finns radi-ata Don., Monterey (Bethel). This is believed to be 

 the aecial stage of Coleospormm Madiae by Meinicke, but the data 

 upon which this conclusion is based has not yet been published. 



36. Peridermium Ephedrae Cooke 



Indian Forester, vol. 3, p. 95, 1877; Arthur and Kern, Bull. Torr. Club, 

 vol. 33, p. 420, 1906. 



On Ephedra calif ornica Wats., San Diego (Bethel), Riverside 

 County (Parish). Conspicuous on account of its large, orange colored 

 spore masses; see Standley (Plant World, vol. 13, p. 61, 1909). 



PHRAGMIDIUM LINK. 



Ges. nat. Freunde, Berlin, vol. 7, p. 30, 1915. 



Aecia erumpent, usually indefinite and surrounded by paraphyses. 

 Aeciospores in chains, globoid, with colorless walls. Uredinia erum- 

 pent, usually with paraphyses ; urediniospores borne singly on pedicles. 

 Telia erumpent, usually definite and without paraphyses; teliospores 

 two-celled or more by transverse septa with two or more lateral pores. 



37. Phragmidium Anderson! Shear. I, II, III 



Bull. Torr. Club, vol. 29, p. 453, 1902. 



On Potentilla fruticosa L., Mount Eddy, Siskiyou County (Cope- 

 land). 



