140 University of Calif orma Puhlicatians in Botany [Vol.7 



RAVENELIA uerk. 

 Card. Chron., p. 132, 1853. 

 Uredinia erumpent, without peridiuin ; iirodiniospores borne singly 

 on pedicels, wall colored. Teliospores fascicled on compound stalks, 

 one- or two-celled, forming heads bordered by hyaline cysts, 



ISO. Ravenelia arizonica Ell. and Ev. II, III 



Bull. Torr. Club, vol. 22, p. 363, 1895. 

 On Prosopis juliflora (Sw.) DC, San Diego (Bethel). 



181. Ravenelia versatilis (Peck) Diet. II, III 



Hcdwigia, vol. 33, p. 368, 1894. 

 On Acacia Gregii Gray, San Bernardino (Toumey), Banning 

 (Parish). 



TRANZSCHELIA arth. 



Result. Sc'i. Cong. Bot. Vienue, p. 340, 1906. 



Aecia cylindrical ; aeciospores globoid ; wall colored. Uredinia 

 erumpent ; urediniospores borne singly on pedicels mixed with para- 

 pliyses. Telia erumpent, pulverulent; teliospores attached to a com- 

 mon stalk by short inconspicuous pedicels. 



182. Tranzschelia punctata (Pers.) Arth. 0, I. II, III 



Ann. Bot. Usteri, vol. 20, p. 135, 1796; Arthur, op. cit. 



Aecia not known from California but found on various species of 

 Hepatica, A^iemone and Thalictrum {Aecidiiim piuictatum Pers.) in 

 the eastern United States. 



Uredinia and more rarely telia on cultivated peach, plum, prune, 

 almond, and apricot, especially in the southern part of the state, but 

 widely distributed. This is the "prune rust" which is sometimes the 

 source of considerable losses to fruit growers. 



UREDINOPSIS JIAGN. 



Atti Cong. Bot. Geneva, p. 167, 1893. 



Aecia similar to those of Coleosporium, found on leaves of species 

 of Ahies. Uredinia larger and more conspicuous than the aecia, the 

 agglutinated spores ejected from the delicate peridium in a long 

 mucilaginous filament. Telia indehiscent; teliospores four-celled, with 

 thin wall. 



