BIOLOGICAL PAPERS. 149 



26. Puccinia podophylli Schw. I, III. 



On leaves and stems of Podophyllum peltatum L., I and III, May 10, 

 1902; and III, May 27, 1902. 



While collecting the fficidia on May 10, some of the plants of Podophyllum 

 were pulled up, and it was observed that quite a few of them were in- 

 fested with the sori of the teleutospores of the rust. In each case the 

 sorus was between the rhizome and the surface of the ground. Under- 

 ground sori were again found on the 27th. 



27. Puccinia polygoniamphibii Pers. II. 



On leaves of Polygonum convolvulus L., August 11, 1902. 



28. Puccinia rubigo-vera (D. C.) Wint. II, III. 



On leaves of Hordeum jubatum L., May 29, 1902. II. 

 On leaves of Triticum vulgare II, May 28, 1902 ; on culms and leaves, III, 

 August, 1902. 



29. Puccinia silphii Schw. III. 



On stem and leaves of Silphium integrifolium Michx., June 21, 1902. 



30. Puccinia sorghi Schw. II. 



On leaves of Zea mays, July, 1902. 



31. Puccinia vernoniaj Schw. II, III. 



On leaves of Vernonia baldwinii Torr. August 6, 1902. 



32. Puccinia viote (Schum.) D. C. I, II, III. 



On leaves of Viola pubescens Ait., I, May 3, 1902; II, III, May 27, 1902. 

 On leaves of Viola cucullata Ait., II, III, May 29, 1902. 



33. Puccinia windsorite (Schw.) I (^cidium pteliae B. & C.) 



On leaves and rarely on fruits of Ptelia trifoliata L., June 15, 1901; June 

 21, 1902. 

 This rust is found especially abundant on the leaves of the very young shrubs, 

 and is usually present wherever its host i* 



34. Puccinia* xanthii (Schw.) III. 



On leaves of Ambrosia triflda L., July 15, 1902. 



On leaves of Xanthium canadense Mill., July 31, 1902. 



35. Pucciniastrum crotonis (Cke.) De Toni. I, II, III. 



On leaves of Croton monanthogynus Michx., I, Aug. 18, 1900; II, III, 



Oct. 26, 1900. 

 On leaves of Croton capitatus Michx., I, Aug. 18, 1900; III, Oct. 26, 1900. 



36. Uredo gaurina Peck. 



On leaves and stems of Gaura biennis L., Aug. 6, 1902. 



37. Uredo nitens (Schw.) De Toni. 



On leaves of Rubus sp., May 3, 1902. 



38. Uromyces astragali (Opiz.) Sacc. II. 



On leaves of Astragalus carolinianus L. (A. Canadensis L.), Aug. 13, 

 1902. Sori very inconspicuous. 



39. Uromyces caladii (Schw.) Farl. I, II, III, 



On leaves of Arissema dracontium (L.) Schott, I {^eidium caladii 

 Schw.), and II, May 5, 1902 ; and III, May 27, 1902. 



On leaves of Arissema triphyllum (L.) Torn, I, May 30, 1902; and III, 

 May, 1901. 



