DESCRIPTION OF AMERICAN UREDINE.E. 53 



Exsic. Ellis, N. A. E. 1456. 1847. Thuem. Myc. Univ. 



1525- 



Europe, Siberia, N. Am. 



13. PucciNiA MESNiERiANA T/iiiciii. (1877. Flora p. i75- 

 Myc. Univ. No. 834.) 



13a. On Rhamniis crocca Nutt. Near C'amp Badger. 

 Calif., Holway. 



13b. On Rhaumiis crocea Nutt. Pasadena, Calif., Mc- 

 C late /lie. 



Orig. Descr. "4<^3- Puccinia niesiiieriana Thiiein. nox a spec. P. acer- 

 vulis amphigenis, plerumque hypophjllis, sa;pe niarginalibus et 

 petiolicolis, sparsis, orbiculato-elevatis, verruca^formibus, induratis, 

 epidermide tectis, dein erumpentibus, sine macula, vel in pagina su- 

 periore maculum nigro-violaceum fornians, nitido-atris; sporis fas- 

 ciculatis, longe-clavatis, medio constrictis, cellula superior oblique 

 quadrangula, 15mm. crass., apice imposita, obtusa, siepe subcoro- 

 nata ut in P. coronata Cda.; cellula inferior dupio longiore, basi, 

 angustata, 12mm. crass., episporio Isevi, tenui, vertice subincras;- 

 sato, 50mm. long., pedicello basi verticeque dilatato, medio angus- 

 tato, 35mm. long., 3-4 mm. crass., hj'alino; fuscis; paraphysibus 

 nullis. Lusitania: Coimbra ad Rliamiii alafcriii Lin. folia viva. 

 Julio, 1876. Raro; leg. P. (j. Mesnier." 



Spots pale or dark, depressed; sori amphigenous, mostly 

 bypopbyllous, large, round, or on the midribs, elongated, black, 

 surrounded by the ruptured epidermis; spores reddish-brown, 

 persistent, clavate, lower cell longer and paler, apex thickened 

 and mostly terminating in 1-7 digitate processes, 48 7 6/^ by 

 12-16/^; pedicel short, stout, persistent. Plate II., Fig. 13. 



In the original specimens, Thuem. Myc. Univ., the spores 

 are occasionally 3-celled, the digitate processes are not as prom- 

 inent, and many of the spores lack them entirely. 



An allied species found in Abyssinia o\\ Rhamnus staddo R., 

 Puccinia schzveinfurthii (P. Henn.) P. Magnus, causes the so 

 called "witches' broom'' distortion of the host. 



14. Puccinia porpiivrogenita Curl. ( 1876. In Thuem. 

 Myc. Univ. No. 545.) 



14. On Corniis caiiadcnsi:> L., Vermilion Lake. Minn., 

 Artlnir & Holivay. 



