Arthur and Kern: Peridermium 435 



herbarium N. Y. State Museum, Albany) ; Sailor's Encampment, 

 Michigan, August 5, 1899, E. T. Harper j/6, communicated by 

 E. W. D. Holway ; Isle Royal, Michigan, September 4, 1901, 

 Stunts & Allen (in Ellis & Everh. Fungi Columb. no. 1620) ; Isle 

 au Haut, Maine, August 20, 1900,/. C. Arthur. 



On Abies lasiocarpa (Hook.) Nutt. (A. sitbalpina Engelm.), 

 Yellowstone Park, Wyoming, August, 1884, Frank Tweedy; 

 Black Mountain, Manti, Utah, 8000 ft. alt., August 6, 1895, Mar- 

 cus E. Jones ; Battle Lake, Wyoming, August 18, 1897, Aven 

 Nelson 4.24+ ; Mystic Lake, Bozeman, Montana, 7000 ft. alt., 

 August 1, 1898, /. IV. Blankinship, communicated by E. W. D. 



Holway; Brush Creek, Utah, 9000 ft. alt., July 27, 1900, Pam- 

 viel & Stanton 642 ; Aquarius Plateau, Utah, August 5, 1905, 

 Rydberg & Carlton 7462. 



On Abies rcligiosa Lindl., Orizaba, Mexico, 1901,/. N. Rose 

 575 J (specimen in herbarium of U S. Dept. Agric). 



A wide-spread and conspicuous species. It appears to be 

 identical in both gross appearance and microscopic structure with 

 the European form of the same name, which through the nu- 

 merous cultures by Klebahn and Fischer has been proven to be 

 the aecial stage of Melampsorella Ccrastii (Pers.) Schrot. The 

 uredinial and telial forms of this species on Alsine, Sttilaria and 

 Cerastium are very inconspicuous, but have been collected a few 

 times in the United States. 



28. Peridermium balsameum Peck, Rep. N. Y. State 



Mus. 27: 104. 1875 

 Aeddiiim balsameum Dietel, in Engler & Prantl, Pflanzenfam. 



I 1 ** : 78. 1897. 



0. Pycnia hypophyllous, few, scattered, punctiform, inconspicu- 

 ous, honey-yellow, small, subcuticular, extending into the lateral 

 walls of epidermis, in section hemispherical, ico-130 ti broad, 



35-50/; high. 



1. Aecia from a limited mycelium not changing form of leaf, 

 hypophyllous in two irregular rows on yellowish spots occupying 

 a part or all of a leaf, white even before spores are discharged, 

 deep-seated, cylindrical, or somewhat flattened laterally, rather 

 small, 0.2-0.5 nlm - across, opening at apex; peridium colorless, 

 margin erect, erose or somewhat lacerate, cells overlapping, with 

 medium thick walls, 2-4 /i, the outer smooth, inner somewhat 



