Arthur and Kern: Peridermium 413 



tents bright-orange when fresh, wall colorless, finely verrucose, 

 2.5-3 /i thick. 



On leaves of Pinks sp., St. Augustine, Florida, March 27, 

 1903, E. W. D. Hokvay. Only one collection has been made. It 

 occurred in abundance, but only reached- to about four feet above 

 the ground. The host appeared to be the common long-leaved 

 pine {P. Taedci) ; but the microscopic structure of the leaves does 

 not agree well with that of authentic collections of this species. 

 No cones were found. The exact determination of the host must, 

 therefore, remain in doubt for the present. The peridium of this 

 species is so fragile and short that the fungus has the general ap- 

 pearance of a caeoma, and in the field might easily be mistaken 

 for one. 



2. Peridermium montanum sp. nov. 



0. Pycnia chiefly hypophyllous, rather numerous, scattered, no- 

 ticeable, subcorticular, dehiscent by a longitudinal slit, large, 0.3- 

 0.5 mm. broad by 0.5-1 mm. long, low-conoidal, 55-65 fi high. 



1. Aecia from a limited mycelium, chiefly epiphyllous, rather 

 numerous on yellowish spots occupying part or rarely all of the 

 leaf, erumpent from a narrow slit, flattened laterally, 1 — 1.5 mm. 

 long by 0.5-0.8 mm. high, rupturing irregularly ; peridium color- 

 less, delicate, cells separating readily, 55—65 /^ long, overlapping, 

 outer and inner walls about same thickness, 3-5 /i, outer minutely 

 verrucose, inner moderately verrucose ; aeciospores oblong to 

 linear-oblong, 16-24 by 3 2 ~45 fa wa ^ colorless, rather thin, 2-3 /*, 

 closely and rather coarsely verrucose. 



On leaves of Pinus scopidorum (Engelm.) Lemm., Rimini, Mon- 

 tana, June 24, 1889, F. D. Kelsey (type, specimen in herbarium of 

 N. Y. Bot. Garden). 



On leaves of Pinus Mitrrayana Oreg. Com., Chiquash Moun- 

 tains, Skamania County, Washington, August 12, 1886, W. N. 

 Suksdorf J02 ; Rocky Mountains (Canada?), July 3, 1885,/. M. 

 Macoiin ; Chiquash Mountains, Skamania County, Washington, 

 July 22, 1901, W. N. Suksdorf 64$, communicated by E. W. D. 

 Holway; Bozeman, Montana, June 26, 1900, /. IV. Blankinslup, 

 communicated by E. W. D. Holway. 



3. Peridermium acicolum Undervv. & Earle, Bull. 



Torrey Club 23: 400. 1896 



O. Pycnia amphigenous, numerous, scattered, noticeable, sub- 

 corticular, dehiscent by a longitudinal slit, 0.3-0.5 mm. broad by 

 0.5-0.8 mm. long, low-conoidal, 80-100 fi high. 



