41G Arthur and Kern: Peridermium 



eastern states from South Carolina to Mississippi. It is an espe- 

 cially large and conspicuous form, usually passing under the name 



Peridermium orientate. The type as stated by Bosc, was col- 

 lected in South Carolina on Pinus palustris. Although it is 

 probably no longer in existence, his description is so explicit and 

 full, that together with the illustration, lx.pl. 6, fig. Ij, no doubt 

 can exist of the application of the name. 



5. Peridermium intermedium sp. nov. 



0. Pycnia amphigenous, scattered, noticeable, dehiscent by a 

 longitudinal slit, subcorticular, 0.3-0.4 mm. broad by 0.5-0.75 mm. 



long, lovv-conoidal, 65-80 p. high. 



1. Aecia amphigenous, from a limited mycelium, scattered, on 

 discolored spots occupying part of a leaf, erumpent from longitu- 

 dinal slits, flattened laterally, tongue-shaped, of medium size, 1. 5— 3 

 mm. long by 0.8-1.5 mm. high, rupturing along the apical line; 

 peridium colorless, rather firm, cells 35-50 ti long, somewhat 

 longer than broad, overlapping, walls transversely striate, inner 

 coarsely verrucose, rather thick, 6—9 ji 9 outer less rough and of 

 about equal thickness; aeciospores ellipsoid, 16—20 by 23-29 //, 

 wall colorless, evenly and moderately verrucose, 2.5—3.5 fjt thick. 



On leaves of Pinus echinaia Mill. {P. viitis Michx.), Perryville, 

 Missouri, May, 1883, C. H. Dcmctrio{\\\ Rabenhorst-Winter, Fungi 

 Europ. no. jj/ja) ; Cadet, Washington County, Missouri, May, 

 1890, J. G. Barlow 15J3 (specimen in herbarium of U. S. Dept. 

 of Agric.) ; Garrett Park, Maryland, May 29, 1891, B. T. Gallo- 

 way; Eureka Springs, Arkansas, May 2^ t 1906, H. von Schrenk. 



This species is intermediate in most of its gross and micro- 

 scopic characters between Per. carnetim and Per. Rostrupi, and as 

 might be anticipated the determination of collections is likely to be 

 uncertain in some cases. The first collection listed above is taken 

 as the type. 



6. Peridermium Rostrupi Ed. Fischer, Bull. Soc. 



Bot. France 41 : clxxi. 1894. 



0. Pycnia amphigenous, scattered, numerous, dehiscent by a 

 longitudinal slit, noticeable, 0.2-0.4 nim. broad by 1-2 mm. long, 

 low-conoidal, subcorticular, 90—1 10 /i high. 



1. Aecia amphigenous, from a limited mycelium, scattered on 

 discolored spots occupying part of a leaf, erumpent from longi- 

 tudinal slits, flattened laterally, tongue-shaped, 1-3 mm. long by 



