124 
Mycologia 
Spores with wall 2.5-4 M thick, coarsely 
verrucose with irregular papillae. 15. P. Comptoniae. 
Branch or stem gradually or abruptly swollen into 
a gall, peridia more or less tortuous, usually 
confluent. 16. P. cerebrum. 
12. Peridermium filamentosum Peck, Bot. Gaz. 7: 56. 1882 
Aecidium filamentosum Farl. Bibl. Index 1 : 44. 1905. 
Peridermium stalactiforme Arth. & Kern, Bull. Torrey Club 33: 
419. 1906. 
0. Pycnia unknown. 
1. Aecia chiefly on branches 6-12 mm. in diameter, not produc- 
ing noticeable swellings, scattered, solitary, cylindrical or sub- 
compressed, 1-2 mm. in diameter, usually elongated, sometimes 
up to 6 or 7 mm. high ; peridium rupturing laterally, with more or 
less evident filament-like processes passing through the spore- 
mass from apex to base of sorus, or when on Pinus contorta and 
its close allies often appearing on larger branches, the sori often 
irregular, shorter and more nearly hemispherical, the processes 
extending from the apex and floor of the aecium only a short dis- 
tance into the spore-mass ; aeciospores oblong, obovate-oblong, 
or ellipsoid, 14-24x23-35^; wall 2.5-4 ^ thick, closely and rather 
coarsely verrucose, some spores showing a smooth area on one 
side toward the base. 
On Pinus ponderosa Dough, Arizona (Pringle). 
On Pinus scopulorum (Engelm.) Lemm., Colorado (Monte 
Vista, 1907, Hedgcock, as on “ P. ponderosa” ; near Mancos, June 
6, 1911, Phillips, Timber & Forest Dis. Sur. no. 9085, as on “ P. 
ponderosa” ; Allen’s Park, July 5, 1911, Spangler; Devil’s Head 
Mountain, Dakin; Pikes Peak, June, 1912, Notestein, as on “ P. 
ponderosa,” used for successful cultures on Castilleja by Hedg- 
cock, see Pbytopath. 2: 176. 1912). 
On Pinus contorta Dough, California (Long), Oregon (Mei- 
nccke, Fort Klamath, May 23, 1912, used for successful cultures 
on Castilleja by the collector). 
On Pinus Jeffrey i Oreg. Com., Nevada (Baker 1351). 
On Pinus Murrayana Oreg. Com., Washington (Suksdorf 643, 
type of P. stalactiforme) . 
Type collected in Arizona, “ on living branches of Pinus pon- 
derosa, July, Pringle” (the type specimen in the N. Y. State Mu- 
