206 BROOKLYN BOTANIC GARDEN MEMOIRS 



This species differs from C. Ahietis in the narrower, somewhat 

 smaller spores which do not long remain in chains but soon break 

 apart. No evidence of germination has been seen in any of the col- 

 lections. This is the only American representative of the genus as 

 restricted by Arthur. (Result Sci. Congr. Bot. Vienne 338. 1906.) 

 It is known to the writer otherwise only from single collections from 

 British Columbia and Idaho. It is doubtless not uncommon in the 

 northwest. 



7. Croxartium filamentosum (Pk.) Hedgcock, Phytopath. 2: 177. 

 1912. 



Peridermnim filamentosum Pk. Bot. Gaz. 7: 56. 1882. 



Uredo coleosporioides Dietel & Holway, Erythea i : 247. 1893. 



Peridermium stalactijorme Arth. & Kern, Bull. Torrey Club 33: 

 419. 1906. 



Cronartium coleosporioides Arth. N. Am. Flora 7: 123. 1907. 

 On Pinaceae: I. 



Pinus contorta Dougl. — Scotts, Anna Creek, Klamath Co., May 23, 

 1912, E. P. Meinecke, used for inoculation on Castilleja miniata; Gold 

 Center, June 20, 1914, H. F. Wilson, 1856; North slope Mt. Hood, 

 elev. 3,000-4,000 ft.; Aug. 7, 1914, 3332; Sumpter, Baker Co., 

 May, 1916, J. R. Weir. 

 On Scrophulariaceae: II, III. 



Castilleja sp. — North slope Mt. Hood, 3,000-4,000 ft., Aug. 7, 

 1914, 1612, 1615 (collected near jjj2); Ashland Toll House, Jackson 

 Co., Sept. 27, 1913, E. P. Meinecke, Cr D 22. 



Hedgcock (1. c.) was the first to publish a record of connection 

 of Peridermium filamentosum with a Cronartium on Castilleja by cul- 

 tures. He considered this distinct, however, from Cronartium coleo- 

 sporioides, which Meinecke had cultured in 191 1 (Phytopath. 3: 167- 

 168. 1913) and shown to have for its aecial form P. stalactijorme. 

 Meinecke's culture material was collected in Klamath Co., Oregon. 



Further culture work has been carried on by W^eir and Hubert 

 (Jour. Agr. Research 5: 781-785. 1916) in which it is shown that 

 the gall-forming Peridermium on Pinus contorta which has previously 

 been commonly referred to P. Harknessii Moore is but a form of P. 

 filamentosum. 



All the records of the aecial stage given above are of the gall- 

 forming type. The Hood River material was collected in the im- 

 mediate vicinity of the telial form on Castilleja. 



8. Cronartium pyriforme (Pk.) Hedge. & Long, Alt. Stage Peri- 

 dermium pyriforme 3, 1914. 

 Peridermium pyrijorme Peck, Bull. Torrey Club 6: 13. 1875. 



