315 



proving conclusively that the fungus is autoecious and that telia only are 

 included in the life cycle. 



6. COLEOSPORIUM SoLlDAGiNis (Schw.) Thiini. Bull. Torrey Club 6:216. 

 1878. 

 Uredo Solidaginis Schw. Schr. Nat. Ges. Leipzig 1:70. 1822. 

 Periderminum acicolum Und. & Earle, Bull. Torrey Club 23:400. 

 1896. 



Peridermiuni vwntanum Arthur & Kern, Bull. Torrey Club 33:413. 

 1906. 



On Pinaceae: I, 

 Pinus rigida Mill.— Seaford, June 5, 1908, (2066, 2094) ; Har- 

 rington, June 5, 1908 (22.57). 

 On Carduaceae: II, III. 



Solidago canadensis L. — Newark, September, 1888, F. D. 

 Chester; Seaford, July 9, 1907, (1644) ; Clayton, July 24, 1907, 

 (1704) ; Lewes, Aug. 14, 1907, (1697, 1701). 

 Solidago rugosa Mill., Lewes, Aug. 14, 1907, (1698). 

 Aster paniculatns Lam. Newark, October, 1907, (2265, 2248). 

 The life history of this species was first worked out by Clinton 

 (Science N. S. 25:289. 1907. Ann. Rep. Conn. Exp. Sta. 1906:320. 1907; 

 1907:375. 1908). He successfully infected Solidago rugosa with aecio- 

 spores of Peridermiuni acicolum on Phms rigida. The aecial material 

 used was collected in three localities in Connecticut and three trials were 

 made, all of which resulted in the development of uredinia. Telia fol- 

 lowed in two cases. 



More recently Hedgcock (Phytopath. 6:65. 1916) and Wier and 

 Hubert (Phytopath. 6:68. 1916) working independently, have shown that, 

 in Montana, the species under discussion has for its aecial stage a 

 Peridermiuni common in the west on the needles of various pines, known 

 as P. mo7itanum Arth. & Kern. Hedgcock sowed aeciospores collected on 

 Pinus contoria in Montana on various hosts and obtained the development 

 of aecia and telia on Aster consjncuous. Wier & Hubert also sowed 

 aeciospores from the same host and State on a number of local hosts for 

 Coleosporium and obtained infection resulting in aecia on Solidago cana- 

 densis, S. missouriensis and Aster laevis geyeri. 



A review of the present knowledge with reference to this species can 

 be found in Phytopathology 8:324. 1918. 



