216 



Mycologia 



to the Amelanchier form we most fortunately found a very small 

 weather-beaten plant of Amelanchier not over six or eight inches 

 high, bearing at the time about a score of leaves, and every leaf 

 thickly covered with the characteristic horn-like aecia. No other 

 plants of Amelanchier infected with the same sort of aecia could 

 be found in the region, although they often bore aecia of other 

 species. The plant in question did not occur near Juniperus 

 Sihirica, although that juniper was very common, but much to 

 our surprise was associated with Juniperus horizontalis, a trailing 

 form of the red cedar, that produces circular mats up to fifty feet 

 in diameter and rises only three to five inches from the ground. 

 No other form of red cedar occurs in the region, and even this 

 one is not abundant. In the midst of one of these red cedar 

 mats, some six feet in diameter, we found on September 7 the 

 heavily infected Amelanchier just mentioned. It was too late in 

 the season to hope to find telia. We did, however, detect some 

 remains of what appeared to be telial galls on the larger branches 

 close to the infected Amelanchier, from which the aecia might 

 have been derived. It was to ascertain if telia subsequently 

 developed on this particular red cedar, and, if so, to secure some 

 for cultures, that Mr. Kern again visited Leland. The highly 

 satisfactory results of the trip are given later in this paper under 

 the report of cultures of species never before recorded. 



In this connection an error in the report of cultures for 1908 

 should be pointed out. The record of Gynino sporangium Davisii 

 Kern,^ should have been listed among " Successful cultures re- 

 ported for the first time." Studies have since shown that the 

 form grown by Dr. Ed. Fischer of Bern, Switzerland, and which 

 he subsequently named G. Amelanchieris is quite distinct from 

 G. Davisii. The aecial host of the European form is a true 

 Amelanchier (service-berry), and not an Aronia (choke-berry). 

 The assumption that it was an Aronia, a genus not represented in 

 the Swiss flora, came from confusion in interpreting the syn- 

 onymy. The very similar aecia on Amelanchier in America pro- 

 duce a gall on the stems of the red cedar ,as the present season's 

 work has demonstrated, while the aecia on Amelanchier in Europe 

 produce small sori on the leaves of the common juniper. The 



^ Mycol. 1 : 241-242. 1909. 



