72 



Mycologia 



soon became common, and in shaded places where the form on 

 V actinium was near, were abundant and rather conspicuous on 

 the young host plants, Abies balsamea (L.) Mill. It would seem 

 that the collections of last year were made after the period of 

 greatest abundance was past. Collections were made at other 

 places in the province, and the aecial stage is probably common 

 everywhere. 



Peridermium balsameum Peck 



This form is very common on its host throughout this prov- 

 ince. It was found so often associated with Pucciniastrum 

 arcticum (Lagerh.) Tranz. on Rubus idaeus var. aculeatissimus 

 (C. A. Mey.) Regel & Tiling, that it pointed strongly to their con- 

 nection. Pucciniastrum pustulatum and P. minimum are also 

 common but there was no evidence of their connection with the 

 Peridermium. 



Uromyces Peckianus Farlow 



This rust was found common on Distichlis spicata (L.) Greene 

 around the border of a small inlet of the harbor. Aecia were 

 collected in several places in May on A triplex patula L. and in 

 each case the telia of Uromyces Peckianus were found close 

 beside the infected plants. The aecia were very abundant, and 

 examination showed that the teliospores of the Uromyces had 

 germinated. The evidence of connection was so strong that it 

 was decided to try a culture. Telial material had been collected 

 from the same place in the spring and was available for use. 

 This material was placed in a moist chamber and gave excellent 

 germination. Plants of Atriplex were obtained at the seashore, 

 as far removed as possible from the rusted Distichlis, and were 

 placed in pots. Telial material was placed in a moist chamber 

 over night when it was found to be germinating. The teliospores 

 were then transferred with a knife to the leaves of the Atriplex, 

 and the plants were covered with a belljar for a day or two. 

 The sowing was made on May 21. Pycnia were noticed on the 

 plants in one of the pots on June 4, but they probably appeared 

 earlier. Aecia developed in a short time. The infection was 

 rather sparing, only about half a dozen spots with aecia ap- 

 pearing altogether. The second pot of plants showed no infec- 



