PLANTS OF NORTH ELBA 227 



Puccinia Circaeae Pers. 

 Living leaves of small enchanter's nightshade, Ch^caea alpina. Northern 

 entrance to Indian pass. August. 



Puccinia Tiarellae B. df C. 

 Living leaves of false mitrewort, Tiarel/a cordifolia. Wood farm. 

 August. This is thought by some to be the same as P. Heucherae Schw. 



Puccinia pori^hyrogenita Curt. 



Living leaves of dwarf cornel, Comiis Canadensis. Woods east of 

 Brewster farm. August. 



Puccinia mesomegala B. df C. 

 Living leaves of northern clintonia, Clintonia borealis. Old Keene 

 road. June and July. 



Triphragmium clavellosum Berk. 



Living leaves of wild sarsaparilla, Aralia niidicaulis. Ausable valley. 



August. 



Peridermium balsameum Pk. 



Living leaves of balsam fir. Woods east of Brewster farm. August. 



This parasitic fungus discolors the affected leaves but they attain their 



usual size. 



Peridermium elatinum {A. 6^ ^.) K. &• S. 



Living leaves of balsam fir. July. This fungus affects both branches 

 and leaves. It causes an abnormal development of the branch attacked, 

 increasing greatly the number of shoots and making a dense cluster 

 commonly known as crow's nest. All the leaves on an affected branch 

 show the presence of the fungus and attain only about half their usual 

 size. Generally the attack is limited on a tree to a single branch and its 

 branchlets, but the fungus is perennial and persists till the branch dies. 



Peridermium decolorans Pk. 



Living leaves of spruce trees. Top of Mt Mclntyre. July and 

 August. This was made a variety of P. abietinum A. & S. by Thumen, 

 but I see no good reason for so domg. 



Peridermium Engelmanni Thum. 



On spruce cone scales. Rare. In thin woods southwest of North 

 Elba post office. August. Only a few cones on a tree were affected. 



