PERIDERMIUM. 



417 



The soft hypertrophied shoots are eaten. They occur chiefly 

 in Scandinavia, but recently were observed by Gobi and Tranzschel 

 in the neighbourhood of St. Petersburg.^ 



Fio. 252. — Aeddium coru^cans on malformed shoots of Spruce. The compact 

 abnormal shoots thickly covered with white aecidia contrast strongly with the 

 normal portions, (v. Tubeuf phot, from material presented by Prof. Fries, 

 TJpsala.) 



P. Engelmanni Thlim. On cones of Picea Smithiana. (U. S. 

 America.) 



P. piceae Barcl. On needles of Picea Smithiana. 



P. Peckii Thiim. On needles of Tsuga canadensis (U.S. America). 



P. balsameum Peck. On needles of Abies balsamea (U.S. America). 



P. ephedrae Cooke. On Ephedra in U.S. America. 



P. cedri Barcl. On needles of Cedrus Deodara in India. 



P. Balansae Corn. On leaves of hammara ovata in New Caledonia. 



^Also reported at Haslemere (Britain), GrevUlea, xix., 1890. 

 2d 



