124 



Mycologia 



a browning of the leaves, casting of the leaves, and developing of 

 suckers. 



That the damage was so extensive in Central Park is to be 

 accounted for partly by the character of the soil, which for the 

 most part is hard and packed with the tramp of many feet. This 

 condition, coupled with the absence of leaf mulch, rendered both 

 radiation and evaporation more rapid from the surface, and 

 therefore cold and drought penetrated much more readily and 

 deeply than would be the case in the normal forest, where the soil 

 is a deep rich humus covered with a blanket of decaying leaves. 



Of susceptible species noted in other places, the sweet cherry, 



Pruniis avium L., was the most conspicuous, and trees of this 



species killed outright were a very common sight. Liquidamhar 



trees at Mt. St. Vincent and on Long Island were also notable 



sufferers. Many Ailanfhtis trees and especially the Lombardy 



poplar — the latter in the marginal park between the Hudson and 



Riverside Drive — were entirely killed. It is interesting to recall 



that Liquidamhar is here near the northern limit of its range. 



New Haven, 



Connecticut. 



Explanation of Plate 



Fig. I. Pin oak {Querents palustris Muench.) at Englewood Heights, N. 

 J., showing cankerous growths caused by Pyropolyporus Everhartii (Ellis & 

 Gall.) Murr. This and the following photographs taken by Mr. Louis Buhle, 

 Brooklyn Botanic Garden. 



Fig. 2. Sweet birch {Betula lenta L.) with canker caused by Creonectria 

 coccinea (Pers.) Seaver. On terminal moraine north of Hollis, L. I. 



Fig. 3. Fruiting body of Glohifomes graveolens (Schw.) Murr. from liv- 

 ing red oak (Quercus rubra L.) in a forest near Mt. Loretto, Staten Island. 

 One half natural size. 



Fig. 4. Spores of Creonectria coccinea (Pers.) Seaver. a, macroconidia ; 

 h, ascospores. X about 300. 



