l886.] NEW-YORK MICROSCOPICAL SOCIETY. V 



Prinits, Linn. 

 obtusifolia , Michx. 

 rubra, Linn. 

 cocci tiea, Wang. 

 tinctorta, Willd. 

 pa I us/ r is, Du Roi, 

 cerris, I>inn. 

 pedunculata, Willd. 

 sessiliflora, Sal. 



On the White Oaks the growth was apparently not 

 as vigorous as on the Black and the Red Oaks, and 

 on none of them was it abundant or vigorous. 

 Castanea vesca, Gaerten. 



Americana, A. De Cond. 

 Not abundant nor vigorous. 

 Ostrya Virginica, Willd. — Very little was found on this tree, 



and that near the base. 

 Betula papyrifera. Marsh. 

 alba, Linn, 



alba, var. populifolia, Spach. 



The growth was confined to the broken patches of bark, 

 or to places where the outside had been taken off. 

 Betula lutea, Michx. f. 

 nigra, Linn. 

 lenta, Linn. 



Not abundant nor vigorous. 

 Alnus serrulata, Willd. 

 incana, Willd. 

 glutinosa, Gcerten. 



Very little was observed on these trees, and at the base 

 only. 

 Salix alba, Linn. 

 Babylonica. 



Very little, and at the base only. 

 Populus grandidentata, Michx. 

 nionilifera. Ait. 

 balsamifera, Linn. 

 Not abundant. 

 Thuja occidentalis, Linn. — Abundant near the base of the tree. 



