112 



Deciduous Trees and Shrubs 



*Betula populifolia Marsh. 



Carya laciniosa (Michx. f.) Loud. 



Carya ovata (Mill.) K. Koch 



Castanea dentata (Marsh.) Borkh. 

 *Cephalanthus occidentalis L. 



Platanus occidentalis L. 



Populus grandidentata Michx. 



Prunus serotina Ehrh. 



Quercus alba L. 



Quercus coccinea Muench. 



*Quercus ilicifolia Wang. 

 * Quercus prinoides Willd. 



Quercus stellata Wang. 



Quercus velutina Lam. 

 *Rhus copallina L. 



Rhus glabra L. 



Robinia Pseudo -acacia I 

 *Salix cor data Muhl. 

 *Salix pentandra L. 



Sassfras variifolium 

 (Salisb.) Ktze. 



Ericaceous Shrubs 



*Gaylussacia baccata (Wang.) C. Koch 

 Kalmia latifolia L. 

 *Leucothoe racemosa (L.) Gray 

 *Lyonia mariana (L.) D. Don 



Endotrophic: 



Deciduous Trees and Shrubs 

 Acer rubrum L. 

 *Aronia arbutifolia (L.) L.f. 

 *Amelanchier canadensis (L.) Medic. 



Ericaceous Shrubs 



Myrica carolinensis Mill. 

 *Clethra alnifolia L. 

 *Vaccinium stamineum L. 



Vaccinium vacillans Kalm. 



The endotrophic type of mycorrhizae was found upon the 

 rootlets of seven species in the collection. Externally these 

 showed bead-like swellings and swollen tips and internally in- 

 tracellular granular masses, hyphae, fragments of hyphae and 

 spore-like bodies. 



The remaining twenty-nine species harbored the ectotrophic 

 type. The conifers were characterized by the dichotomously 

 branched short roots and coralloid clusters, and the deciduous 

 trees and shrubs by coralloid clusters and unbranched short 



