134 



Journal of Agricultural Research 



their hosts. In this respect their development is similar to that of 

 plants of species of Phoradendron. 



Both C. umhellata and C. pallida very commonly are associated with 

 and parasitic upon species of Vaccinium, but are not at all dependent 

 upon this genus for host plants. This has especially been noted in the 

 case of C. pallida in the States of Colorado, Montana, Nebraska, South 

 Dakota, and Wyoming, and in C. umhellata in the States of Con- 

 necticut, Maryland, Michigan, Minnesota, New Jersey, New York, 

 Pennsylvania, Vermont, Virginia, and Wisconsin, and the District of 

 Columbia. Plants of both species are parasitic upon a great variety of 

 plants belonging to widely different sections of the Spermatophyta. 

 No attachment to plants of any member of the Pteridophyta has been 

 noted. . 



C. umhellata has been found by the writer as a parasite on the roots 

 of the following species of plants in the Eastern States : 



Acer ruhrum L. 



Achillea millefolium L. 



Andropogon virginicus L. 



Angelica villosa (Walt.) B. S. P. 



Antennaria plantaginifolia (L.) Richards. 



Aster ericoides L. 



Aster macro phylliis L. 



Aster patens Ait. 



Aster undulattis L. 



Baptisia tinctoria (I,.) Br. 



Betula nigra L. 



Beiula populifolia Marsh. 



Carex sp. 



Castanea dentata (Marsh.) Borkh. 



Chimaphila umhellata (L.) Nutt. 



Chrysopsis mariana (L.) Nutt. 



Comptonia peregrina (L.) Coulter. 



Danthonia compressa Austin. 



Fragaria americana (Porter) Britton. 



Fragaria virginiana Duchesne. 



Gaylussacia frondosa (L.) T. and G. 



Hieracium venosum L. 



lonactis linariifolius (L.) Greene. 



Lespedeza violacea (L.) Pers. 



Lysimachia quadrifolia L. 



Meibomia paniculata (L.) Kuntze. 



Panicum sp. 



Poa compressa L. 



Poa pratensis L. 



Populus tremuloides Michx. 



Potentilla monspeliensis L. 



Quercus coccinea Muenchh. 



Quercv^ digitata (Marsh.) Sudw. 



Quercus marilandica Muenchh. 



Quercus nana (Wood) Britton. 



Rhus copallina L. 



Rosa blanda Ait. 



Rosa canina L. 



Rubus canadensis L. 



Rubus procumhens Muhl. 



Rubus villosus Ait. 



Solidago bicolor L. 



Solidago caesia L. 



Solidago juncea Ait. 



Solidago nemoralis Ait. 



Solidago speciosa Nutt. 



Spiraea salicifolia L. 



Vaccinium atrococcum (A. Gray) Heller. 



Vaccinium nigrum (Wood) Britton. 



Vaccinium vacillaiis Kahn. 



In addition to the foregoing and incomplete list there must be added 

 at least three unidentified species of grasses. 



During the last three years a number of attempts, with varying suc- 

 cess, have been made at Washington, D. C, to grow plants of C. um- 

 hellata and C. pallida, both by germinating the seed and by transplanting 

 rootstocks to beds and pots in greenhouses. In every case where living 

 rootstocks unattached to host plants have been transplanted to pots or 



