106 PROCEEDINGS OF THE ACADEMY OF [March^. 



Acidity. — 



5+ X 



4 X 



3 



2 X X 



1 XX 



300 100 30 10 3 1 



The optimum soil reaction of this species is subacid. The most 

 acid reactions tabulated were observed in swamps north of Dover, 

 N. J., and in southern Delaware. The least acid was noted in Lan- 

 caster County, Pa., at the contact of sandstone and limestone forma- 

 tions, this Gaylussacia, along with one Vacciniuin, extending a short 

 distance over on to the limestone side. 



Vaccinium stamineum L. 



Habitat. — Dry and occasionally moist upland peat. 



Acidity. — 



X 



30 10 3 1 



The optimum soil reaction for this species is subacid. The least 

 acid reaction tabulated was observed in upland peat on decomposed 

 diorite-gneiss rock southwest of Allentown, Pa. 



Vaccinium pennsylvanicum Lamarck. 



Habitat. — Dry and occasionally moist upland peat. 



Acidity. — 



30 10 3 1 



The optimum soil reaction for this species is apparently subacid. 

 In the White Mountains (indicated by the o in the table) its soils 

 are mediacid, but the plant there is distinct in several respects from 

 the one found in the Middle Atlantic States. In Gray's Manual 

 this northern form is distinguished (as var. angustifolium (Ait.) 

 Gray). The lowest acidities tabulated were observed near Wilkes- 

 barre. Pa., and on a sample of soil kindly submitted by Professor 

 George S. Perry of the Pennsylvania Forest Academy from near 

 Mont Alto. 



