REPORT OF THE STATE ENTOMOLOGIST I907 1 43 



Quercus platanoides (bicolor) (swamp white oak) 



115 Very small pocket-galls, crowded upon the upper side of the 

 leaf. 



Hagen '85, no. 64 Conn. 



Quercus rubra (red oak) 



*ii6 A brown erineum on the under side of the leaf. Trichomes 

 fine, simple, matted. The mites are very numerous, white or pinkish. 



Specimens from the Indian Ladder, Helderbergs (Mr Burn- 

 ham). N.Y. 



Specimens in the State Herbarium from Sand Lake (Professor 

 Peck), and a single loose leaf without data, marked "E. quer- 

 c i n u m probably," have larger patches with some light or whitish 

 portions. See our no. 118, and the following. 



Quercus velutina (black oak) 



*ii7 A velvety red erineum on the under side of the leaf, the 

 young parts greenish. Trichomes simple, matted. 



Specimens in the State Herbarium from Buffalo (Mr Clinton) 

 labeled Erineum quercinum. N.Y. 



Although more brilliantly colored than the preceding it is struc- 

 turally the same with that, with no. 114, and probably also no. iii. 

 Whether these are the true Erineum quercinum I can not 

 determine; see the following. 



Specimens from: South mountain, Catskills. N.Y. 



Quercus sp. 



118 Erineum quercinum Link no. 7, ''in foliis." 



Schweinitz '34, no. 2796 Pa. 



Placed in Phyllerium, having simple trichomes. Persoon '22, 

 no. 5, describes this as ^' cespitulis immersis laxis rufescente- 

 pallidis nitidis. Fila compressa, intricata, mollia. Hab. in fol. 

 Quercus pubescentis. Phyllerium quercinum 

 Kunze." This agrees passably with the preceding forms referred 

 to it by Professor Peck (nos. 114, 116, 117). 



1 19 Erineum quercus-cinereae Schwein. (no. 6) . 



Schweinitz '34, no. 2801 N.C. 



Placed in Phyllerium, the trichomes therefore simple. 



