REPORT OF THE STATE ENTOMOLOGIST I907 1 29 



41 A pocket ( ?) gall, chiefly on the upper side of the leaf, often 

 confluent. 



Walsh '64, p.6o8, and '67, p.256 111.? 



(Hagen '85, p.29) 



Betula papyrifera (paper birch) 



42 A yellowish white to brownish erineum forming large patches 

 betw^een the ribs on the under side of the leaf. Trichomes capitate, 

 rather long. 



Garman '92, no. 14 N.H. 



Jarvis '07, p. 62, fifth sp. Ont. 



*43 A nodular pocket-gaH, occurring upon both faces of the leaf; 

 yellowish or reddish to purplish ; those on the under surface finely 

 pubescent. With preceding. 



Garman '92, no. 15 N.H. 



Jarvis '07, p.6o, fourth sp. Ont. 



Specimens from North mountain, near the Catskill Mountain 



House. N.Y. 



Betula popialifolia (American white birch) 



*44 A bright rusty erineum lining dimples on the under side of 



the leaf; dark brown or brick-red when dry. Trichomes capitate. 



Peck '69, p.ioi (Erineum aureum Pers.) N.Y. 



German '92, no. 16, fig. 4 N.H. 



Professor Peck's specimens from Fort Edward, as above, are 



in the State Herbarium, also others from Nassau (Peck) labeled 



E. betulinum Reb. ; see our no. 39. E . aureum was 



described from Populus nigra and P. fastigiata,( Per- 



soon '22: no. 23), and appears quite another thing.. 



Betula pumila (low birch) 



45 A transparently white, granular erineum on the surface of 

 the leaves. 



Jarvis '07, p. 63, fourth sp. Ont. 



Betula sp. 



46 Erineum semydophilum Link no. 11, "in foliis 

 betulinis Horti." 



Schweinitz '34, no. 2798 Pa. 



Placed under section Phyllerium with simple trichomes, which 

 distinguishes it from any of the preceding forms on birch. Appar- 

 ently not in Persoon. 

 5 



