REPORT OF THE STATE ENTOMOLOGIST I907 I25 



Alnus alnobetula (mountain alder) 



22 E r i n e u m a 1 n i g- e n u m Link no. i8 " frequens in foliis 

 Alni undnlatae " (= viridis or alnobetula) 



Schweinitz '34, no. 2800 Pa. 



Placed under section Phyllerium, with simple trichomes. 



Alnus glutinosa ? (European alder) 



23 Eriophyes brevitarsus Fockeu, making an erineum 

 on species of Alnus, has been recorded from North America by 

 Nalepa, Das Tierreich, Lief. 4, page 8 (1898) ; see Banks '07. As 

 that paper is not accessible to me I am unaware whether it was 

 found on the introduced or a native alder, and am indebted to 

 Professor Banks for the reference. 



Connold 1901 [Brit. Veg. Galls, p. 130, pi. 49], describes the Euro- 

 pean gall, on A . glutinosa, as a blisterlike swelling on the 

 upper surface of the leaf often involving the veins and midrib, 

 smooth and glossy above, beneath slightly pubescent. He indicates 

 in the synonymy Erineum alneum Persoon and Phyl- 

 lerium a 1 n i g e n u m Kunze ; these appear from the descrip- 

 tions to be quite different from each other [see the preceding]. E. 

 alneum Persoon '22: no. 21 is described (from A. gluti- 

 nosa) as a Grumaria, thus having the trichomes capitate, which 

 distinguishes it from the following forms. 



Alnus incana (speckled alder) 

 *24 A white frostlike erineum on under side of leaf, in the 

 axils of the veins. Trichomes dense, pellucid. 



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



Specimens are in the State Herbarium from Fort Edward [^sce 

 Peck 1869, 22d Rep't, p.ioi, Erineum a 1 n i g e r u m] , Catskill 

 mountains and Albia (Professor Peck) labeled Erineum 

 a 1 n i g e r u m Kunze, " differ.'; from E . alneum Pers." and 

 " near E. tortuosa but hypophyllous and colored." These 

 specimens are orange to rusty brown (dried) and in some the gall 

 covers nearly the entire under surface. N.Y. 



Very probably identical with our no. 22, E . a 1 n i g e n u m . 

 For E. alneum see the preceding. The description of E. 

 t o r t u o s u m is not accessible to me ; very likely it is the fol- 

 low insf. 



