CATALOGUE OF BRITISH PLANT-GALLS 157 



Fungi Dense masses of long twiggy outgrowths on the 



branches, often springing from a large woody core, 

 forming a "witch's broom." 



ExoASCUS TURGiDUS Sadebeck 200 

 Syn. Ascomyces turgidus Phil. 

 Massee, Brit. Fung. Flora, iv., pp. 17, 18. 



Betula tomentosa Reith. and Abel {pubescens Ehrh.). 

 72. White Birch. 

 Acari On the lower surface of the leaf, usually in the axils of 



the lateral veins, a depression lined with cylindrical con- 

 torted hairs. Slight swelling on upper surface. Phylle- 

 rium tortuosum Greville. 



Eriophyes honotus Nalepa 201 

 Greville, 1824, ii., pi. 94. Houard,- No. 1095. 



Alnus rotundifolia Mill, (gluiinosa Gaertn.). no. 

 Alder. 

 Lepidop- Slight swelling on a twig at the base of a petiole, some- 

 tora times causing flexure beyond the point of attack. The 

 internal cavity contains a single larva. 



Epiblema tetraquetrana Haworth 202 

 Syn. Phloeodes tetraquetrana Barrett. 

 Connold, Plant Galls, fig. 21. Houard, No. 1123. 



), Staminate catkins and young shoots deformed. 



Argyresthia Goedartella Linn. 203 

 Syn. Argyresthia literella Haworth. 

 Connold, Plant Galls, fig. 26. 



Acari On the lower surface of the leaf (very rarely on the 



upper) a mass of unicellular hairs, white at first, becoming 

 brownish. The hairs are much swollen and club-shaped 

 at the extremity. There is a slight swelling or blister on 

 the upper surface of the leaf Erineum alneum Persoon. 



Eriophyes brevitarsus Focken 204 

 It is doubtful whether Connold's illustrations (see Veg. 

 Galls, pi. 49, and Plant Galls, fig. 23) are of this gall. 

 Houard, No. 1133. 



,, Little subspherical red excrescences on the upper 



surface of the leaf, about the size of a hemp-seed, con- 

 stricted at the base. These pimples open on the inferior 

 "^ surface by a mouth situated on a slight swelling surrounded 



by a circular depression. The interior is lined with 

 cylindrical hairs that are not visible externally. Cepha- 

 loneon pustulatum Bremi. (Plate XXI. 2.) 



Eriophyes laevis Nalepa 205 

 Connold, Veg. Galls, PI. 54; Plant Galls, fig. 24. 

 Houard, No. 1128. 



