Acari 
Fungi 
> 5 
Homop 
tera 
Acari 
Fungi 
9 
CATALOGUE OF BRITISH PLANT-GALLS 197 
Pustules about 4 by 2 mm. on the upper surface of the 
leaf, green, reddish, or brown, often numerous and 
coalescent, opening by a minute hairy aperture on the 
inferior surface. (Plate XXI. 1.) 
Eriophyes similis Nalepa 460 
Syn. Phytoptus similis Nal. 
Connold, Veg. Galls, pi. 65 ; Plant Galls, fig. 68. 
Houard, No. 3294. 
Densely fasciculated twigs on the branches, forming a 
“ witch’s broom.” 
Exoascus deformans Fiickel 461 
Syn. Ascomyces deformans Berk. 
Massee, Brit. Fung. Flora, iv., p. 15. 
Fruit much swollen and deformed, often curved and 
flattened, about three times the normal size, without stone 
or kernel. The whitish bloom, which appears in July on 
these malformed fruits, is the fruit of the fungus, and 
consists of closely packed asci. 
Exoascus pruni Fiickel 462 
Syn. Ascomyces pruni B. and Br. 
Massee, Brit. Fung. Flora, iv., p. 14. 
Prunus insititia Linn. 67. Bullace. 
Leaf margins swollen. See No. 457. 
Hyalopterus pruni Fabr. 463 
Buckton, ii., 111. 
Pustules on the leaves. See No. 460. 
Eriophyes similis Nalepa 464 
Houard, No. 3265. 
Densely fasciated twigs. See No. 461. 
Exoascus deformans Fiickel 465 
Fruit deformed. See No. 462 and Plate XXV. 
Exoascus pruni Fckl. 466 
Connold, Veg. Galls, pis. 126, 129; Plant Galls, fig. 79. 
Branches swollen, bark destroyed, the margin of the 
wound surrounded by a thickened irregular mass of living 
bark, presenting the condition known as “ canker.” 
467 
Massee, Textbook of Plant Diseases, p. 127. 
At one time said to have been caused by the fungus 
Nectria ditissima , which, however, has been shown to be 
only a saprophyte. Probably results from the presence 
of aphides. 
