Forest entomology . Fig. 29.—Galls on leaves of commonalder (Alnus glutinosa) causedby Eriophyes Fig. 30.—Galls on midrib of the leaves of commonalder (Alnus glutinosa) caused by Eriophyesaxillaris. light-green to dark-brown, and always found in pairs,they are hollow, and lined with hairs. Fig. 30. In section Eriophyes tetanothrix (Icevis) (Nal.) This gall is found on the leaves of Salix caprea. This species ofwillow is very common, and, as every botanist knows, very variableas regards the size and shape of the leaf. The galls of this speciesare generally found on the small-leaved var
Forest entomology . Fig. 29.—Galls on leaves of commonalder (Alnus glutinosa) causedby Eriophyes Fig. 30.—Galls on midrib of the leaves of commonalder (Alnus glutinosa) caused by Eriophyesaxillaris. light-green to dark-brown, and always found in pairs,they are hollow, and lined with hairs. Fig. 30. In section Eriophyes tetanothrix (Icevis) (Nal.) This gall is found on the leaves of Salix caprea. This species ofwillow is very common, and, as every botanist knows, very variableas regards the size and shape of the leaf. The galls of this speciesare generally found on the small-leaved variety, and on the upper 30 FOREST ENTOMOLOGY. surface of the leaf. A section of the gall, which is comparatively easily made, shows that the walls are very thick. There are many other species forming galls on leaves of our foresttrees and shrubs in many parts of the coun-try, as, for example, on the leaves of the Wayfaring tree ( Viburnum lantana), , which was photographed from a leaftaken in a Surrey lane. Species causing Malformation of Flowers,Fruit, or
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