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Dasineura urticae : ウィキペディア英語版 | Dasineura urticae
The nettle pouch gall develops in leaf veins, leaf petioles, flower stalks and sometimes the stem of ''Urtica dioica'' and ''Urtica urens''. This structure is caused by the gall midge or gnat ''Dasineura urticae'',〔 also spelled ''Dasyneura urticae''.〔Stubbs, Page 72〕 Synonyms are ''Perrisia urticae'' and ''Cecidomyia urticae''.〔Darlington, Page 141〕 ==The physical appearance of the galls==
The galls are irregularly shaped, smooth, often shiny, and coloured from purplish to pale green, exhibiting thickened walls, with a narrow slit-shaped opening, normally on the underside.〔Redfern, Page 467〕 The size is from 3-8mm. A number of galls are often found next to each other on the same or different plant structures, and they may coalesce.〔〔 The galls are mainly found around the growing apex and exhibit a wide range of forms, dependent on the organ in which they are situated.〔
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