perforate mine

An interparenchymatous mine, from where repeatedly pieces have been eaten out of the “roof”, i.e. the palissade parenchyma. At first sight this type of more looks like a piece of leaf diseased by some fungus. When held against the light such a mine has a perforated appearance.

Phytomyza heracleana: mine

Phytomyza heracleana: example of a perforate mine.