The fruit body is a mushroom. The smooth, convex cap is up to 2 centimetres in diameter, blue (with a darker centre), partly translucent and striate. The gills are whitish. The stem (up to 2 centimetres long and a few millimetres in diameter) is also whitish and smooth has a blue, basal disk.
There is neither a partial nor a universal veil.
Spore print: white.
It grows on dead wood in wet forests, often in large groups.
Blue is a rare colour in fungi and Mycena interrupta should not be confused with any other species. There are some blue-capped species of Entoloma, that produce mushrooms of similar size, but they appear on soil and the caps are opaque.
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Mycena interrupta has been recorded at: