Hygrophanous

The adjective hygrophanous refers to the color change of mushroom tissue (especially the pileus surface) as it loses or absorbs water, which causes the pileipellis to become more transparent when wet and opaque when dry. Grouping of Psathyrella gracilis, some displaying hygrophanous pilei.Photo of the hygrophanous pileus of Panaeolina foenisecii The adjective hygrophanous refers to the color change of mushroom tissue (especially the pileus surface) as it loses or absorbs water, which causes the pileipellis to become more transparent when wet and opaque when dry.