Panaeolus foenisecii, commonly known as the Brown Mottlegill mushroom, is a small brown agaric which is widespread and characterized by being strongly hygrophanous. When moist, it typically appears darker, while it tends to become lighter in colour when dry. The mushroom is commonly found growing in grassy areas, such as lawns, meadows, and pastures, particularly those enriched with manure or decaying organic matter.

Cap starts as a bell or cone shape, but later expands to a broad convex form. It is hygrophanous, appearing medium to dark brown when wet and drying from the centre outward to a creamy-beige colour. The flesh is buff brown and thin and unchanging when sliced. Gills at first pallid brown, becoming mottled darker and finally chocolate-brown, narrowly attached to the stem and crowded. Stem lighter in colour compared to the cap, with a cream hue that appears flushed with mid-brown towards the base. It has a cylindrical shape and a fine fibrillose texture. There is no ring present on the stem. The basal mycelium is white. Spore print dark brown.

Microscopic Features: The spores are lemon-shaped and have a roughened surface. They have a size range of 11-18 x 6-9µm and feature a germ pore.

Synonyms: Panaeolina foenesecii is a synonym.

Panaeolina foenisecii on the www.first-nature.com web site.
Panaeolus foenisecii on the MushroomExpert.Com web site.