Clavariadelphus ligula, commonly known as the strap coral, is an inedible species of fungi in the Gomphaceae family.

Russula illota is an inedible species of mushroom in the genus Russula.

Panus conchatus is an inedible species of mushroom that occurs throughout the northern hemisphere.

It is regarded as edible by some authorities, although others call it suspect and it resembles inedible species.

The most notable inedible species is the yellow-staining mushroom, A. xanthodermus.

But biodiversity losses of small inedible species often provoke the response, "Who cares?

- While it is true that some otherwise inedible species can be rendered safe by special preparation, many toxic species cannot be made toxin-free.

Xylaria hypoxylon is an inedible species of fungus in the genus Xylaria.

Another inedible species, R. fragilis, has notched gills, and its stem stains blue with naphthol.

By honest error, harvests may include toxic or inedible species.