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Inocybe geophylla

 
Inocybe geophylla is a very common species and is sometimes mistaken for small field mushrooms (Agaricus campestris) with disastrous results: it is very poisonous and its consumption can be fatal.

Identification guide

Cap

There are two common varieties of this  species: the Common White Inocybe, Inocybe geophylla, and a variety sometimes referred to as the Lilac Inocybe, Inocybe geophylla var. lilacina.

The smooth, silky cap has a diameter of 1.5 to 3.5 cm; initially conical, it flattens as it  matures, usually retaining a pointed umbo and streaky radial fibres that in dry weather tend to tear into strips towards the edge of the cap. Both the white and lilac varieties fade to ochre-brown from the centre as the fruit body ages.

Gills

The crowded gills, which are notched or adnexed, start off creamy-grey and later turn clay-brown as the spores mature.

Stipe

3 to 6 mm in diameter and up to 6 cm tall, the stipe is smooth and silky, sometimes slightly fibrillose towards the base, and the same colour as the cap. The stipe also gradually turns clay-brown with age.

Spore print

Dull brown.

Odour/taste

Slightly earthy or mealy smell. Reported to have a mild taste (but please be aware that this is a deadly poisonous fungus and so tasting any part of it is not advisable).

Habitat

Beside paths and on roadside verges beneath deciduous trees and in mixed woodland; less frequently under conifers.

Season

Summer and autumn.

Occurrence

Very common. 

Similar species

  1. The white variety, Inocybe geophylla, could be confused with Agaricus campestris, which is usually larger, has a stem ring and does not have a silky cap.
  2. Amethyst Deceiver, Laccaria amethystea has violet gills but is otherwise very similar in appearance to Inocybe geophylla var. lilacina.
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