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Tricholoma terreum

 

An occasional find, Tricholoma terreum is a good edible mushroom but can be confused with other slightly poisonous grey Tricholoma species. Mainly confined to coniferous woods, although occasionally found under deciduous trees, this largish Tricholoma prefers calcareous soil. Rarely solitary, these mushrooms are usually found in quite large groups. The name Grey Knight-cap is sometimes given to this species.

Care is necessary when gathering these mushrooms for food, because Tricholoma pardinum, another greyish species, is slightly poisonous; however, its mealy smell helps distinguish it from the almost odourless Tricholoma terreum.

Cap

Silkily fibrous, the cap of this autumn fungus is at first conical but eventually almost flat with a slight umbo. mouse-grey or grey-brown fibres radiate from the centre of the cap, which at maturity measures between 3 and 10 cm in diameter.

The edge of the cap is noticeably paler than the centre.

Gills

White, turning grey and often tinged with yellow as the fruiting body ages, the gills are sinuate, broad and crowded.

Stipe

The stems are smooth, white and more or less even in diameter. There is no stem ring.

Spore print

White.

Odour/taste

Not distinctive.

Habitat

Mycorhizal with softwood trees, notably pines, on rich calcareous soils.

Season

August to October.

Occurrence

Infrequent.

Similar species

  1. Tricholoma pardinum is a larger mushroom with a mealy odour; it is slightly poisonous.

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