Mineral deposited between mushroom's cap and base of toadstool or some other fungus (5)

I believe the answer is:

morel

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'fungus' is the definition.
(morel is a kind of fungus)

I don't understand how the remainder of the clue works.

(Other definitions for morel that I've seen before include "Type of mushroom" , "Edible fungus" , "One has a cap" , "Edible mushroom" .)

I've seen this clue in the Sydney Morning Herald.

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