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This lichen grows exclusively on the thallus of Phaeographis dendritica and can be recognised by the small, singly-scattered or clustered, minute slit-like discs with one-septate spores in the range 10–14 x 5–7µm. M. lentiginosa has no visible thallus of its own. In Ireland, the species is known from Counties Fermanagh and Galway and also south-east.
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