Hymenelia rhodopis (Sommerf.) Lutzoni  
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Family: Hymeneliaceae
[Aspicilia rhodopis (Sommerf.) Th. Fr., moreIonaspis epulotica var. rhodopis (Sommerf.) H. Magn., Ionaspis rhodopis (Sommerf.) Blomb. & Forssell, Ionaspis rhodopis subsp. melanopis (Sommerf.) Zahlbr., Ionaspis rhodopis subsp. rhodopis (Sommerf.) Blomb. & Forssell, Lecanora acharii var. rhodopis Sommerf., Lecanora rhodopis (Sommerf.) Nyl., Parmelia rhodopis (Sommerf.) Fr., Urceolaria rhodopis (Sommerf.) Sommerf.]
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  • The Lichen Flora of Great Britain and Ir
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Smith, CW et al., eds. 1994. The Lichen Flora of Great Britain and Ireland.

Thallus epilithic, of concave areoles, finely cracked, pale white-grey, soft and scabrid, pruinose; prothallus black, delimiting; photobiont Trentepohlia.  Apothecia white to pale pink, in low mounds like perithecia, 0.4-0.6 mm diam., thalline margin pale grey, disc pink, poriform, not deeply sunken, slightly concave, not separated from the thallus by a crack; hymenium 110-144 µm high; epihymenium K-, N-.  Ascospores 14-17 X 8-12 µm.

On limestone rock, montaine; rare.  Scotland (Braemar). Europe, N. America.

It resembles a Pertusaria on limestone.  Closely resembles H. epulotica which is +/- endolithic, with usually smaller apothecia.

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This project made possible by National Science Foundation Awards: #1115116