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On (soft) limestone pebble immersed in calcareous soil and bryophytes in an old limestone quarry.
Forming a thin, minutely cracked grey green thallus with black epruinose apothecia not immersed into the substrate.
Hymenium ~80-82 µm tick. Epihymenium pigmented. Subhymenium faint ochre to unpigmented.
High resolution composite image available here:
249A-Sarcogyne nivea.jpgHemiamyloid reaction to IKI/Lugol blue to red
The pictures show Lugols solution diffusing in from the right side with a gradual colour change from light blue to reddish-brown.
K-I blue hymenium
(Lugol after treatment with ~10 KOH)
Many spored asci (>100)
Spores (2,9)3,1-4,9 x 1,8-2,5 µm
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