LICHALP

Thelidium rehmii Zschacke

Lichenised.

Substrate: siliceous rocks,

Altitudinal range: from the submediterranean/colline belt (potential vegetation: mixed deciduous forests dominated by Quercus and Carpinus) to the montane belt (potential vegetation: deciduous forests dominated by Fagus sylvatica and closed coniferous forests with Picea abies)

Note: a species with a thin, greenish thallus, black, hemispherically protruding perithecia (to c. 0.3 mm in diam.) lacking an involucrellum, and 1-septate, ellipsoid ascospores (to c. 30 µm long); on sandstone and siliceous schists in humid situations, at low elevations; rare throughout Central Europe; from the Alps there are only a few scattered records.