A crustose species associated with humid calcareous rocks, primarily in mountain areas. In the Czech Republic, it is only known from a historical collection from the Krkonoše foothills. It was found on shaded calcareous boulders in abandoned quarries between Jánské Lázně and Vrchlabí (Kuťák 1952, Vězda 1967). It has not been confirmed there recently. The three oldest records in the catalogue of lichens from the 19th century (Vězda & Liška 1999) are questionable and probably refer to an unspecified collection by Josefina Káblíková from Krkonoše. According to the thallus description (Mann 1825), they probably represent a different lichen.
Sagiolechia protuberans might resemble some Acarospora or Sarcogyne species in its black umbonate (with central sterile button) apothecia and deeply split margin. However, it has a trentepohlioid photobiont, which gives its thallus distinguishing orange, pinkish or reddish colour. The colour, however, fades away in herbarium. Microscopically, it can be reliably identified based on halonate 3-septate ascospores (Vězda 1967).
Literature: Mann W. (1825): Lichenum in Bohemia observatorum dispositio succinctaque descriptio. – Pragae: Typis Sommerianis. Kuťák V. (1952): Lišejníky v Krkonoších. – Časopis Národního musea 121: 106–116. Vězda A. (1967): Flechtensystematische Studien VI. Die Gattung Sagiolechia Massal. – Folia Geobotanica et Phytotaxonomica Bohemoslavica 2: 383–396.taxonomic classification:
Ascomycota → Lecanoromycetes → Ostropales → Sagiolechiaceae → Sagiolechia
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