Toninia squalida is characterized by a brown squamulose thallus, black lecideine apothecia and long three- to seven-septate spores. It typically grows on soil and in rock crevices, often on bryophytes or cyanolichens, especially when young. It is known from both basic and acidic substrates. The lichen is widely distributed, with almost a Holarctic distribution, known from the equator to the Arctic (Timdal 1992). In central Europe, it mostly occurs at higher elevations, mainly in the continental areas of the Alps (Nimis et al. 2018). It the Czech Republic, the species is considered extinct although its historical occurrence here is uncertain. Only records from the 19th century are known (see the Vězda & Liška 1999 catalogue). Those with specified localities refer to the oldest record from the Velký Kotel glacial cirque in the Krkonoše Mts (Mann 1825) which requires revision.
Literature: Mann W. (1825): Lichenum in Bohemia observatorum dispositio succinctaque descriptio. – Pragae: Typis Sommerianis. Timdal E. (1992): A monograph of the genus Toninia (Lecideaceae, Ascomycetes). – Opera Botanica 110: 1–137. Nimis P. L., Hafellner J., Roux C., Clerc P., Mayrhofer H., Martellos S. & Bilovitz P. O. (2018): The lichens of the Alps – an annotated checklist. – Mycokeys 31: 1–634.taxonomic classification:
Ascomycota → Lecanoromycetes → Lecanorales → Ramalinaceae → Toninia
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