Placynthium tremniacum (A. Massal.) Jatta

Little known species, closely related, maybe even conspecific, with the most common P. nigrum, from which it differs in a pruinose thallus, less developed prothallus and mostly 1-septate spores (Nimis et al. 2018). Czeika & Czeika (2007) synonymized the two species and noted that the type material of P. tremniacum contains both 3-septate and 1-septate spores. The identity of the Czech specimens (see literature) requires further studies.

Literature: Kőfaragó-Gyelnik V. (1940): Cyanophili: Lichinaceae, Heppiaceae, Pannariaceae. – Rabenhorst‘s Kryp­togamen Flora, Borntraeger, Leipzig, 9/2(2): 1−272. Vězda A. (1959): Doplňky k rozšíření lišejníků na Moravě I. – Sborník Klubu přírodovědeckého v Brně 31: 51–58. Vězda A. (1961): Třetí příspěvek k rozšíření lišejníků v Jeseníku. − Přírodovědný Časopis Slezský, Opava, 22: 447−458. Czeika H. & Czeika G. (2007): Placynthium in den Alpen und Karpaten sowie in benachbarten Gebieten. – Herzogia 20: 29–51. 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 Peltigerales Placynthiaceae Placynthium

Red List (Liška & Palice 2010):DD – data deficient
Red List (Malíček 2023):NE – not evaluated

Occurrence in the Czech Republic

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