An inconspicuous crust with black perithecia, without any apparent marks of lichenization. The species is probably linked to birch bark. Similar microfungi occurring on birch bark are Arthopyrenia analepta, Leptorhaphis epidermidis and Mycomicrothelia wallrothii. However, Arthopyrenia fallaciosa may be securely identified based on unpigmented, few-celled, submuriform spores, thin pseudoparaphyses and brown perithecia wall (K+ green). Cyrtidula major, known for example from the British Islands and linked to birch bark as well, is a similar species with K- perithecia wall and paraphyses with rounded cells.
The species distribution in Europe is less known, it probably occurs mainly in northern Europe. In the Czech Republic, it has been reported only from the Křivoklát region: (birch in the protected area Týřov) and Ledové sluje in the Podyjí National Park.
Literature: Coppins B. J. & Earland-Bennett P. M. (2009): Cyrtidula Minks (1876). – In: Smith C. W., Aptroot A., Coppins B. J., Fletcher A., Gilbert O. L., James P.W. & Wolseley P. A. [eds], The Lichens of Great Britain and Ireland, p. 368–369, The British Lichen Society, London.taxonomic classification: most frequented synonyms:Julella fallaciosa
All records: 2, confirmed 2. One click on a selected square displays particular record(s), including their source(s).