An inconspicuous crust with no apparent marks of lichenization, forming small stromata with one to six perithecia. It may resemble juvenile tiny thalli of Arthonia ruana, but differs in the type of ascomata and spores. It occurs on twigs and smooth bark of oaks and hazels (Coppins & Earland-Bennett 2009). In the Czech Republic, it has so far been collected only in several localities at middle and submontane elevations. Most of the specimens collected in the country have well-developed stromata with perithecia, but spores have been noticed rarely.
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:
All records: 6, confirmed 6. One click on a selected square displays particular record(s), including their source(s).