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This rare and much overlooked species occurs on rock and soil. The thallus is chalky white, thin to thick. The species is often sterile but is then told by the frequent presence of prominent, black, smoothly rounded spots or pycnidia (up to 0.4mm diam.). When fertile, the elongate discs (slit-like lirellae) can occur in untidy heaps. Under the microscope the spores have on average, three to five evenly-spaced divisions.
Original text submitted by Vince J. Giavarini
|Simms, M. J., (2016). Opegrapha areniseda Nyl.. [In] LichenIreland. |
http://www.habitas.org.uk/lichenireland/species.asp?item=19198 Accessed on 2016-06-24.