Until recently, the species was known only from a type locality in Denmark. It is similar to C. ulcerosa, but differs in specific soralia, that are in its early stages covered with greyish-white cucullate membranes. Lately, it turns out that C. alstrupii is relatively abundant in the British Isles, for example, and is appearing in the lists of lichens in other European countries. In the Czech Republic, it has so far been found only once near Modrava in the Šumava Mountains.
Literature: Palice Z., Malíček J., Peksa O. & Vondrák J. (2018): New remarkable records and range extensions in the central European lichen biota. – Herzogia 31: 518–534.taxonomic classification:
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