Aspicilia indissimilis (H.Magn.) Räsänen

Nordin, Anders, 2015, New synonyms and lectotypes in Aspicilia (Megasporaceae, Ascomycota), Phytotaxa 192 (3), pp. 197-200 : 198

Aspicilia indissimilis (H.Magn.) Räsänen (in Huuskonen 1949: 19)

Basionym:— Lecanora indissimilis Magnusson (1939: 68) . Type:— NORWAY. Finnmark: Varanger, 22 July 1957, Th.M. Fries (holotype

UPS!). = Lecanora contraria Magnusson (1939: 80) . Type:— SWEDEN. Lycksele lappmark: Tärna par., Björkfors, Kvarnbäcken, 14 July 1924,

A. H. Magnusson 8221 (holotype UPS!). syn. nov. = Lecanora hultingii Magnusson (1939: 36) . Type:— SWEDEN. Dalsland: Forsbacka, 1870, J. Hulting (holotype GB!). syn. nov. = Lecanora stenholmii Magnusson (1939: 36) . Type:— SWEDEN. Jämtland: Åre par., Mörvikshummeln, in lower slope, 7 July 1936, C.

Stenholm (holotype UPS!). syn. nov.

Apart from the type there is only one additional collection referred to Lecanora contraria by Magnusson. It has the same collection number and is from the same area but the label reads “Björkfors, by a torrent” and it dates from 17 July. Both specimens have a thin, dark brown thallus, and the rim of the apothecia is darker and more prominent than usual. Otherwise it agrees well with more typical representatives of Aspicilia indissimilis , which has turned out to be very variable both in external morphology and colour when studied in the field.

Only the type collection is known of Lecanora hultingii . It has a whitish to pale dirty yellowish thallus, like several other Aspicilia indissimilis specimens growing in shaded situations at shores of lakes and rivers. This is probably also the habitat for this specimen, according to Magnusson (1939). This collection is one of very few of the species from S Sweden. It was originally labelled Lecanora gibbosa by Hulting.

Also Lecanora stenholmii is only known from the type collection. It contains two intermixed species, Aspicilia indissimilis and Sagedia zonata . Magnusson combined apothecia of the former with pycnidia of the latter and named this “hybrid species” after the collector. The main part is the former species, and there are also pycnidia with distinctly longer conidia (c. 16–21.5 μm long vs. 8–9 μm of L. stenholmii ) agreeing with those of A. indissimilis . Both species are still present at the type locality.