On the identity of some taxa of Pertusaria (lichens) described by C. F. E. Erichsen Author Oset, Magdalena text Phytotaxa 2021 2021-04-20 497 2 165 171 http://dx.doi.org/10.11646/phytotaxa.497.2.9 journal article 4450 10.11646/phytotaxa.497.2.9 833b0f76-aa56-46c0-a9ba-3652e981cb68 1179-3163 5423923 Pertusaria inopinata Erichsen (1936: 99) Type :—[ GERMANY , Schleswig-Holstein ] Bramsted , erratische Blöcke bei Bimöhlen , auf einer Weide , 27.05.1915 , leg. Erichsen ( lectotype HBG —designated here, Mycobank MB 10000452 ). Figure 1 . FIGURE 1. Lectotype of Pertusaria inopinata in HBG. The type specimen of Pertusaria inopinata is characterized by a hardly rimose, dark grey to olive-greenish, not areolated thallus, with numerous irregular, rounded, 0.2–0.3 mm wide, grey-whitish to olive-greenish soralia ( Figure 1 ). According to Erichsen (1936) the thallus reacts P+ yellow, K+ yellow, C–and I–. Norstictic acid and traces of lecanoric and gyrophoric acids were detected by own chemical analyses. This name was reported from Denmark ( Søchting & Alstrup 2002 ), Germany ( Erichsen 1936 ) and Poland ( Alstrup & Olech 1992 ). FIGURE 2. Lectotype of Pertusaria jurana in HBG. The type of Pertusaria inopinata is morphologically and chemically concordant with Lepra excludens ( Nylander 1885: 296 ) Hafellner , in Hafellner & Türk (2016: 172) (syn. Pertusaria excludens Nyl. ). Therefore P. inopinata should be considered as a synonym of L . excludens . During herbarium studies three original specimen of P. inopinata were found in HBG , one collected by Erichsen and annotated as ‘Typus’ consists of two pieces of stone with the same thallus ( Figure 1 ). The other two were cited in the protologue, but collected by Lettau and Schade. All samples studied correspond in morphological and anatomical characters with the description provided by Erichsen (1936) . The chemistry of the type specimen annotated as ‘typus’ and other samples were checked by P. James and norstictic acid and traces of lecanoric and gyrophoric acid were detected ( Hanko 1983 ). The presence of these secondary metabolites is confirmed by own research. Hanko (1983) cited as a ‘typus’ the specimen collected by Schade (“ DDR . Sachsen : Leusitzer Niederung 7.1936, Schade, HBG-1213”), but the data presented by Hanko (1983: 201) do not match those given in the protologue by Erichsen (1936: 99) , therefore, his typification cannot be considered effective, and consequently, a new lectotype of P . inopinata is designated ( Turland et al. 2018 ). Syntypes of P.inopinata examined. [ Germany ] Thüringen : Manebach im Thüringer Wald , auf Porphyrsteinchen eines begrasten Waldweges , 750 m , leg. G. Lettau ( HBG ) . [ Sachsen ] Krs. Bischofswerder, Oberputzkau , 325 m , 29.12.1936 , leg. G. Schade ( HBG ) .