Lecanora, in the traditional sense of Zahlbruckner, was an artificial assemblage of species, and several genera have been split off over the years, some of which do not belong to the Lecanoraceae. Among the segregated genera the following ones occur in Italy:
Bryonora Poelt: segregated from Lecanora mainly on the basis of the morphology of the apothecia. It consists of c. 15 species occurring on acid substrata (soil, plant debris, mosses), mostly above treeline, and has the highest diversity in the mountains of Central Asia. The molecular analysis by Svennsson & al. (2022) confirmed the position of the genus in the Lecanoraceae, while finding no support for treating Bryodina Hafellner as a genus separate from Bryonora.
Glaucomaria M. Choisy A rather well-defined genus including the former Lecanora rupicola-group, as defined by Grube & al. (2004), Blaha & Grube (2007) and Zhao & al. (2015a), characterized by strongly pruinose, often semi-immersed apothecia containing sordidone, the disc pruina reacting C+ yellow or orange. It appears to occupy a basal clade within the Lecanoraceae.
Lecanora Ach. - In its present circumscription, Lecanora remains one of the largest genera of lichenised ascomycetes, with c. 550 species traditionally characterised by hyaline, non-septate ascospores, Lecanora-type asci, the presence of a thalline apothecial margin (lecanorine apothecia), and predominantly crustose, more rarely lobate thalli containing green-algal photobionts.
Lecanora still remains a heterogeneous assemblage of different groups, several of which probably deserve generic rank, but comprehensive molecular work on the phylogeny of the Lecanoraceae is still in preliminary stages and hampered by the sheer size of the genus. Several groups have been recognised at various taxonomic levels, such as the L. polytropa- and L.varia-groups (Pérez-Ortega & al. 2010), the L. subfusca-group being the core of the genus (see e.g. Brodo 1984, Malíček 2014). Although the phylogenetic relationships among groups are still largely unresolved, recent molecular studies largely confirmed the notion that some are in itself heterogeneous. The phylogenetic relationships between the major clades of Lecanora are still largely unresolved, and require more intensive taxon and character sampling.
Polyozosia A. Massal.: a recently-resurrected genus including species which are most common on rocks and bark, that has been shown to form a clade separate from Lecanora s.str., which was at first segregated into Myriolecis, which proved to be a later synonym of Polyozosia (see Zhao & al. 2016, Kondratyuk & al. 2019). The species either contain chlorinated xanthones, often accompanied by depsidones, or lack secondary metabolites. The group is notoriously difficult, and identification requires the observation of fine morphological and chemical details (see e.g. Śliwa 2007, Śliwa & al. 2012). The genus has a worldwide distribution, but is most diverse in temperate to arctic-alpine regions of the Northern Hemisphere. The North American species were monographed by Śliwa (2007). A key to European coastal species with a C+ reaction was published by Bertrand & al. (2018). Useful information, especially on the coastal species, is provided by Bertrand & Roux (2011), and Bertrand & al. (2010).
Protoparmelia M. Choisy : a cosmopolitan genus with c. 25 species, differing from Lecanora in the grey- to reddish-brown thallus, the generally smaller, narrower ascospores, and the straight conidia. The structure of the exciple is similar to that found in the Parmeliaceae, and the genus has been included in that family by various authors, also on the base of recent molecular investigations (Arup & al. 2007, Crespo & al. 2007). The phylogenetic study by Singh & al. (2015) confirms that, in the present circumscription, the genus is heterogeneous: five previously described species and one species putatively new to science are close to Miriquidica. In contrast to members of Protoparmelia s.str., which produce lobaric or alectoronic acids, these taxa synthesize norstictic acid, and often parasitize other lichens. The taxonomic consequences will be drawn in a future revision of Miriquidica by E. Timdal & al., so that here these species are still placed into Protoparmelia s.lat. In Protoparmelia s.str. the analysis of Singh & al. (2015) suggest the presence of a tropical and an extra-tropical lineage, and eleven previously unrecognised distinct species-level lineages within P. badia s.lat. and P. montagnei s.lat.
Protoparmeliopsis M. Choisy: this genus, which was resurrected to accommodate the Lecanora muralis-group, although heterogeneous in the present circumscription, could be largely retained on the basis of molecular data (Kondratyuk & al. 2014).
Rhizoplaca Zopf: this genus of c. 19 species, in the traditional circumscription, was characterised by an umbilicate thallus with an upper and a lower cortex, as well as a cupulate hypothecium. The genus occurs in the Northern Hemisphere, South America, and Antarctica, but is absent from Australasia. It has the centre of distribution in western North America. Within the past decade, a number of studies have indicated that traditional phenotype-based species circumscriptions fail to recognize multiple species-level lineages within this genus, e.g. in the analysis by Arup & Grube (2000), most species form a well-supported clade, but Rh. peltata proved to be more closely related to Protoparmeliopsis. Furthermore, molecular data suggest that many cryptic species may be present, such as in the Rh. melanophthalma-group (Leavitt & al. 2013, 2016). In a recent study by Zhao & al. (2016) Rhizoplaca was emended to include three placodioid taxa previously classified in Lecanora, whereas R. aspidophora and R. peltata were excluded from Rhizoplaca, the latter having been transferred into Tephromela.
Tephromela M. Choisy - a cosmopolitan genus of c. 30 species found in temperate to tropical regions on bark, wood, rock or on other lichens. Its familial placement was for a long time unclear: preliminary molecular data (Miadikowska & al. 2006, Arup & al. 2007) indicated that it does belong neither in the Lecanoraceae nor in the Ramalinaceae, but is related to Mycoblastus, being currently placed in the Tephromelataceae (see also Miadikowska & al. 2014). The T. atra-complex was studied by Muggia & al. (2008).
The present key, with 207 infrageneric taxa, includes all species reported from Italy (Nimis 2016), plus several species known from adjacent territories (see e.g. Nimis & al. 2018, Roux & al. 2022).

References

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Last modified: October, 25, 2024

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