KEYS TO THE LICHENS OF ITALY - 10) MYRIOLECIS
Pier Luigi Nims
Apparatus of images: Andrea Moro - Software and databases: Stefano Martellos

This recently resurrected genus of the Lecanoraceae includes species most common on rocks and bark, which were mostly placed in the Lecanora dispersa-group, that has been shown to form a clade separate from Lecanora s.str. (see Zhao & al. 2016). While most species have a crustose and often inconspicuous thallus, a few taxa form placodioid to umbilicate thalli. 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 & al. (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). This key includes the 25 species which are known to occur in Italy (see Nimis 2016).

References

Bertrand M., Roux C. 2011. Lecanora oyensis sp. nov., une nouvelle espèce de lichen maritime. Bull. Ass. Franç. Lichénol., 36, 2: 107-117.
Bertrand M., Roux C., Barbero M. 2010. Lecanora bandolensis B. de Lesd., une espèce peu connue. Bull. Ass. Fr. Lichénol., 35, 1: 1-16.
Bertrand M., Monnat J.-Y., Lohézic-Le Dévéhat F. 2018. Myriolecis massei, a new species of Lecanoraceae from the coasts of the Armorican Massif in Western Europe. The Bryologist, 121, 3: 253-263.
Nimis P.L. 2016. The lichens of Italy. A second annotated catalogue. EUT, Trieste, 740 pp.
Śliwa L., 2007. A revision of the Lecanora dispersa complex in North America. Polish Botanical Journal 52(1): 1-70.
Śliwa L., Miadlikowska J., Redelings B.D., Molnar K., Lutzoni F. 2012. Are widespread morphospecies from the Lecanora dispersa group (lichen-forming Ascomycota) monophyletic? The Bryologist, 115, 2: 265-277.
Zhao X., Leavitt S.D., Zhao Z.T., Zhang L.L., Arup U., Grube M., Pérez-Ortega S., Printzen Ch., Śliwa L., Kraichak E., Divakar, P. K., Crespo A., Lumbsch H.T. 2016. Towards a revised generic classification of lecanoroid lichens (Lecanoraceae, Ascomycota) based on molecular, morphological and chemical evidence. Fungal Divers., 78: 293-304.


Project Dryades, Department of Life Sciences, University of Trieste - CC BY-SA 4.0