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Mycological Progress

, Volume 2, Issue 2, pp 127–136 | Cite as

Caloplaca erodens [sect. Pyrenodesmia], a new lichen species from Italy with an unusual thallus type

  • Mauro Tretiach
  • Daniela Pinna
  • Martin Grube
Article

Abstract

Caloplaca erodens is a new species of sect. Pyrenodesmia, characterised by an orbicular, sorediate, bluish-grey thallus which is endolithic but emerges at the periphery with a white, K−, obscurely lobate prothallus. The species is frequent on calcareous outcrops and walls of isolated churches and ruins of the Central Apennines (Sibillini, Gran Sasso), where it may occur in large monospecific populations, from 1000 to 2500 m asl., and is also known from dry sites of the southern Alps. It has been found with apothecia only in the type locality, being predominantly sterile. The reproduction of this lichen is evidently linked to the release of fragments of clusters of photobiont cells and mycobiont hyphae which are continuously exposed with the dissolution of the substratum. Readily distinguished from the apparently similar endolithic C. alociza (which is characterised by numerous apothecia, black, K+ purple prothallus, and esorediate thallus), C. erodens probably belongs to the C. circumalbata complex, whose taxa are always epilithic but have a white, K− prothallus. The phylogenetic position of the new species within sect. Pyrenodesmia as inferred by ITS sequences of the nuclear ribosomal DNA is shortly discussed.

Keywords

Calcareous Type Locality Phylogenetic Position Lichen Species Photobiont Cell 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© DGfM 2003

Authors and Affiliations

  1. 1.Dipartimento di BiologiaUniversità di TriesteTriesteItaly
  2. 2.Soprintendenza per il Patrimonio Storico-ArtisticoBolognaItaly
  3. 3.Institut für BotanikKarl-Franzens-Universität GrazGrazAustria

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