Calvitimela

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Calvitimela
Calvitimela armeniaca.jpg
C. armeniaca
Scientific classification e
Kingdom: Fungi
Division: Ascomycota
Class: Lecanoromycetes
Order: Lecanorales
Family: Tephromelataceae
Genus: Calvitimela
Hafellner (2001)
Type species

(DC.) Hafellner (2001)

Calvitimela is a lichen genus in the family Tephromelataceae (Lecanorales, Lecanoromycetes).[1] Members of the family Tephromelataceae are crustose lichens with green photobionts and lecideine or lecanorine apothecia. The species in Calvitimela have lecideine apothecia, are saxicolous and are primarily found in alpine to arctic regions.

Species[]

Calvitimela aglaea

Calvitimela currently includes ten species:

  • (Sommerf.) Hafellner
  • (DC.) Hafellner (type species)
  • Fryday
  • Haugan & Timdal
  • Haugan & Timdal
  • (Sommerf.) R. Sant
  • (Haugan & Timdal) R. Sant
  • (Hertel & Rambold) McCune
  • (Haugan & Timdal) M.P. Andreev
  • Calvitimela uniseptata G. Thor

Taxonomy[]

The taxonomic history of Calvitimela is long and relatively complex.[2] In the early days, the species now belonging to Calvitimela were placed in the classical genus Lecidea Ach., e.g. by Fries (1874; as Lecidea strips L. armeniacae).[3] and Magnusson (1931; as “Lecidea armeniaca- und elata-Gruppe”)[4] In the 1980s, several taxonomists revised large groups of lichens in Lecanora and Lecidea.[5][6] First, the generic name Tephromela was resurrected, and the new monotypic family Tephromelataceae described.[5] Then, a group from Lecidea was moved into the genus Tephromela M. Choisy.[6] This led to species with both lecanorine and lecideine apothecia being present in the same genus.[6] Finally, the genus Calvitimela was erected for species with lecideine apothecia previously placed in Tephromela.[5] Tephromelataceae consists of the Tephromela, Calvitimela, Mycoblastus Norman and Violella T. Sprib, and together these four genera constitute a well-supported monophyletic group.[7][8]

Morphology, anatomy, and chemistry[]

The species of Calvitimela are crustose lichens. Their thallus are areolate and their apothecia lecideine. The apothecia are convex, black and shiny.[9] Apothecia are rare or entirely absent in some sorediate species e.g. C. cuprea, C. livida [8] and C. talayana.[9]

Ascii are generally of the Lecanora-type,[5][10] but Bacidia-type ascii are also observed in C. aglaea and C. perlata.[8] The spores are usually simple and ellipsoid.[9] There is much chemical variation of secondary metabolites in the species of Calvitimela. Most prominently observed in the C. melaleuca – complex, with , norstictic, and acids occurring in different combinations in the species´ several chemotypes.[8]

Ecology and distribution[]

All species of Calvitimela grow on rocks. The species in Calvitimela reside either on boulders of varying size or directly on mountainous walls and are occasionally found on pebbles. A peculiar ecological preference is observed in C. cuprea. This species is more or less morphologically identical to C. livida, but seem to only grow on copper rich rocks, and is associated with old copper mine localities.[8]

Species in Calvitimela are predominantly distributed in alpine to arctic regions, and they seem to have a circumpolar distribution.[9] On the other hand, due to lack of sampling in certain regions of the world (e.g. Africa, Asia and South America), the true distribution of Calvitimela is only partly known. C. austrochilensis is described from Chile [10] and C. uniseptata from Antarctica,[11] respectively. These species have not yet been included in any molecular phylogenetic studies. Therefore, whether they belong in Calvitimela or not, is yet to be confirmed by molecular data.

Phylogeny[]

Molecular phylogenetics has revolutionized the taxonomy of crustose lichens and revealed an extensive amount of cryptic species diversity.[12] In Calvitimela there are some species that are morphologically identical, but are genetically distinct and have different chemotypes.[8] In the C. melaleuca–complex at least two distinct chemical lineages are observed [8] with no currently known morphological correlation. There have been few studies investigating Calvitimela from a molecular phylogenetics perspective.[7][8] Only one phylogeny focusing exclusively on Calvitimela has been published.[8] They found Calvitimela, Tephromela and Violella to constitute a well-supported monophyletic group. The relationship between the main clades remained partly unresolved, however. No study has yet included all species currently circumscribed to Calvitimela, but the genus is so far indicated to be paraphyletic.[7][8]

References[]

  1. ^ Hafellner, Josef; Türk, Roman (2001). "Die Lichenisierten Pilze Österreichs: Eine Checkliste der Bisher Nachgewiesenen Arten mit Verbreitungsangaben". Stapfia. 76: 3–167.
  2. ^ "Calvitimela". Retrieved 29 March 2020.
  3. ^ Fries, T, M. (1874). Lichenographia Scandinavica 1, 2. Uppsala.
  4. ^ Magnusson, A, H. (1931). "Studien Über Einige Arten der Lecidea Armeniaca- und Elata-Gruppe". Acta Horti Gothoburg. 6: 93–144.
  5. ^ a b c d Hafellner, Josef (1984). "Studien in Richtung Einer Natürlicheren Gliederung der Sammelfamilien Lecanoraceae und Lecideaceae". Beihefte zur Nova Hedwigia: 241–371.
  6. ^ a b c Hertel, Hannes; Rambold, Gerhard (1985). "Lecida Sect. Armeniacae: Lecideoide Arten der Flechtengattungen Lecanora und Tephromela (Lecanorales)". Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie.
  7. ^ a b c Spribille, Toby; Goffinet, Bernard; Barbara, Klug; Muggia, Lucia; Obermayer, Walter; Mayrhofer, Helmut (2011). "Molecular Support for the Recognition of the Mycoblastus Fucatus Group as the New Genus Violella (Tephromelataceae, Lecanorales)". The Lichenologist. 43 (5): 445–466. doi:10.1017/S0024282911000478. PMC 3428935. PMID 22936837.
  8. ^ a b c d e f g h i j Bendiksby, Mika; Haugan, Reidar; Spribille, Toby; Timdal, Einar (2015). "Molecular Phylogenetics and Taxonomy of the Calvitimela Aglaea Complex (Tephromelataceae, Lecanorales)". Mycologia. 107 (6): 1172–1183. doi:10.3852/14-062. PMID 26354804. S2CID 38702029.
  9. ^ a b c d Haugan, R; Timdal, E (1994). "Tephromela Perlata and T. Talayana, with Notes on the T. Aglaea-Complex". Graphis Scripta. 6: 17–26.
  10. ^ a b Fryday, Alan (2011). "New Species and Combinations in Calvitimela and Tephromela from the Southern Subpolar Region". The Lichenologist. 43 (3): 225–239. doi:10.1017/S0024282911000065. S2CID 84800278.
  11. ^ Thor, G (2011). "Calvitimela uniseptata G. Thor sp. nov". Phytotaxa. 18: 36.
  12. ^ Crespo, Ana; Lumbsch, H Thorsten (2010). "Cryptic Species in Lichen-Forming Fungi". IMA Fungus. 1 (2): 167–170. doi:10.5598/imafungus.2010.01.02.09. PMC 3348775. PMID 22679576.
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