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Degelia cyanoloma (Schaer.) H. H. Blom & L. Lindblom comb. et stat. nov., a distinct species from western Europe

  • Hans H. BLOM (a1) and Louise LINDBLOM (a2)

Abstract

Degelia cyanoloma (Schaer.) H. H. Blom & L. Lindblom is resurrected from synonymy and elevated from varietal rank to species. The taxon was earlier referred to D. plumbea (Lightf.) P. M. Jørg. & P. James, however, several discontinuous character states distinguish the two species. Degelia cyanoloma is characterized morphologically by having a large thallus that is pale greyish when dry, lobes that are composed of consecutive trough-shaped segments with an upper surface without squamules, no isidia or soredia, and apothecia discs that are dark reddish brown to blackish. Degelia cyanoloma has a euoceanic distribution and is known from western Europe (Norway, France, Great Britain, Ireland, Portugal, Spain). Based on results from studies of morphology, we hypothesize that D. atlantica (Degel.) P. M. Jørg. & P. James is the closest relative of D. cyanoloma among the European species of the genus whereas D. plumbea is closely related to D. ligulata P. M. Jørg. & P. James.

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References

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James, P. W. & Purvis, O. W. (1992) Degelia Arvidsson & Galloway (1981). In The Lichen Flora of Great Britain and Ireland (Purvis, O. W., Coppins, B. J., Hawksworth, D. L., James, P. W. & Moore, D. M., eds): 230231. London: Natural History Museum Publications.
Jørgensen, P. M. (1978) The lichen family Pannariaceae in Europe. Opera Botanica 45: 1124.
Jørgensen, P. M. (1996) The oceanic element in the Scandinavian lichen flora revisited. Symbolae Botanicae Upsalienses 31: 297317.
Jørgensen, P. M. & James, P. W. (1990) Studies in the lichen family Pannariaceae IV: The genus Degelia. Bibliotheca Lichenologica 38: 253276.
Krog, H., Østhagen, H. & Tønsberg, T. (1994) Lavflora. Norske busk- og bladlav. 2 edition Oslo: Universitetsforlaget.
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Keywords

Degelia cyanoloma (Schaer.) H. H. Blom & L. Lindblom comb. et stat. nov., a distinct species from western Europe

  • Hans H. BLOM (a1) and Louise LINDBLOM (a2)

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