| Abstrakt: |
Molecular phylogenetic analysis of the mitochondrial small subunit and nuclear large subunit ribosomal DNA revealed that the lichen genus Graphissensu Staiger represents two separate lineages. Graphiss.str. comprises the species of the G. scriptaand G. subserpentinagroups (‘Eugraphis’), as well as the G. striatulagroup sensu Lücking. For the segregate genus, the name AllographaChevall. is available, and this genus includes the G. acharii, G. dussii, G. marginata, G. nuda, and G. symplectagroups. The separation of both lineages is supported by principal component analysis species ordination based on phenotype characters, although the G. dussiiand G. subserpentinagroups appear phenotypically intermediate. Species formerly placed in Hemitheciumsubg. Hemitheciumsensu Staiger were shown to belong to at least four lineages, one nested within Graphis(H. implicatum), one within Allographa(H. chlorocarpum), one sister to Allographa(H. rufopallidum), and one nested within the Phaeographisclade (H. plicosum). Allographa is genetically close to the bulk of lirellate Graphidaceae (Diorygma, Glyphis, Pallidogramme, Phaeographis, Platygramme, Platythecium, Sarcographa, Thalloloma, Thecaria), whereas Graphiss.str. exhibits unique genetic apomorphies and takes a more isolated position. |
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