Phylogenetic relationships among the hypothetical species pairsLobaria kurokawae/L. retigeraandL. pseudopulmonaria/L. isidiosawere investigated based on TLC techniques and the phylogenetic analysis of the internal transcribed spacers (ITS) nrDNA. Results of TLC demonstrate thatL. retigeraandL. kurokawaecan be chemically distinguished fromL. isidiosaandL. pseudopulmonariaby the absence of retigeranic acid. Parsimony analysis of 18 specimens shows two monophyletic clades – aL.retigeralineage and aL. isidiosalineage—both including their apotheciate counterparts. Unlike the original hypothesis of species pairs, our study reveals transitions from isidiate morphs that have the potential to rarely form apothecia, towards apotheciate morphs that produce no vegetative propagules.
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Cornejo et al. (2009) studied this question.
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