Living in each other’s pockets: insights into the life cycle of Tremella caloplacae s. l.

Le résumé fourni par la source

Complex life-cycles are common among fungi. Dimorphism in basidiomycetes involves alternation between a unicellular yeast phase and a filamentous phase, frequently forming basidiomata. Here we have studied the dimorphic life cycle of the lichen-inhabiting basidiomycetes in the Tremella caloplacae species complex, with particular focus on the newly distinguished Tremella parietinae . Using FISH-CLSM, PCR and Sanger sequencing, we have investigated the presence and distribution of the different life-cycle phases of T. parietinae within the lichen Xanthoria parietina , and also conducted an exploratory investigation into the presence of a Tremella yeast phase in other lichens of the Teloschistaceae . We could show that the filamentous phase of T. parietinae is restricted to the hymenium of X. parietina , whereas the yeast phase also grows elsewhere in the thallus. Tremella caloplacae s. str. is detected by PCR in Calogaya , Flavoplaca and Gyalolechia lichens, whereas its basidiomata are restricted to Variospora lichens. These findings suggests different lichen-specificity of T. caloplacae in the different phases of its life-cycle.

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