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Doebbeler, Peter (2019): Tremella bryonectriae sp. nov. - the first hyperbryophilous fungal species. In: Nova Hedwigia, Vol. 109, No. 3-4: pp. 369-378
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Abstract

The tiny, microscopic Tremella bryonectriae (Tremellales, Basidiomycota) is a newly discovered heterobasidiomycete with a presumed mycoparasitic lifestyle. The species is characterized by the absence of basidiomata, by having claviform probasidia, two-celled and longitudinally septate basidia with tubiform sterigmata, ellipsoidal basidiospores, and its occurrence on the mycelia and developing ascomata of Bryonectria cuneifera (Hypocreales). The inconspicuous host, B. cuneifera, grows between the leaf lamellae of the moss Polytrichum formosum. Tremella bryonectriae is documented by just a few records in Europe. It is the first hyperparasite recorded on a bryophilous ascomycete. The species expands both the host spectrum of tremelloid fungi and the complexity of the associations between Polytrichaceae and their many obligate fungal parasites.