Abstract
<p>A two-year study was carried out on the ericaceous plant collection of the Botanic Garden of the Jagiellonian University in Cracow and the Rogów Arboretum of the Warsaw University of Life Sciences on the following plants: wild rosemary <em>Ledum palustre</em> L., leatherleaf <em>Chamaedaphne calyculata</em> (L.) Moench and American cranberry <em>Oxycoccus macrocarpus</em> (Ait.) Pursh. Diverse micromycetes species composition was specified on the leaves of tested ericaceous plants. The perpetrators of dying leaves were recognized, among which the dominant role was played by the necrotroph <em>Pestalotiopsis sydowiana</em>. Quantitative and qualitative comparative analyses of micromycetes in both locations were carried out, showing a comparable degree of plant colonization by these fungi in the botanic garden and arboretum. The study may be helpful in explaining the causes of dieback of protected and endangered plants in Polish flora.</p>
Highlights
The role of botanic gardens is to protect rare and endangered plant species, so one of the duties is the storage and reproduction of these species
Micromycetes communities inhabiting the leaves of wild rosemary, leatherleaf and American cranberry growing in the Cracow Botanic Garden and the Rogów Arboretum differed in species composition and number of isolated colonies
The leaves of wild rosemary from the botanic garden and arboretum were inhabited by fungi in a comparable rates
Summary
The role of botanic gardens is to protect rare and endangered plant species, so one of the duties is the storage and reproduction of these species. The following plants are threatened by extinction: wild rosemary Ledum palustre L. Rhododendron tomentosum Harmaja), leatherleaf Chamaedaphne calyculata (L.) Moench and American cranberry Oxycoccus macrocarpus (Ait.) Pursh. Wild rosemary grows on peat bogs and swamp forests. This is a medicinal plant, often obtained from natural habitats, in Poland is under partial protection. Leatherleaf is the only species in the genus Chamaedaphne. In Poland its natural habitat is the Kampinos National Park and Drawa National Park, where this species is under careful protection as a relic of glaciation. The American cranberry grows in natural habitats and wetlands in the eastern part of North America but in Poland is recognized as domesticated plant
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