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PL
Przedstawiono nowe stanowiska dwóch zagrożonych gatunków grzybów wielkoowocnikowych należących do rzędu Geastrales: gwiazdosza prążkowanego Geastrum striatum DC. i gwiazdosza czarnogłowego Geastrum melanocephalum (Czern.) V.J. Staněk na terenie Bydgoszczy. Obydwa gatunki nie były dotychczas notowane na tym obszarze.
EN
New localities of Geastrum striatum and G. melanocephalum were found in the Botanical Garden of the Kazimierz Wielki University in Bydgoszcz. According to the Polish Red List of Macromycetes, they belong to the category of endangered species (E). Basidiomes of G. striatum were observed for the first time in 1999. In 2004, seventy basidiomes were recorded near Pseudotsuga menziesii, but in 2009, only five basidiomes were found in this location. Basidiomes of G. melanocephalum were found under the canopy of Fraxinus excelsior in summer 2010. In the consecutive years (2011-2013), the fungus was observed again in the same place, however, the number of basidiomes was smaller. In summer 2010, G. striatum occurred in the vicinity of the G. melanocephalum site. This confirmed the findings of other researches who observed co-occuring of G. striatum and G. melanocephalum.
EN
This preliminary study examined the arbuscular mycorrhizal (AM) status of native plant species in the Molinia meadows of Folusz in the Kujawy region, Poland. Root samples from ten plant species characteristic of Molinia meadows (Betonica officinalis, Dianthus superbus, Galium boreale, Inula salicina, Ostericum palustre, Sanguisorba officinalis, Selinum carvifolia, Serratula tinctoria, Silaum silaus, and Succisa pratensis) were collected in August 2014. Root colonization by AM fungi was considered an indicator of symbiosis development. AM was found in all plant species examined. The frequency of mycorrhizal structures ranged between 68% and 99%. The intensity of mycorrhizal colonization in roots varied with the plant species, ranging between 3.9% (O. palustre) and 40.1% (B. officinalis). To our knowledge, this is the first study to examine the mycorrhizal status of three species: D. superbus, O. palustre, S. carvifolia. Because AM colonization depends on plant genotype and environmental factors, further studies should examine seasonal variability in plant root colonization and the compositions of AM fungal communities, which may serve as indicators of site conditions
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