A Békés Megyei Múzeumok Közleményei 34. (Békéscsaba, 2011)
Deli Tamás - Lodmáyer Nelli: A nagy gombafű - Androsace maxima L. - gyomai populációjának állományváltozásai 2008 és 2011 között
Deli Tamás - Lobmáyer Nelli Changes in Population of the Big Mushroom Grass (Androsace maxima) in Gyoma from 2008 to 2011- Tamás Deli - Nelli Lobmáyer - Resume The big mushroom grass (Androsace maxima) is one of our rare loess plants which primarily grow in open loess fields or in parts of erodible loess walls which are more or less free of vegetation. In our country, few verified growing populations of the species are known. In the Great Hungarian Plain only three presences are known, the biggest of which is located in the Gyoma section of the dam of the Triple Körös river. This population has been observed for six years now and the changes in stem density have been recorded for 4 years. The number of individuals of the population has increased steadily in the period from 2008 to 2010. Based on our calculation in 2010, the initial stem density of the species was extended to almost 70 000. Following this tremendous growth, the population produced a drastic fall in 2011: stem density has fallen back to that calculated in 2008. Despite such changes in the total number of individuals, the spatial growth of the population, i.e. the spread of the species, both to the north and the south, has been documented on the dam section examined. In spite of the significant fluctuation of the individuals of the big mushroom grass, the population in Gyoma is considered stable and capable of spreading. We believe, the species is in good position in terms of natural protection. The plant population having its habitat in the Körös-Maros National Park, requires no intervention or special treatment for survival or possible spread. Deli Taniás Békés Megyei Múzeumok Igazgatósága H-5600 Békéscsaba, Gyulai út. 1. E-mail: deli@bmmi.hu Lobmáyer Nelli E-mail: alvella@citromail. hu 32
