Fifty years of botanical investigation in the region of Podblanicko (Central Bohemia) published in the regional collection Nature and History of Podblanicko Region.
Natural rubber is currently produced largely from the tropical Rubber Tree (Hevea brasiliensis), which is grown on large plantations in south-eastern Asia. However, some rubber-forming plants can also be found in the temperate zone. The most important species is the tiny dandelion named Koksaghyz or the Russian Dandelion (Taraxacum koksaghyz), belonging to the Asteraceae family and native to south-eastern Kazakhstan. This plant has an exciting history and recently has been intensively researched as an alternative to Hevea rubber. This article describes value of this member of Asteraceae family for the human community. and Tomáš Černý.
The diversity of lichen flora is presented and compared with the neighbouring count - ries. The main phytogeographic elements are outlined and illustrated with representative examples. Changes in the flora along with the main causal factors are discussed. and Jiří Liška.