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The paper contains a list of 39 liverwort species collected on decaying wood (logs, stumps and snags) and on tree-fall disturbances (root plates, pits and mounds) in forest communities in the Karkonosze. Three of these species are threatened in Poland: Cephalozia catenulata, C. leucantha, Marsupella emarginata and three are partially protected by law: Cephalozia catenulata, Bazzania trilobata i Ptilidium...
Carex humilis is one of the rarest vascular plants in Lower Silesia. It has been observed only on 5 locations: 1 in the lowland and 4 in Sudety Foreland. 2 of them have historical value only. Existing populations are small and isolated, moreover, shaded plants hardly produce seeds. The species is critically endangered.
Two new for Wrocław localities of Artemisia annua L., the species not recognised since 1976 in this city, has been found. The plant grew on a sack with sand, on railway and on a new sidewalk near a church. Formerly it was reported within Wrocław city limits several times, usually from rubbish. This paper presents short description of this species, its ecological and climatic requirements, information...
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