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This document presents new sites of two invasive moss species; Campylopus introflexus and Orthodontium lineare. These species had previously been found on only three sites near Łódź. Two new sites have been identified in the city of Łódź.
Two localities for Huperzia selago subsp. arctica are recorded from Lithuania, to the south of its known distribution area. The habitats of this subspecies are cutover peatlands whose natural vegetation was disturbed 6-8 years ago during peat exploitation. One of the dominant species of latest vegetation cover is the invasive bryophyte Campylopus introflexus. Characteristics of the habitats of H. selago subsp. arctica and the frequency of this taxon in populations were analysed.
The paper presents a brief review of published so far and recently recorded unpublished bryological data concerning the distribution in Poland of two neophytic (sensu Meusel 1943) mosses: Campylopus introflexus (Hedw.) Brid. and Orthodontium lineare Schwaegr.to estimate their current influence on native bryoflora. The data clearly indicate the constant spreading of these species towards the east, however, there is no direct evidence that they have been limiting the occurrence of native moss species. They are acidophilous species, so the acidification of the environment probably promotes their expansion. Maps of the most current distribution of Campylopus introflexus and Orthodontium lineare in Poland (in a system of ATMOS-grid squares) are provided, as well as a description of the first locality in Poland of another European bryo-neophyte species Leptophascum leptophyllum Mull. Hal.
Abundance of microorganisms and their communities’ structure in disturbed peatlands characterized by different chemical properties and plants cover were studied. Naturally regenerating four disturbed peatlands from different regions of Lithuania were selected for the investigation. The aim of the study was to investigate invasive moss Campylopus introflexus cover effect on microbial communities. The peat under Eriophorum angustifolium, Polytrichum strictum and bare peat were sampled for the comparison. The abundance of microorganisms in sampling plots depends on the content of total nitrogen, potassium, soil organic matter and pH as well as on growing plants. In the peat under C. introflexus, the number of ammonifying and mineral N assimilating bacteria was significantly lower in comparison with other plants or bare peat. The results on fungi abundance in peat under C. introflexus allow to predict that the distribution of moss doesn‘t affect negatively the development of fungi. A total of 236 fungal strains belonging to 21 genera were isolated from the studied peat samples. Species from the Penicillium, Trichoderma and Mortierella genera dominated among them. The structure of microbial communities varied in separate peatlands and under various plants. However, all examined microorganism communities seemed to be able adapted to organic matter degradation.
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