As a result of a bryological exploration carried out in 2009 within the Kocioł Małego Stawu glacial cirque a number of 90 moss species was recorded. Together with fragmentary notes collected in 1999, 2003 and 2007 the contemporary moss flora concerns 105 species (the list of mosses with a brief description of habitats is provided). 88% of them (92 species) were noted on no more than 25% of the plots (with 32 found exclusively once) and only 13 species were noted more frequently. The latter are widespread within the whole range of altitude and exposition as well as in the majority of plant communities what makes bryophyte vegetation in the glacial cirque rather monotonous in appearance. Species recorded showed visible substrata specialization: 80 taxa (76% including 32 sporadic species) occurred only on one type of substratum. Rocks and boulders appeared to be the richest in the number of species 34 species (with 28 occurring exclusively on this substratum) and coniferous litter and rotten leaves of grasses and ferns 24 species (17 exclusive). Three plant communities were the richest in species: high subalpine grasslands of Crepido-Calamagrostietum villosae community 48, spruce forest of Piceetum hercynicum community 41 and dwarf-pine thickets Pinetum mugo sudeticum community 40. The number of species noted in other plant communities was less than 30. The richest in species phytocoenoses occupied the most area within the glacial cirque and they showed rather high floristic similarity. The comparison of bryo-floristic data from two periods: 18691998 and 1999 2009, showed essential changes in species richness and composition the list of mosses increased by 69 taxa but 50% of the previously reported flora was not refound. The most of species reported for the first time at the beginning of the 21th century were noted in the Karkonosze Mts just in the 19th century on the natural sites. Synanthropization process manifesting in appearance of hemerophilous species, not occurring naturally in the Karkonosze Mts, is limited to the surroundings of the Schronisko Samotnia chalet and strictly associated with mortar or concrete usage. Ruderal species were not observed in other parts of the glacial cirque. It suggests that tourist usage of the area has not influenced on floristic composition of the Kocioł Małego Stawu glacial cirques moss layer.
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