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Clumps of trees left on the clear-cuttings have an important role in protecting populations of endangered plant species against destruction during silviculture activities. The aim of this study is to describe the changes in the area of the Lycopodium annotinum patches. The area of L. annotinum patch in clump of trees, have been significantly reduced during 5 years after clear-cut. In the first year of the observations, the studied population occupied an area of 69.8 m2 whereas in 2012, it was only 37.5 m2. Most of the shoots were withered away on the south side of the clump. The probable reason was too strong insolation. Shoots that survived were located in the north part of the clump – shielded by young trees and shrubs layer. At this time, the control patch of L. annotinum located inside the forest increased its area. Before the clear-cuttings, the annual growth of vertical shoots of clubmoss was higher in the patch located in future tree clump. After the clear-cutting, growth of shoots in this patch was shorter than in patch located all the time inside the forests. The most effective growth was observed in the third studied patch located in the clear-cutting border. The explanation for this phenomenon could be the higher humidity of habitat on this site. Clumps of trees left after the clear-cutting contribute to the protection of endangered populations, but do not eliminate the significant microhabitat changes. The clubmoss patches located in moist habitats are more likely to survive even if they are partially exposed to the sunlight.

Lycopodiella inundata is an endangered, wetland species, able to occur in secondary, anthropogenic habitats. The article presents five-year changes in the occurrence of Lycopodiella inundata on the one of the largest stands in Central Poland. Chosen parameters of population were examined in different stages of vegetation succession. In open thickets the number of fertile stems was near three times higher and amounted above eight hundred fertile stems per square meter. In contrast, in patches with dense herb- and shrub-layer, the low number of fertile stems of L. inundata, have been observed. At anthropogenic sites, where L. inundata occurs, active protection should be made for the inhibition of succession and for the rejuvenation of habitat.

The conducted study aimed to show the differences in the process of sporulation at two populations of Lycopodium annotinum L. occurring within the governmental forests in the habitats: undisturbed and disturbed by economic treatments. The study was conducted in 2008-2011 in the southern part of the Krakowsko-Czestochowska Upland. It concerned the number of observations of sporophylls occurring during the year. There was also examined till which months within the year spores are released. The study also included observations of the lot of sporophylls which released the spores. Studies have shown that in the undisturbed habitat during the year there occurred 6 times more sporophylls than in the disturbed habitat. It was also observed that the period of their appearance in the undisturbed habitat was prolonged compared to literature data, and lasted until November 2008. Such a late appearance of sporophylls was not in the disturbed habitat, where the appearance of sporophylls was observed only until July 2008. However, only in the disturbed habitat there was observed occurrence of sporophylls in March 2009. In the undisturbed habitat spore release process lasted until October 2008, while in the disturbed one until September. In this habitat there was also observed that 28% of marked shoots with strobili died before the release of spores. This situation was not observed in the undisturbed habitat. The study also showed that in the both positions, after releasing the spores, all the shoots died within 3 years, however, in the disturbed habitat shoots died much faster than in the undisturbed one.