The current nature of forest management in Poland reflects its history and more than 100 years of economic activity affecting forests since independence in 1918. Before that time, different forest management models were used, related to the nature of the Prussian economy in the north of the country, the Russian economy in the central-eastern part, and the Austrian economy in south-eastern Poland. The consequence of these management models, as well as the differing climate zones in which they were used, resulted in varied forest health. Since the end of World War II, forest coverage within Poland‘s new borders has increased from 20.8% to currently 29.6%, mainly as a result of afforestation of wastelands and former agricultural lands. This paper describes changes in the health of forests and their biological diversity in Poland in the context of weather extremes, species composition, forest management, the forest industry, and damage from insects and pathogenic fungi over the last 30 years.

The experiment conducted in the Kampinos National Park since 2015 is aimed at investigating the relationship between the dynamics of black cherry sprouting response and the type and term of implementation of the mechanical elimination procedure. It also identifies macrofungi colonizing trees undergoing eradication. Three treatments, basal cut-stump, cutting (height: ca. 1 m) and girdling, were performed on 4 terms: early and late spring, summer and winter. Each variant was conducted within two plots, and applied to 25 trees, to 600 trees in total. For two consecutive vegetation seasons, sprouts were removed approximately every 8 weeks with the exception of winter-treated trees. Qualitative data were analysed, that is, the number of trees with and without sprouts at subsequent controls, and at the end of the second season, except winter-treated trees. Initially, almost 100% of the trees cut at the base and cut high responded by sprouting. The share of trees without sprouts gradually increased during the following vegetation season, from 3 rd to 5 th repetition of the sprouts removal, depending on the variant of experiment. Girdling contributed to a delay in sprouting. The effectiveness of procedures, expressed as share of trees without sprouts at the end of the second vegetation season, ranged widely (12%-84%), and depended statistically significantly on the date of the treatment. The effectiveness was higher for treatments done in early (average 68%) and late spring (average 74%), as compared to those done in summer (average 35%). Mycological research concerned 600 trees, including those treated in winter, without sprouts removal. Occurrence of 26 taxa of macrofungi was confirmed on 25% of trees; most of them having wood-decaying properties. Chondrostereum purpureum was most frequent, colonizing 9% of trees. Impact of plots varying soil moisture on succession and rate of fungi colonization, and on sprouting response dynamics requires further research.

The paper presents 47 fungi species belonging to the genera <em>Cystolepiota, Echinoderma, Lepiota, Leucoagaricus, Leucocoprinus, Macrolepiota</em> and <em>Melanophyllum</em>, found in Poland, which have been not reported earlier from this area (18 species: <em>Cystolepiota fumosifolia, C. moelleri, C. petasiformis, Echinoderma carinii, E. pseudoasperula, Lepiota angustispora, L. apatelia, L. cingulum, L. cortinarius var. audreae, L. cristata var. felinoides, L. forquignonii, L. rubella, Leucoagaricus cinerascenss, L. ionidicolor, L. sericifer var. sericellatus, Macrolepiota heimii, M. rhodosperma var. rhodosperma, M. venenata</em>) or have been known only from a few localities. For the species new to Poland short descriptions, based on the specimens examined and literature data, are given and their micromorphological characters are illustrated.

The paper presents a list of fifty-five coprinoid fungi found in Poland, which have been not reported earlier from this area (28 species) or are known only from few localities. Four species new to Poland collected in Bieszczady Mts and mentioned, without descriptions, in earlier papers, were also included and described in this publication. For the species new to Poland, illustrations and short descriptions based on the specimens examined and literature data, are given.

The paper presents 32 species of macrofungi new to the Kampinos National Park, found during the studies on fire-damaged areas after the forest fires in 2015. Three species new to Poland were described and illustrated (Calycellina leucella, Exobasidium juelianum, and Gymnopilus decipiens). Four species from Polish red list of macrofungi have been recorded in the Kampinos National Park for the first time: Botryobasidium vagum (R), Geastrum coronatum (V), Helicogloea farinacea (E), Inonotus cuticularis (R). During the current studies 17 pyrophilous species new to the Kampinos National Park were found.

Between 1998 and 2003, 43 forest stands (including 41 reserves) with larch trees were inspected and reviewed in search of <i>Fomitopsis officinalis</i> (Vill.: Fr.) Bond. et Sing. A list of localities, together with short descriptions of the forest sites, is given, and location sketches with the localities are provided. The number of infected trees, their dimensions and health state, as well as the number of recorded fruitbodies, their dimensions and location on the trees, are given.

Continuation of the mycological study of the fire-damaged pine forest in Kampinos National Park in central Poland in 2017 produced interesting new findings. Among the taxa collected, 36 were new to the park, six had not been hitherto reported from Poland (Calycellina araneocincta, Ciliolarina aff. laetifica, Clitocybe metachroides, Galerina cerina f. longicystis, Parasola cuniculorum, Pleonectria pinicola), and the previous status of one taxon (Pleonectria cucurbitula) had been uncertain. Short descriptions based on collected specimens have been prepared for all taxa new to Poland. The current number of taxa of macromycetes identified in Kampinos National Park has reached 1,604.

New records for twenty species of saproxylic tineid moths (Lepidoptera, Tineidae) from the Białowieża Forest (NE Poland) are presented. Most species were recorded on the basis of laboratory breeding of the adult moths from the sporocarps of wood-decaying fungi inhabited by the larvae. Some species were captured using barrier traps or were collected at light. One species, Dryadaula irinae (Savenkov, 1989), is recorded for the first time from Poland and three others, Nemaxera betulinella (Paykull, 1785), Nemapogon fungivorella (Benander, 1939) and Elatobia fuliginosella Lienig & Zeller, 1846, are recognized as new for the fauna of the Białowieża Forest. The current distribution in Poland of each species is briefly discussed, and some remarks on its biology are given