Artur Pliszko

A new locality of Solidago × niederederi Khek (Asteraceae) in Poland.

Abstract Solidago ×niederederi is a natural hybrid between S. canadensis and S. virgaurea, which occurs sporadically in synanthropic habitats together with the parental species. The hybrid was reported from seven countries in Central and Northern Europe and its presence emphasizes the invasive character of S. canadensis. A new locality of the hybrid was found in Mieruniszki village in the Zachodniosuwalskie Lakeland in NE Poland in 2011 (ATPOL square: FB06). Solidago ×niederederi grew on fallow land, at the edge of planted birchen shrubbery and its population comprised two small clumps. Current data suggest that the hybrid is a casual alien in the Polish flora, however, it has the potential to become established by clonal growth or restricted sexual reproduction.

Floristic composition of vegetation in habitats suitable for Erigeron × huelsenii (Asteraceae)

Abstract The paper provides data on the floristic composition of vegetation in anthropogenic habitats suitable for Erigeron × huelsenii, a spontaneous hybrid between the alien E. canadensis and native E. acris s. str. The study is based on 21 phytosociological relevés (vegetation plots) of 5×5 m size made in 2013-2014 in the Polish part of the Lithuanian Lakeland (north-eastern Poland) using the Braun-Blanquet method. The plots were taken on a roadside verge, a roadside slope, in abandoned sand and gravel pits, and on arable fields with grass-legume mixtures. There are 91 species of vascular plants, four species of bryophytes, three species of lichens, and one species of cyanobacteria. Vegetation is represented by populations of species typical of plant communities from the classes Stellarietea mediae, Artemisietea vulgaris, Koelerio-Corynephoretea, Festuco- Brometea and Molinio-Arrhenatheretea. Two floristic groups recognized from hierarchical cluster analysis and principal component analysis correspond with ruderal and segetal habitats. The study reveals that arable fields with grass-legume mixtures on sandy soils can be very suitable for E. × huelsenii.

Male and female reproductive success in natural and anthropogenic populations of Malaxis monophyllos (L.) Sw. (Orchidaceae)

Abstract In the presented study, male and female reproductive success was analyzed in relation to the population size, floral display and pollinators’ availability in natural and anthropogenic populations of the orchid Malaxis monophyllos (L.) Sw. Our results indicated significant differences between all investigated populations in parameters of floral display, including heights and number of flowers per inflorescence, as well the number of flowering individuals and their spatial structure. Additionally, populations differed both in male (pollinia removal) and female (fruit set) reproductive success, but only the fruit set clearly differentiated anthropogenic and natural populations. Despite the average flower number per plant being significantly higher in two of the anthropogenic populations, it was not related to the fruits set, which was significantly lower there. Moreover, our preliminary study concerning the potential pollinators of M. monophyllos showed a higher contribution of flies in natural habitats than in anthropogenic ones. Thus, we can suspect that the main factors influencing the level of female reproductive success in M. monophyllos populations are abundance of effective pollinators, as well as flower visitors, which may have resulted in a different level of pollen discounting in populations. Therefore, further studies concerning breeding system and pollination as important forces that shape demographic processes in M. monophyllos populations are necessary. Our results also indicate that suitable conservation methods in M. monophyllos should always include the preservation of potential pollinators, especially in these new, secondary habitats.

A New Polish Record of Dracocephalum Thymiflorum

Abstract Pliszko A., 2014: A new Polish record of Dracocephalum thymiflorum [Nauja Dracocephalum thymiflorum radvietė Lenkijoje]. - Both. Lith., 20(1): 64-66. The paper presents a new record of a rare casual alien Dracocephalum thymiflorum L. (Lamiaceae) in Poland. A small population consisting of 42 generative individuals of this species was found in May 2013 on railway embankment in Okuniowiec village near the northeastern boundary of the town of Suwałki in the Polish part of the Lithuanian Lakeland. The current distribution (according to the ATPOL cartogram grid) is given, and introduction pathways via railway transport and contaminated crop seed are recognized Santrauka Maža Dracocephalum thymiflorum L. populiacija buvo aptikta 2013 m. gegužę ant geležinkelio pylimo Okuniovieco kaime (Podlasko vaivadija) netoli šiaurrytinės Suvalkų miesto ribos (ŠR Lenkija). Ši reta atsitiktinė svetimkraštė rūšis šiuo metu konstatuota dvidešimt šešiuose 10 kvadratinių kilometrų dydžio ATPOL kartografinio tinklelio vienetuose. Į Okuniovieco kaimą D. thymiflorum greičiausiai pateko netyčia su geležinkeliu gabenamais kroviniais iš Lietuvos

Erigeron acris L. subsp. angulosus (Gaudin) Vacc. (Asteraceae), a new taxon in the flora of Poland

Abstract The paper reports for the first time the occurrence of Erigeron acris subsp. angulosus in Poland. This rare European temperate plant was found in August 2014 in a former sand and gravel quarry, close to the Sobolewo reservoir in the town of Suwałki, north-eastern Poland. Species composition of the habitat is characterized by a phytosociological relevé based on the Braun-Blanquet method, diagnostic characters in comparison to the morphologically similar E. acris subsp. droebachiensis are presented using scanning electron microscopy imaging, and an identification key for E. acris s. l. in Poland is given.

A new record of Badhamia versicolor Lister (Physaraceae) in Poland

Abstract The paper presents a new Polish record of Badhamia versicolor, a nationally rare and red-listed species of Myxomycetes. It was discovered on the edge of the disused sand and gravel pit (formerly, a gravel mine of the Polish State Railway) in the town of Suwałki, north-eastern Poland. Two small clusters of mature fruiting bodies of B. versicolor were noticed on a bark of living poplar (unidentified species of Populus) and on a fallen leaf of the same poplar tree. Photographic documentation of specimens collected from a new locality is provided.

New and noteworthy vascular plant records from the Polish part of the Lithuanian Lakeland

Abstract This paper provides a list of 40 vascular plant species recorded in 2015–2017 in the Polish part of the Lithuanian Lakeland (north-eastern Poland), using the ATPOL cartogram method. Two native taxa Erigeron acris subsp. droebachiensis and Rorippa austriaca, one established alien Atriplex tatarica and one casual alien Aronia × prunifolia are reported as new to the flora of the region.

Further notes on the distribution of Dittrichia graveolens (Asteraceae) in Poland

Abstract The paper presents a new record of Dittrichia graveolens in Poland. This alien species was found growing on roadside verges in Głogoczów, West-Beskidian Piedmont, southern Poland, in 2016. An updated map of distribution of D. graveolens is provided based on the ATPOL cartogram method, and its pathway of spread along the roads is highlighted. Moreover, the Polish vernacular names “omanowiec” and “omanowiec wonny” are proposed for the genus Dittrichia and the species D. graveolens, respectively.

A new record of Senecio inaequidens (Asteraceae) in Poland

Abstract The paper presents a new Polish record of Senecio inaequidens, a perennial plant native to South Africa. It was found growing on roadside verge in Głogoczów, West-Beskidian Piedmont, southern Poland, on September 22, 2016. A map of distribution of S. inaequidens in Poland is presented using the ATPOL cartogram method and the pattern of its spread along motorways is discussed.

A new record of Spergularia marina (Caryophyllaceae) from southern Poland

Abstract Spergularia marina, a rare native halophyte and nationally vulnerable species, is reported from a new locality in southern Poland. It was found on 14 September 2016 in Mogilany, Lesser Poland Voivodeship, growing between paving stones at the Zakopianka road. Map of distribution of S. marina in Poland based on the ATPOL cartogram method is provided, and its possible pathways of introduction are discussed.