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The paper presents a water plant community new to Poland - Nymphaeetum albae Vollmar 1947 em. Oberd. in Oberd. et al. 1967, belonging to the i class. It was discovered in fishponds in Pokój near Namysłów, Lasowice Małe near Kluczbork and small ponds in Staniszcze Małe near Opole in Silesia (SW Poland). Floristic composition and ecological requirements of this association are presented in the paper. Nymphaeetum albae is considered to be a rare and endangered plant community in Europe.
This paper discusses the floristic structure, distribution and habitat requirements of a new aquatic syntaxon, Stuckenietum amblyphyllae ass. nova. Patches of the Stuckenietum amblyphyllae association occur in the Pamir Alai Mountains in Middle Asia (Tajikistan). The biotope of this community represent high mountain rivers and ponds at the bottom of glacial river valleys situated at elevations between 1900 and 3800 m. Patches of the Stuckenietum amblyphyllae association are characterised by a clear predominance of the typical species, i.e. Stuckenia amblyphylla, which occupies an aerial extent of between near 40 up to 90% of the surface studied. Patches of the community are poor in species, comprising a maximum of five taxa. Among associated species mainly rush, aquatic, meadow and marsh taxa have been noted. The Stuckenietum amblyphyllae community prefers cold, open, alkaline waters with medium flow-rate, ranging in depth from 15 to 75 cm. It is also, but rarely, found in the mountain ponds. Together with the Stuckenia filiformis community it designates in the Pamir Alai Mountains the upper limit of aquatic vegetation.
The paper presents a community of water plants that is new to Poland, Veronico beccabungae-Callitrichetum stagnalis (Oberd. 1957) Müller 1962. This community belongs to the class Potametea. It was discovered in the village of Odrowąż near the town of Krapkowice in Silesia (SW Poland). Veronico beccabungae-Callitrichetum stagnalis in Poland occurs within an irregularly shaped shallow underwater spring, located in the distal part of the Oder River’s flood terrace. This plant community covered 0.2 ha in 2008. Callitriche stagnalis predominated in this community. Species such as Callitriche hamulata and Callitriche verna occurred less frequently. An average of five species were counted in a relevé. Alkaline sediments (pH 8.03) occur in the substratum, but sediments with a lower pH value (7.73) occur in the spring’s outflow zone towards the Odra River. Water in the spring, where Veronico beccabungae-Callitrichetum stagnalis occurred, has a medium mineralisation but is rich in dissolved compounds. The condition of this community within the studied habitat could be evidence for highly adaptive abilities and this community's good adjustment to the natural conditions. Veronico beccabungae-Callitrichetum stagnalis is a rare and endangered plant community in Central Europe. The locality of this plant community in Poland should be given species protection.
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