Abstract
Freshwater red algae <em>Hildenbrandia rivularis</em> has been noted for the first time in central Poland near the Lodz agglomeration. Until now, this alga was recorded only in mountain and Polish Lowland areas. The wide range of habitat conditions influencing the occurrence for this protected species has been determined in the spring niche. The possible threat to habitat where <em>H. rivularis</em> occurs, is connected with construction and exploitation of the A2 highway.
Highlights
Ag. 1851 belong to phyllum Rhodophyta, class Florideophyceae. It represents of red algae occurring in fresh inland waters
The first stand of the H. rivularis noted in central Poland was in the springs niche of the £ód Hills scarp
In the bottom of the Ciosny spring area there are stones coated with red color, shell-form thalli of H. rivularis (Fig. 4a, b)
Summary
In the second half of the twentieth century new stands of H. rivularis have been recorded in flowing waters from mountainous areas (Starmach 1969a, 1982). The occurrence of H. rivularis has been noted in standing waters, within the littoral zone of lakes: in Jeziorak Lake (Bohr 1968), Raduñskie Lake and Ostrzyckie Lake (Markowski 1980) and Koleñskie Lake (Go3dyn 1985) (Fig. 1). The first stand of the H. rivularis noted in central Poland was in the springs niche of the £ód Hills scarp.
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