Abstract
A new species of Chrysosphaera - Ch. sieminskae has been found in Poland. It is an alga forming compact colonies consisting of single cell structures settled down at Testacea's transluscent carapace (e.g. Euglypha, Centropyxis, Difflugia). The new species, which grows on specific animal host and is characterized by a peculiar organization of colonies, differs in shape and size of its cells from all other taxons belonging to the same genus. This new species has been found in the conditions of poor fen habitats, in water bodies at pH from 3.9 to 5.0.
Keywords
Chrysosphaera; Chrysophyceae; new species; poor fen