Contributions to the knowledge of the French desmid flora .1. New and noteworthy taxa from the Central and Eastern Pyrenees

The examination of 75 samples collected in 1986 and 1990 in the central and eastern French Pyrenees revealed a number of new, rare or noteworthy desmid taxa. In the present paper 22 taxa, belonging to the genera Gonatozygon, Closterium, Actinotaenium, Euastrum and Cosmarium are depicted and discussed. Of four taxa name and/or taxonomic status are changed: Actinotaenium kriegeri stat. nov., Cosmarium difficile var. messikommeri comb. nov., Cosmarium horizontale stat. nov. and Cosmarium simplicius var. puerile nom. nov. & stat. nov. Two taxa are newly described: Cosmarium arrense spec. nov. and Cosmarium neouviellense spec. nov.