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In the upper Danube river-system, but also in some more watercourses of the German lower mountains range, an endolithic filamentous cyanobacterium is a prominent compound of the phytobenthos. These filaments penetrate limestones in the river bed and form brush-like endolithic layers of about 0.5 mm in depth. There are similarities between this taxon and approximately 10 other filamentous Cyanophyceae in terms of the width of the trichomes, the geometry of the cells and the shape of the apical cells. However, none of these species allow for a direct and clear-cut identification, and a precise taxonomic determination has therefore been unresolved until today. In order to make progress in this matter, it is necessary to get a better insight into the boring behaviour of this inhabitant and into the endolithic arrangements of the filaments. For
this purpose, special preparation methods and SEM examinations were applied. The results of these procedures as well as critical comparisons with taxonomic properties of similar phormidian taxa, and the special demands on physico-chemical water conditions, led to the conclusion that the taxon in question cannot be assigned to a known species, but must be considered as an independant species. It is here described as Phormidium ingrediens species nova.
Vor 20 Jahren, am 15. Februar 1990, wurde auch die Baar von einem verheerenden Hochwasser heimgesucht. Ganz ähnlich war die Situation im Frühjahr 1995.
Das Auffangbecken bei Wolterdingen, an dem seit Jahren gebaut wird, die Flutmulde und di e aktuell en Arbeiten im Gewann Marquartswiesen in Bräunlingen oder
die Dammaufschüttungen in Hüfingen sollen helfen, in Zukunft solche Katastrophen zu verhindern oder zu mildern. Drei verschiedene Schilderungen von Hochwassern in Bräunlingen und Hüfingen aus dem 17., 18. und 19. Jahrhundert
zeigen, wie sich die Wahrnehmung geändert hat, was als Formalität galt und was
als Katastrophe.