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The Population is probably extinct by now, as the small ditch dried out each summer the last few years. The ditch flows through a pipe into the "Riedbach", where Pacifastacus leniusculus is already established. The pipe section probaly prevented P. leniusculus from entering the ditch where A. torrentium was able to survive a little longer.

Stängel mit 1 endständigem Ährchen
Stängelblatt mit aufgeblasener Scheide
Vorkommen im Wurzacher Ried

http://www.blumeninschwaben.de/Einkeimblaettrige/Sauergraeser/wollgras.htm#2

Stem with 1 terminal spikelet
Stem leaf with inflated sheath
Occurrence in the Wurzacher Ried