Staurastrum arnellii Boldt
Reference: Coesel & Meesters 2013
Compare with: Staurastrum hirsutum var. pseudoarnelli, Staurastrum scabrum
Remarks: In 1885 Robert Boldt described Staurastrum arnellii from material that was collected along the Yenisei River on one of the botanical expeditions of the famous polar explorer Nordenskjöld. West, West et Carter 1923 and Coesel & Meesters 2007 associated this description with a certain desmid that is very common in Europe. Peter Coesel saw so many similarities with Staurastrum hirsutum Ralfs that he made S. arnellii a variety of this species, but later he came to the conclusion that the species of Boldt was something different than the specimen commonly encountered in European samples. Rupert Lenzenweger (Lenzenweger 1997) did find the true S. arnellii in Austria. That meant that S. arnelli was suddenly less common in Europe and only known from Austria. So it was a surprising to find Staurastrum arnelli also in the Netherlands, incidentally in a ... rain puddle in Amsterdam!
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