Asterionella

Asterionella gracillima
Asterionella is commonly found in the plankton of slow moving waters. It often grows in star like clusters.

1a. Larger terminal swelling 1.5 to 2 times wider than the other P, Cu -------------------------- Asterionella formosa
1b. Larger terminal swelling less than 1.5 times wider than the other --------------------- Asterionella gracillima P, taste, pH-4.0-9.0 opt 2.7-8, E or M

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