FIG. 7 in A study of the morphology and distribution of four Achnanthidium Kütz. species (Bacillariophyta), implications for ecological status assessment, and description of two new European species

FIG. 7. — Achnanthidium sieminskae Witkowski, Kulikowskiy & Riaux-Gob.: A-W, specimens from Brunnsee, Germany; X-AT, specimens from Plansee, Austria; AU-BC, specimens from Fischkaltersee; BD-BI, specimens from Ammelsheiner See; BJ-BM, specimens from Harthsee; BN-BQ, specimens from Speicher Dreiweibern; B-BC, BE-BI, BK-BM, BO-BQ, LM views of valves; A, BD, BJ, BN, LM views of frustules in girdle view. Scale bar: 10 µm.