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Aulacoseira lirata differs from A. alpigena by coarser areolae (7-13 rows in 10 ┬Ám vs. 15-22 in A. alpigena), generally larger frustules, and spines branching at the end.

LM scalebar = 10 µm
Aulacoseira lirata LM4 Aulacoseira lirata LM7 Aulacoseira lirata LM6 Aulacoseira lirata LM5 Aulacoseira lirata LM3 Aulacoseira lirata LM2 Aulacoseira lirata LM1
Diameter
6-23 µm
Width Range
5-14 µm
Striae in 10 µm
7-13

Aulacoseira alpigena

(Grunow) Krammer 1991

Aulacoseira alpigena LM2 Aulacoseira alpigena LM1 Aulacoseira alpigena LM4 Aulacoseira alpigena LM3 Aulacoseira alpigena LM5 Aulacoseira alpigena LM6 Aulacoseira alpigena LM7
Diameter
4-15 µm
Width Range
4-7 µm
Striae in 10 µm
15-22