Compare Stephanodiscus alpinus
Compare
Stephanodiscus hantzschii has nearly flat valves and finer areolae. Stephanodiscus agassizensis and S. oregonicus have fascicles that become at least triseriate at the valve margin. Spines are often absent from marginal interfascicles in S. agassizensis.
LM scalebar = 10 µm
Diameter
13.8-30.8 µm
13.8-30.8 µm
Striae in 10 µm
12-14 fascicles
12-14 fascicles
Stephanodiscus hantzschii
Diameter
11.8-20.3 µm
11.8-20.3 µm
Striae in 10 µm
6-9 fascicles based on circumferential count
6-9 fascicles based on circumferential count