Spaulding, S.,
Edlund, M.
(2008).
Hydrosera.
In Diatoms of North America.
Retrieved September 30, 2023, from https://diatoms.org/genera/hydrosera
Centric
Hydrosera
Valve margin appearing doubly triangular
Porefields three, with pseudocelli
Rimoportula distinct
Hydrosera is a large multipolar, centric diatom. Frustules are heavily silicified. Valve margins appear to be in the shape of two superimposed triangles. A distinct rimoportula is present. Porefields, containing pseudocelli, are positioned at the three poles of one of the apparent triangles. Frustules form large zig-zag colonies, joined...