Spaulding, S.,
Edlund, M.
(2008).
Hydrosera.
In Diatoms of North America.
Retrieved May 01, 2026, from https://diatoms.org/genera/hydrosera?x-craft-preview=409442409a997390693ff24c7010fd6f1c96fb56f8f091fa016a63de9a54aaccecpiqubknd
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...