Bahls, L.
(2012).
Haslea.
In Diatoms of North America.
Retrieved December 02, 2024, from https://diatoms.org/genera/haslea
Symmetric Biraphid
Haslea
Valves lanceolate with acute apices
Central costae thickened, forming a narrow fascia
Raphe sternum with asymmetric thickened area in the central valve
Striae crossed by longitudinal strips
Valves are lanceolate with acute apices and a central raphe system. Two or three thickened transapical costae on either side of the valve center form a narrow fascia. The raphe sternum is thickened on one side of the axial area and is fused to the central ribs, giving valves a cruciform appearance. Striae are uniseriate, containing...