Radiate

Pyrenoid

 

Raphe

Striae angled or curved toward the central nodule are called 'radiate' striae. Striae may be radiate in a specific part of the diatom valve. For example, the striae may be radiate throughout the valve, radiate only at the center valve, radiate only at the ends, etc.

Citations

Barber, H.G. and Hayworth, E.Y. (1981). Guide to the Morphology of the Diatom Frustule. Freshwater Biological Association, 112 pp.

Image Credit: Sarah Spaulding

The striae of this Cavinula sp. are slightly radiate.

Image Credit: Marina Potapova

The striae of Navicula angusta are radiate near the center of the valve, becoming convergent at the ends.