Ulva linza

Thallus sheet-like (elongated oval to linear), smooth, simple or occasionally sparsely branched at base, solitary or aggregated, light-green, to yellowish-green, 20-45(-90) сm long, to 12 cm wide. Blades with long, cylindrical stipe, with cuneate or cordate base; distromatic, flattened, hollow only in stipe and along the margins. Margins entire, undulate. Cells in surface view mostly in longitudinal rows, disordered in the upper part; angular, roundish-polygonal, 10.5-21.5×8-19 mm. In transverse section, cells rectangular with roundish corners, 21-24 mm high, to 20 mm wide. Pyrenoids 1(-2) per cell. Holdfast small, inconspicuous, disc-like. Growing on stones, rocks, muddy-sandy bottom, in the middle and low intertidal zones to subtidal (15 m), in brackish and polluted waters, in protected and semiprotected shores.

Worldwide, arctic to temperate latitudes of south hemisphere.