Aglaothamnion priceanum is a small inconspicuous filamentous, deep pink coloured red seaweed, with a soft but not flaccid texture. Thalli consisting of small groups of erect axes, 0.2 - 0.8 cm high, attached by disk-like filamentous holdfasts or endophytic rhizoidal (root-like) filaments. Erect axes are flattened, with a single principal axis and a linear to irregularly fan-shape (flabellate) outline.Identification of single specimens can be difficult, so if possible a number of thalli should be collected. However, the species is fairly easily distinguished using a microscope.

European waters (ERMS scope), Irish Exclusive economic Zone, United Kingdom Exclusive Economic Zone

 Confined to the sublittoral where it grows mostly on small perennial algae and blades of Laminaria hyperborea as an epiphyte, and also on bedrock at depths of 5-30 m. Tolerates moderate to extreme wave exposure.