Description: Thallus endophytic within the host, on the surface a cushion-like pad of up to 3 mm in diameter bearing complanate blades to 1.8 mm long.

Habitat: Hemiparasitic on Erythroglossum laciniatum to depths of 15 m.

Distribution: British Isles: Kent, Somerset, Pembroke, Kerry, Mayo and Donegal. Europe: France.

Distribution Map from NBN: Asterocolax erythroglossi at National Biodiversity Network mapping facility, data for UK.

iNaturalist: Asterocolax erythroglossi at iNaturalist World Species Observations database.

WoRMS: Asterocolax erythroglossi at World Register of Marine Species. Accepted name: Erythroglossum erythroglossi (Feldmann & G.Feldmann) Guiry & M.J.Wynne, 2021. AphiaID: 1639659.

Classification: Biota; Plantae; Biliphyta; Rhodophyta; Eurhodophytina; Florideophyceae; Rhodymeniophycidae; Ceramiales; Delesseriaceae; Nitophylloideae; Phycodryeae; Asterocolax