Masses of fine branching filaments set within a mucilage sheath (the mucilage may be difficult to see, and envelopes the whole thallus). The thallus as a whole, including the mucilage, may be hemispherical or branched.
Chaetophora, Kakanui River, X6. Photo: Otago Regional Council & Manaaki WhenuaChaetophora, Kakanui River, X50. Photo: Otago Regional Council & Manaaki Whenua