Description: Small flat and thin thallus closely attached to stone growing to 3 cms in diameter. Margin without orbital ridges. Conceptacles only slightly raised above thallus surface.

Habitat: Very rare. Epilithic on stones, sublittoral to 11 m depth. Known from only a few specimens.

Distribution: Southern England.

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

iNaturalist: Exilicrusta parva at iNaturalist World Species Observations database.

WoRMS: Exilicrusta parva at World Register of Marine Species. Accepted name: Exilicrusta parva Y.M.Chamberlain, 1992. AphiaID: 146375.

Classification: Biota; Plantae; Biliphyta; Rhodophyta; Eurhodophytina; Florideophyceae; Corallinophycidae; Hapalidiales; Hapalidiaceae; Melobesioideae; Exilicrusta