Description: A minute outgrowth, conical or irregular, of one or more blades of Apoglossum ruscifolium, flattened and no more than 0.6 mm long and 0.4 mm wide, margin smooth or dentate.

Habitat: Extremely rare. Parasitic on the stipes and midrib of Apoglossum ruscifolium, in the sublittoral to 5 m.

Distribution: Known only from Dorset and Glaway.

Key Identification Features:

• Parasitic on Apoglosum ruscifolium.

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

iNaturalist: Apoglossocolax pusilla at iNaturalist World Species Observations database.

WoRMS: Apoglossocolax pusilla at World Register of Marine Species.