Description: Minute filaments, branched, creeping in the tissues of the host. Appearing as small spots.

Habitat: Very rare. Endophytic in Sauvageaugloia griffithsiana.

Distribution: Britain and Ireland. Europe: France. Atlantic coast of North America: Canada.

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

iNaturalist: Streblonema tenuissimum at iNaturalist World Species Observations database.

WoRMS: Streblonema tenuissimum at World Register of Marine Species. Accepted name: Microspongium stilophorae (P.Crouan & H.Crouan) Cormaci & G.Furnari, 2012. AphiaID: 707754.

Classification: Biota; Chromista; Harosa; Heterokonta; Ochrophyta; Phaeophyceae; Fucophycidae; Ectocarpales; Chordariaceae; Streblonema