Arrhenechthites novoguineensis ssp. dolichophylla (Mattf.) J. Kost.
Homotypic synonym according to GBIF classification (Originally found in sources as accepted taxon within Arrhenechthites novoguineensis (S.Moore) Mattf.)
Arrhenechthites tomentella Malta
Doubtful according to GBIF classification (Possible variant of Arrhenechthites tomentella Mattf.)