Phylum: Charophyta Family: Desmidiaceae
Xanthidium antilopaeum f. javanicum (Nordstedt) Coesel
Coesel & Meesters (2007) record this as 'var. hebridarum f. javanicum'. Variety hebridarum is noted for three spines on the angles of the cells. Forma javanicum has four; the apical ones are twinned. An acidophile, apparently not uncommon
References:
Coesel, P.F.M. & Meesters, K.J. (2007) Mesotaeniaceae and Desmidiaceae of the European Lowlands