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Stonewort grazed by tadpole

Observed: 4th June 2013 By: Nick UptonNick Upton’s reputation in PlantsNick Upton’s reputation in PlantsNick Upton’s reputation in PlantsNick Upton’s reputation in Plants
Week old Common frog tadpoles (Rana temporaria) grazing Stonewort (Chara sp.) in a freshwater pond, Wiltshire, UK, May.
Top view of Delicate stonewort (Chara virgata), sporangia, with red male antheridia and brown, flask shaped female archegonia, Marlborough Downs, Wiltshire, UK, September.
Delicate stonewort (Chara virgata), a pioneer alga of unpolluted calcareous ponds with stem and leaf like fialments in whorls, Marlborough Downs, Wiltshire, UK, Spetember.
Top view of Delicate stonewort (Chara virgata), sporangia, with red male antheridia and brown, flask shaped female archegonia, Marlborough Downs, Wiltshire, UK, September.
Description:

Horsetail-like alga growing in a small artificially dug pond in the Marlborough Downs, grazed by a frog tadpole. I'm pretty sure this is a stonewort (becoming rare nationally), most likely a Chara species, rather than Nitella sp., but dare go no further on species ID. It matches C globularis and C. virgata quite well, but many species may look similar.

Identifications
Species interactions

No interactions present.