In addition, the flora includes several pondweed Potamogeton spp. and delicate stonewort Chara virgata.
Pools are periodically dug in selected dune slacks on the Sefton Coast in order to provide habitat for threatened species including lesser bearded stonewort.
It has been found to contain lesser bearded stonewort which is a priority species for Northern Ireland.
He has also recently found an extremely rare stonewort in a Worcestershire pond and would like to obtain more records of the group.
Although starry stonewort appears to tolerate slightly saline conditions, its performance may decline if salinity levels increase.