One of the more unusual plants I have come across recently in the Rye Bay area is the terrestrial blue-green alga Nostoc commune. I found large quantities of it recently scattered about on the mossy concrete surface of an abandoned farmyard at Guestling. Most of the plants were several centimetres across. It is rubbery, gelatinous stuff that swells up when wet and is the algal component of many of our lichens.
The plant is, apparently, eaten with relish in some parts of the world and is reputed to be good for reducing cholesterol levels. I haven’t tried it yet, but it probably resembles edible seaweeds to which it is closely related. In parts of France it is known as ‘crachat de lune’, which I think means ‘moon spit’.
It does not seem to be common in East Sussex and is more a plant of the north and west. In the case of the Guestling colony I suspect materials from one of our beaches had been incorporated with the concrete. My thanks are due to Simon Davey, the Sussex Lichen Recorder, for helping with the identity.
