The spores of stoneworts can survive for hundreds of years, only to restart the plant’s life cycle when the the right conditions materialise. Stoneworts are a feature of the gravel beds of the Cotswold Water Park, so I am looking at them closely at the moment, developing ideas for a project there. This beautiful structure is a oogonium, the female reproductive part of the plant. What is interesting, considering the ideas of Theodor Schwenk about how many biological structures take the form of water, is how this oogonium resembles the form of a vortex in water, swirling around a central core. Just as water going down the plughole in the northern hemisphere goes one way, and the opposite way in the southern hemisphere, I wonder whether the same applies to stoneworts. I must find out.