I am a big fan of John Wyndham and I have also found that he is popular author amongst Bookcrossers. This is one I haven't read and I picked it up in a Charity Shop in Abergavenny.

Synopsis:

It came from a lichen. When biochemist Francis Saxover discovered its remarkable properties, the implications terrified him. But Diana Brackley foresaw the coming of a new evolutionary order and with it, a revolution.

Not the best book I've read by John Wyndham, but yet again he takes a concept, runs with it and extrapolates the consequences. Interesting role of females in the book.