Hi, In message <CAFsz2W_9iDLuH38t9qqLWXSez5HijTiSTG7=aH_7HW7ZrbBERw@mail.gmail.com>, Hannon <othonna@gmail.com> writes >They have been called "cohering keels" and an illustrated article about Thank you, very interesting. I've also seen them on Nerine. -- David Pilling email: david@pilling.demon.co.uk web: http://www.davidpilling.net/