(Michael Guiry, Professor Emeritus of Botany at the National University of Ireland, to Alan Griffiths, pers. email, 22 July 2013) Lycopodium is not an alga […]it is a club-moss (http://en.wikipedia.org/wiki/Lycopodium). I think that the species that is meant is Lycopodium clavatum (http://en.wikipedia.org/wiki/Lycopodium_clavatum).