Its funny you brought it up as I was speaking to an American on Thursday and he kept referring to them as 'Mayflies' I did explain the difference but it was lost even though he could identify the fact that Olive Upright, LDO and BWO were all different mayflies , Nice guy though
I've always heard the old Don fishers refer to them all as mayflies, equally my Grandad a Wearside fisher always referred to them all as Mayflies, It confused me when my addiction started as the books only ever listed the one 'Mayfly'. I guess its a bit like Hoover syndrome, for the uninitiated all similar bugs get branded with the most famous one.
Incidently the Don fishers also refer to the Yellow May duns as Yellow Sally's, this used to confuse me as well until I figured out what they were talking about
Sandy