I ' m not American and don ' t really grasp all the nuances of the current political climate in the US , so could you explain as best you can this whole rapist thing that people are pushing upon Bill Clinton ? <| sep |> Lichens by William Purvis . I have obviously not read this , I just searched books on lichen on the obscure site called google . Your question made me curious about the topic . This is more an introductory book though , and it contains photographs too . One reviewer on Goodreads moaned that it is written for British audience only as North American lichens are not covered . Were you looking for the North American ones ? <| sep |> Isn ' t it Mark Kerr who used to do that ? I think he finished 2 guys with that technique .