(This was sent to me from Doug Greene from the LICHEN CLASS group.

I am forwarding it to Chicago members.

To all who are interested. Clifford Wetmore has placed the
Keys to the Minnesota Lichens in a dowloadable PDF format.
http://www.tc.umn.edu/~wetmore/Herbarium/HERBHOME.htm

It's the latest updated version 2005.

These keys should be good for most of the North Central and even
Northeastern USA and the adjacent parts of Southern Canada.

Doug Greene