A long time ago, and well before I created Crustose.Net, I started the Lichen Key Archive.  I still think it was a neat idea, and there was a bit of interest.  But there were a couple technical difficulties of the time that made it difficult to maintain.  While the base pages still exist at the link above, nothing has been added for years and the links to the keys themselves appear broken.

This section of Crustose.Net is available for reviving the idea.  Post keys if you like.  Comments on posted keys are welcome.