1. Survey of LICHEN DETERMINATION KEYS
available on INTERNET; regularly updated.
CATALOG OF LICHENS IN ROMANIA by Dr. Maria Ciurchea; posted February 2004.
3. UNDER CONSTRUCTION: provisional determination keys for the
GRAPHIDALES OF COSTA RICA by H. Sipman; last update 21 July 2005.
4. Key to the lichen genera of Iran
by H. Sipman; last update 19 September 2006.
5. Pictures of AEGEAN LICHENS
; last update 3 January 2007.
6. Pictures of
; last update 2 June 2007.
7. Macrolichen keys and Checklist for NEW GUINEA LICHENS, by A. Aptroot; last
update 1 Febr. 2010. (pdf-file for downloading)
8. Provisional identification keys for LICHENS FROM REUNION; last
update 24 May 2011.
9. Provisional identification key for the lichen genus CLADONIA IN S.E. BRAZIL; last
update 24 May 2013.
10. Pictures of PORTO SANTO LICHENS
; last update 14 August 2019.