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Name: Jennifer Mae H.
Status: student
Age: 20s
Location: N/A
Country: N/A
Date: 3/4/2004


Question:
Do lichens change colors or is it just because their different species? If they do change colors what is this due to? I am interested in lichens on oak trees.


Replies:
These pages mention litmus as a lichen extract. Litmus paper is regularly used to determine pH based on color change.

http://www.princeton.edu/teacher/tsm/scienceaction/acids.htm

http://www.chriscooksey.demon.co.uk/lichen/litmus.htm

http://www.botanical.com/botanical/mgmh/l/litmus35.html

Also possibly helpful:

http://www.newton.dep.anl.gov/askasci/bot00/bot00337.htm

Anthony Brach, Ph.D



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