Lichen — Chemical spot tests

References

• https://britishlichensociety.org.uk/learning/chemical-tests
• https://en.wikipedia.org/wiki/Spot_test_(lichen)
• https://www.inaturalist.nz/posts/123367-practical-introduction-to-chemical-tests-of-lichens
• Photos at https://www.sharnoffphotos.com/lichensNH/lichen_tests.html
• https://northwest-lichenologists.wildapricot.org/Tools-and-chemicals
• http://blogs.evergreen.edu/lichens/studying-lichens/
• https://pressbooks.openeducationalberta.ca/albertalichens/chapter/chemistry/