Chemical spot tests with standard reagents (K, C, P)  and UV reactions are commonly used and extremely helpful in lichen identification. Beginners, however, often have difficulties interpreting their observations, simply because they have not seen an example of the reaction. The purposes of this poster are first, to display the appearance of the most commonly encountered spot test reactions and second, to show how the spot tests are used to infer the presence of the most commonly encountered secondary lichen substances.

17 x 22 inch (43 x 56 cm) poster on heavy white paper, folded in quarters to 8.5 x 11 inches.

Mailed flat and folded.

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