Spot test (lichen)
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A spot test in lichenology is a spot analysis used to help identify lichens. It is performed by placing a drop of a chemical reagent on different parts of the lichen and noting the colour change assoc
Spot tests on the foliose lichen Punctelia borreri showing thallus (top) and medulla (bottom). The pinkish-red colour change of the medulla in the C and KC tests indicate the presence of gyrophoric acid, a chemical feature that helps to distinguish it from similar species in the same genus.
Chemical spot tests on the crustose and saxicolous lichen Aspicilia epiglypta
UV-illuminated thallus and apothecia of the crustose lichen Ochrolechia africana; the yellowish colour results from the fluorescence of lichexanthone.
Punctelia subrudecta
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Punctelia subrudecta is a species of foliose lichen in the family Parmeliaceae. Originally described in 1886 as Parmelia subrudecta, it was transferred to the genus Punctelia in 1982. For much of the
Spot test (lichen)
…with it (including skin) will discolour. Some common and widely distributed lichens that have lichen products with a positive reaction to P include Parmelia subrudecta, which is PD+ (yellow) because of the didepside atranorin, and Hypogymnia physodes, which is PD+ (orange) because of the depsidone physodalic acid…
Punctelia subrudecta
Spot tests
In the Netherlands