Abstract
In northeastern Poland, the chemical variation of the <em>Cladonia chlorophaea-pyxidata</em> group was much neglected, as TLC has not been used in delimitation of species differing in the chemistry. As a great part of herbal material of University in Bialystok from NE Poland was misidentified, I found my studies to be necessary. Based on the collection of 123 specimens deposited in Herbarium of University in Bialystok, nine species of the <em>C. pyxidata-chlorophaea</em> group are reported from NE Poland. The morphology, secondary chemistry, and ecology of examined lichens are presented and the list of localities is provided. The results revealed that <em>C. fimbriata</em> is the most common species in the northeastern Poland, comprising around 33% of the studied specimens. <em>Cladonia conista</em>, <em>C. cryptochlorophaea</em>, and <em>C. merochlorophaea</em> are known only from very few locations. This study shed light on the role of the lichens substances to diagnosis of the species of <em>C. pyxidata-chlorophaea</em> group.
Highlights
Lichens of the Cladonia pyxidata-chlorophaea group are characterized by primary thallus squamulose and scyphose podetia
The importance of secondary lichen metabolites to the taxonomy and species discrimination within the C. pyxidata-chlorophaea group has been confirmed based upon simultaneous analyses of DNA sequences and morphological and chemical data by Stenroos et al [10]
In NE Poland, the chemical variation of the C. pyxidata-chlorophaea group was much neglected, as thin layer chromatography (TLC) has not been used in delimitation of species differing in the chemistry
Summary
Lichens of the Cladonia pyxidata-chlorophaea group are characterized by primary thallus squamulose and scyphose podetia. The podetia are covered with farinose to granular soredia, corticated granules, and/or more or less areolate cortex. Apothecia are brown and rare [1,2]. The species of this group have a diverse secondary chemistry. Fourteen chemotypes and 35 lichen secondary metabolites have been identified within the group from the world [3]. The species status of chemically different entities has been frequently questioned
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