Abstract
<p>Usnea jørgenseniana Bystr. &amp; Leśniewska sp. nova, an epixilic species of bushy Usnea (Parmeliaceae) in Sweden, is similar to U. hirta var. minutissima (Mer.) Bystr., but the similarity to U. hirta is apparent. U. jørgenseniana is not a species from the foveatae Mot. section. The lack of soralia and a very small thallus (0.3–2.0 cm) makes it difficult to locate U. jørgenseniana in the section Comosae Mot. It colonizes exceptionally unfavorable climatic conditions, a coprophilous species. Collected by G. Ohrstedt in 1937. Dozens of specimens from one position.</p>
Highlights
Lichens are one of the main links in the chain of matter and energy in nature. They actively participate in the circulation of gaseous atmospheric water, and this process is correlated with diurnal changes in relative humidity and temperature
Maybe it grows in northeastern Poland together with Evernia prunastri var. farinosa Bystr. and Ramalina motykana Bystr., but habitats colonized by these species have been removed from the landscape [Bystrek [4]]
C e.g. Clerc [8,9,10,11,12], halonen and Puolasmaa [14], halonen et al [13], holmgren et al [15], James et al [16], Swinskow and Krog [19], Thell et al [20]] tend to create species aggregate; others, e.g. Asahina [1], Awasthi [3] have described numerous species based on the content of chemical substances and ratio stratus graphical coefficient (RS)
Summary
Lichens are one of the main links in the chain of matter and energy in nature. They actively participate in the circulation of gaseous atmospheric water, and this process is correlated with diurnal changes in relative humidity and temperature. One of the reasons is the small economic importance of lichens, especially in the production of material goods Sometimes they are removed from wood and old wooden fences as they are considered not aesthetic. In the forest areas of Eurasia there are several dozen bushy species of Usnea They colonize bark, living and withered branches of trees. Shrubby Usnea species colonizing young as well as withered branches of trees, live shortly. Their lifespan does not exceed 5 years. Specimens of the genus Usnea were collected mainly by amateur collectors and researchers of the regional lichen biota. During the preparation of the samples, scientists had discovered that the similarity to Usnea hirta was apparent After detailed research they discovered that it was a new species for science. Chemical test [2]: K (10% KOh solution), C (water solution Ca0Cl2), PD (1–2% ethanol solution PFDA)
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