An interesting finding of a new for Eurasia North American lichen species Placidium californicum (Verrucariaceae)
Abstract
The description and location of the new to Eurasia lichen species Placidium californicum Breuss, found in the steppe ecotope in “Orenburgskii” Nature State Reserve (Orenburg Region, Russia) are reported. The species is very much similar to P. squamulosum (Ach.) Breuss, differing from it in subglobose spores with thickened walls, thinner rhizohyphae, 3.5–4.5 μm thick (in P. squamulosum 4.5–6.5 μm thick), and the absent or not clearly developed lower cortex. Based on all the currently known locations, a map of distribution of P. californicum has been compiled. The chorology issues and the ecological features are discussed. The lichen is found in arid and subarid areas of the temperate zone; it inhabits mainly in grassy and shrubby phytocenoses (steppes, prairies, deserts) on mineral (sandy and clay-sandy) substrates enriched with various salts, including carbonate, gypsum-containing and slightly saline soils.
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References
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