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Helsinki, Finland

Hallenberg N.,Gothenburg University | Yurchenko E.,Vf Kuprevich Institute Of Experimental | Ghobad-Nejhad M.,Botanical Museum
Mycotaxon | Year: 2010

Peniophora laeta is easily recognized because it is restricted to Carpinas as host in Europe, and the reddish yellow basidioma is provided with prominent teeth or hyphal pegs, disrupting the bark when developing. P. pseudonuda was earlier not even thought of as related to P. laeta, because basidiomata are smooth and developing on the bark. Moreover, basidioma initiation starts with a thin layer of brown-pigmented hyphae on the bark surface. This gives a bluish tint to the mature basidioma, which is in striking contrast to the orange-yellow basidiomata found in P. laeta. Nevertheless, both ITS sequences and crossing tests show that P. pseudonuda is conspecific with P. laeta. This was supported also by similarities in spores, basidia, and cystidia morphology. Source

Somlyay L.,Hungarian Natural History Museum | Sennikov A.N.,Botanical Museum | Sennikov A.N.,RAS Komarov Botanical Institute
Phytotaxa | Year: 2016

The name Sorbus dacica Borbás (1887: 404), which refers to a well-defined species endemic to Romania, is widely accepted (e.g. Jávorka 1924–1925, Nyárády 1939, Kárpáti 1940, 1960, Buia 1956, Warburg & Kárpáti 1968, Dihoru & Pârvu 1987, Ciocârlan 2009, Dihoru & Negrean 2009, Kurtto 2009, Sârbu et al. 2013). This species is supposed to be of hybrid origin between some taxa of S. subgen. Aria Persoon (1806: 38) and S. aucuparia Linnaeus (1753: 477) of S. subgen. Sorbus; such hybrids and stabilized hybridogenous species are currently classified in S. subgen. Soraria Májovský & Bernátová (2001: 21). © 2016 Magnolia Press. Source

Frooberg L.,Botanical Museum | Stoll P.,University of Basel | Baur A.,University of Basel | Baur B.,University of Basel
Ecosphere | Year: 2011

Herbivores are known to decrease plant species diversity in ecosystems with low productivity. Limestone pavements are low-productive habitats harboring specialized communities of cyanobacteria, and endo- and epilithic lichens exposed to extreme temperature and humidity fluctuations. Pavements of the Great Alvar (Ö land, Sweden) are covered by free-living cyanobacteria giving the rock surface a dark color. Based on cyanobacterial abundance along the edges, two types of cracks intersecting the pavements have been described: Type one with abundant cyanobacteria and type two without cyanobacteria resulting in light-colored edges. Erosion and different lengths of inundation by melt water have been suggested to cause the conspicuous differences in community composition and hence color between cracks. We hypothesized that this pattern results from the grazing activity of the cyanobacteria- and lichen-feeding snail Chondrina clienta, which reduces cyanobacterial cover along light-colored cracks and facilitates endolithic lichens. Three dark and three light-colored cracks were investigated at each of three localities. Crack characteristics (i.e., aspect, width, depth and erosion) and snail density were assessed at the crack level. Cyanobacterial cover and lichen diversity were recorded in 1-cm sections, sampled every 5 cm along eight 160-cm-long transects per crack. Model selection was applied to estimate effects of snail density and distance from crack edges on cyanobacterial abundance and lichen diversity. Crack characteristics explained no differences in cyanobacterial cover or lichen diversity. However, cyanobacterial cover decreased towards the edges of cracks with high snail densities. A transplant experiment supported the correlationalevidence. The abundant cyanobacterial cover on pieces of stone placed close to cracks with high snail densities was completely grazed within 19 months. By contrast, cyanobacteria recolonized initially completely grazed pieces of stone when fixed near cracks without snails. Abundance and diversity of endolithic lichens increased along cracks with high compared to low snail densities but decreased in epilithic lichens and lichens with cyanobacterial symbionts. However, the presence of the gastropod herbivore decreased overall lichen diversity. Comparing presence-absence matrices with null models revealed that species co-occurred less frequently than expected. Taken together, we provide evidence that herbivory indirectly released endolithic lichens from competition for light by reducing cyanobacterial cover. © 2011 Fröberg et al. Source

Ronikier A.,Polish Academy of Sciences | Borgen T.,Botanical Museum
Polish Botanical Journal | Year: 2010

Three species belonging to Hygrocybe sect. Coccineae subsect. Squamulosae are commented based on material collected in Poland. Hygrocybe calciphila is reported for the first time from Poland. Hygrocybe miniata is reported from several new localities in the Tatra Mts, and the identity of one Polish collection of Hygrocybe strangulata is discussed. Macro- and micromorphological characters of the examined collections are described and their taxonomical status is discussed. Source

Somlyay L.,Hungarian Natural History Museum | Sennikov A.N.,Botanical Museum | Sennikov A.N.,RAS Komarov Botanical Institute
Phytotaxa | Year: 2014

The taxonomic and nomenclatural history of Jávorka's Sorbus bakonyensis is surveyed and its correct authorship and bibliographic citation is provided. The identity of the original material of S. bakonyensis and the history of its interpretations are discussed. The name S. bakonyensis is applicable to an endemic of the eastern Bakony Mountains, restricted to the vicinity of the village of Márkó in Hungary. The illegitimate name S. majeri is a synonym of S. bakonyensis. A new name, S. udvardyana, is introduced here for the species occurring in the western Balaton region of Hungary, which was erroneously named "S. bakonyensis" in recent Hungarian literature. © 2014 Magnolia Press. Source

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