Helmut Mayrhofer

Helmut Mayrhofer
Karl-Franzens-Universität Graz | KFU Graz · Institute of Biology - Division of Plant Sciences

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240
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3,188
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Publications

Publications (240)
Article
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Lichen symbioses are thought to be stabilized by the transfer of fixed carbon from a photosynthesizing symbiont to a fungus. In other fungal symbioses, carbohydrate subsidies correlate with reductions in plant cell wall-degrading enzymes, but whether this is true of lichen fungal symbionts (LFSs) is unknown. Here, we predict genes encoding carbohyd...
Article
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A checklist of all taxa of lichenized and lichenicolous fungi recorded from Bulgaria is presented. The lichen biota as currently known includes 1137 taxa (1115 species, 5 subspecies, and 17 varieties) of lichenized fungi, 46 species of lichenicolous fungi, and 28 non-lichenized fungi traditionally included in lichenological literature. Lepra corall...
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In this contribution, new data concerning bryophytes, fungi and lichens of the Italian flora are presented. It includes new records and confirmations for the bryophyte genera Bryum , Cryphaea , Didymodon , and Grimmia ; the fungal genera Bryostigma , Cercidospora , Conocybe , Cortinarius , Endococcus , Inocybe , Psathyrella , and Sphaerellothecium...
Article
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Biodiversity is a key criterion in nature protection and often indicates habitats and localities rich in endangered species. Our research, using 48 one-man one-day field trips, located an exceptional lichen diversity hotspot and refugium for rare species, the Týřov National Nature Reserve (Czech Republic, central Bohemia). Within its 410 hectares,...
Article
In Graz (Austria) and Podgorica (Montenegro), epiphytic lichens and bryophytes were studied in 2017 based on a standardized approach. On 165 trees in Graz, 27 bryophyte and 38 lichen species were determined. In Podgorica, on 161 trees, 29 bryophyte and 52 lichen species were found. The mean epiphytic cover in Graz was significantly higher. Mean bry...
Article
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Aims : We studied the syntaxonomic position, biodiversity, ecological features, nature conservation value and current status of dry grasslands investigated by Josias Braun-Blanquet more than 60 years ago. Study area : Inner-alpine valleys of Austria. Methods : We sampled 67 plots of 10 m ² , following the standardized EDGG methodology. We subjected...
Article
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Based on the analysis of both historical and recent collections, this paper reports an annotated list of taxa which are new to the lichen biota of Italy or of its administrative regions. Specimens were identified using a dissecting and a compound microscope; routine chemical spot tests and standardized thin-layer chromatography (TLC or HPTLC). The...
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Aims Understanding fine-grain diversity patterns across large spatial extents is fundamental for macroecological research and biodiversity conservation. Using the GrassPlot database, we provide benchmarks of fine-grain richness values of Palaearctic open habitats for vascular plants, bryophytes, lichens and complete vegetation (i.e., the sum of the...
Preprint
Full-text available
Lichen symbioses are generally thought to be stabilized by the transfer of fixed carbon compounds from a photosynthesizing unicellular symbiont to a fungus. In other fungal symbioses, carbohydrate subsidies correlate with genomic reductions in the number of genes for plant cell wall-degrading enzymes (PCWDEs), but whether this is the case with lich...
Article
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Amandinea montanensis Elix & H.Mayrhofer and Buellia tropica Elix & H.Mayrhofer are described as new to science. The new combination Amandinea manamiana (Diederich) Elix & H.Mayrhofer, is made. It and Buellia macularis Zahlbr., Gassicurtia elizae (Tuck.) Marbach and G.rufofuscescens (Vain.) Marbach are reported for the first time from Australia. A...
Article
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Buellia magaliesbergensis Elix & H.Mayrhofer and B. subeffigurata Elix, H.Mayrhofer & Wetschnig, from South Africa, are described as new to science.
Article
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The botanical exploration of the Majella National Park has a long tradition dating back to the eighteenth century. However, the lichen biota of this area is still poorly investigated. To provide a baseline for future investigations, in this annotated checklist, we summarised all available information on the occurrence of lichens in the Majella Nati...
Article
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Selected locations in four Balkan countries (Serbia, Albania, North Macedonia and Greece) were visited. One hundred and twenty one lichen species were recorded in fourteen locations. Cladonia cervicornis is reported new to Serbia, as well as Cladonia squamosa, Pertusaria leioplaca, Xanthoparmelia angustiphylla and Polycau-liona polycarpa to Albania...
Article
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Three new species of buellioid lichens (Caliciaceae, Ascomycota) from New Zealand and the first report of Rinodinella dubyanoides (Physciaceae, Ascomycota) from Australia and New Zealand
Article
Widespread geographic distributions in lichens have been usually explained by the high dispersal capacity of their tiny diaspores. However, recent phylogenetic surveys have challenged this assumption and provided compelling evidence for cryptic speciation and more restricted distribution ranges in diverse lineages of lichen-forming fungi. To evalua...
Article
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The Polylepis australis forests in Central Argentina support a great biodiversity in a relative small area. As a result of this study focusing on the diversity and ecology of the lichen communities of these forests, we present five new species for South America: Rinodina ficta, R. malcolmii, R. obscura, Usnea glabrata, Tetramelas triphragmioides an...
Article
A total of 42 taxa of lichenicolous fungi – most of them non-lichenized, a few lichenized – are recorded from various countries in southeastern Europe. Of these, 22 species (Clypeococcum cetrariae, Didymocyrtis pseudeverniae, Illosporiopsis christiansenii, Lecanora lecanoricola, Lecanora printzenii, Lichenoconium erodens, Lichenoconium reichlingii,...
Article
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Assessing the ecological impacts of environmental change on biological communities requires knowledge of the factors driving the spatial patterns of the three diversity facets along extensive environmental gradients. We quantified the taxonomic (TD), functional (FD), and phylogenetic diversity (PD) of lichen epiphytic communities in 23 beech forest...
Article
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In dry habitats of European lowlands terricolous lichens and bryophytes are almost neglected in conservation practises, even if they may strongly contribute to biodiversity. This study aims at (a) testing the role of heathlands, acidic and calcareous dry grasslands for lichen and bryophyte diversity and conservation in lowland areas of northern Ita...
Conference Paper
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The Po Plain is the most heavily human-impacted area of Italy. Pollution levels are very high, and most of natural habitats have been destroyed or reduced to small fragments. This situation leads to a poor lichen biota. In particular, terricolous lichens are very sensitive to disturbance, and prone to local extinction, also due to their poor compet...
Article
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The 13 th EDGG Field Workshop was conducted from the 26 June to 6 July 2019 in Armenia. The Field Workshop had two main aims: (a) to analyse the biodiversity patterns of the Armenian grasslands across multiple taxonomic groups and grain sizes, and (b) to study the syntaxonomic position of these grasslands in a general European context. We conducted...
Article
The genus Cladonia (Cladoniaceae, Lecanorales, lichenized Ascomycota) has been surveyed in 44 sites in the province of Imperia in western Liguria. Of 36 taxa recorded, Cladonia dimorpha and C. pseudopityrea are new to northern Italy, and C. cryptochlorophaea, C. pleurota, C. polydactyla and C. rei are new to Liguria; interesting are also recordspro...
Article
Characterizing functional trait variation and covariation, and its drivers, is critical to understand the response of species to changing environmental conditions. Evolutionary and environmental factors determine how traits vary among and within species at multiple scales. However, disentangling their relative contribution is challenging and a comp...
Article
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The 11 th EDGG Field Workshop was conducted from 6 to 13 July 2018 in Austria. Its aim was to revisit dry grasslands in the inneralpine dry valleys of Austria that were investigated in the late 1950s by Braun-Blanquet and to collect high-quality biodiversity data from these. We conducted our sampling in the Styrian Mur Valley, the Virgen Valley in...
Article
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Amandinea mountmeensis, Buellia bularmialensis, B. dayboroana and B. neohalonia are described as new to science. In addition, Buellia haywardii is reported from Australia for the first time.
Article
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Cratiria jamesiana Elix & H.Mayrhofer, a saxicolous species with Physconia-then Buellia-type ascospores and bacilliform conidia, and containing thuringione and arthothelin, is described as new to science.
Article
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The corticolous Rinodina fineranii and Rinodina malcolmii, both characterized by the presence of Mischoblastia-type ascospores, are described as new to science. In addition, Rinodina australiensis is reported for the first time from New Zealand
Article
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GrassPlot is a collaborative vegetation-plot database organised by the Eurasian Dry Grassland Group (EDGG) and listed in the Global Index of Vegetation-Plot Databases (GIVD ID EU-00-003). Following a previous Long Database Report (Dengler et al. 2018, Phytocoenologia 48, 331–347), we provide here the first update on content and functionality of Gra...
Article
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The additions are based on an evaluation of 53 published sources concerning Bosnia and Herzegovina and on unpublished herbarium specimens. The actual lichen biota of the country includes 648 species (with 4 subspecies and 14 varieties) of lichenized, 13 non-lichenized or doubtfully lichenized, and 26 lichenicolous fungi.
Article
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In this contribution, new data concerning algae, bryophytes, fungi, and lichens of the Italian flora are presented. It includes new records and confirmations for the algae genus Chara , the bryophyte genera Homalia , Mannia , and Tortella , the fungal genera Cortinarius , Russula , and Stereum , and the lichen genera Cetrelia , Cladonia , Enterogra...
Article
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Wood is an important construction material, but when used incorrectly it can be subjected to deterioration by wood-destroying fungi. The brown rot producing dry rot fungus (Serpula lacrymans) is by far the most dangerous wood-destroying fungus in Europe. In the present publication, 645 fungal samples from damaged wood in the federal state of Styria...
Article
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In this contribution, new data concerning algae, bryophytes, fungi, and lichens of the Italian flora are presented. It includes new records and confirmations for the algae genus Chara , the bryophyte genera Cephalozia , Conardia , Conocephalum , Didymodon , Sphagnum , Tetraplodon , and Tortula , the fungal genera Endophyllum , Gymnosporangium , Mic...
Article
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Climate change and the anthropic emission of pollutants are likely to have an accelerated impact in high-elevation mountain areas. This phenomenon could have negative consequences on alpine habitats and for species of conservation in relative proximity to dense human populations. This premise implies that the crucial task is in the early detection...
Article
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A list of 256 taxa of lichens, four species of lichenicolous fungi and one non-lichenized fungus from Croatia is presented. The list is based on unpublished specimens kept in the lichen collections of the herbarium GZU (University of Graz, Austria) and on recent fieldwork in Učka Nature Park. The following 23 lichenized and 1 lichenicolous species...
Article
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In this contribution, new data concerning bryophytes, fungi, and lichens of the Italian flora are presented. It includes new records and confirmations for the bryophyte genera Barbula , Fissidens , Gymnostomum , Jungermannia , Riccia , and Scapania , the fungal genera Hyalopsora and Urocystis and the lichen genera Arthothelium , Chaenotheca , Lepra...
Article
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Eighteen species of lichenized and two species of lichenicolous fungi from oak stands of east-central Europe’s rural landscapes are presented. Rinodina isidioides is new to eastern Europe and the Carpathians, Abrothallus microspermus is new to the Carpathians, Rinodina excrescens is new to the eastern Carpathians, Biatora pontica is new to the Poli...
Article
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Amandinea puertomonttensis Elix, H.Mayrhofer & J.M.Rodr. and Tetramelas fuegiensis Elix, H.Mayrhofer & J.M.Rodr. are described as new to science, and the new combination Buellia pygmaea (Räsänen) Elix, H.Mayrhofer & J.M.Rodr. is proposed for B. protothallina var. pygmaea Räsänen. Amandinea fuscoatratula (Zahlbr.) Elix, A. subplicata (Nyl.) Øvstedal...
Article
Cladonia conista and C. pulvinata occur at several sites in dry lowland habitats in the Po Plain (northern Italy). Vegetation relevés are provided in order to characterize the main lichen associations (Cladonietum rei, Cladonietum foliaceae, Pycnothelio-Cladonietum cervicornis) and vascular plant communities in which the two species were found in T...
Article
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Muggia, L., Kati, V., Rohrer, A., Halley, J. & Mayrhofer, H. 2018. Species diversity of lichens in the sacred groves of Epirus (Greece). – Herzogia 31: 231–244. The sacred groves in the mountains of Epirus in NW Greece have been established during the Ottoman period and consist of locally adapted systems set apart from the surrounding intensively m...
Article
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Nomenclatural type definitions are one of the most important concepts in biological nomenclature. Being physical objects that can be re-studied by other researchers, types permanently link taxonomy (an artificial agreement to classify biological diversity) with nomenclature (an artificial agreement to name biological diversity). Two proposals to am...
Article
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This is the first attempt to provide an overview of the lichen diversity of the Alps, one of the biogegraphically most important and emblematic mountain systems worldwide. The checklist includes all lichenised species, plus a set of non- or doubtfully lichenised taxa frequently treated by lichenologists, excluding nonlichenised lichenicolous fungi....
Article
Full-text available
This is the first attempt to provide an overview of the lichen diversity of the Alps, one of the biogegraphically most important and emblematic mountain systems worldwide. The checklist includes all lichenised species, plus a set of non- or doubtfully lichenised taxa frequently treated by lichenologists, excluding non-lichenised lichenicolous fungi...
Article
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Morphological, chemical and species delimitation analyses provide new taxonomic insights into two groups of Rinodina – ERRATUM - Volume 50 Issue 2 - Philipp RESL, Helmut MAYRHOFER, Stephen R. CLAYDEN, Toby SPRIBILLE, Göran THOR, Tor TØNSBERG, John W. SHEARD
Article
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Following an initial study of vascular plant diversity in the area of the Aosta valley (Wiesner et al. 2015), one of the driest regions of the inneralpine valleys, the authors came up with the idea to start a systematic investigation of the grassland vegetation of the inneralpine dry valleys as a whole. This has been the subject of the seminal work...
Article
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A list of two hundred and twelve taxa of lichenized fungi, three species of lichenicolous fungi, and two non-lichenized fungi is presented. Thirtysix lichenized taxa (thirtytwo species, one subspecies and three varieties), the lichenicolous fungus Biatoropsis usnearum, and the non-lichenized fungus Microcalicium arenarium are new to Montenegro.
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Malíček, J. & Mayrhofer, H. 2017. Additions to the lichen diversity of Macedonia (FYROM). — Herzogia 30: 431–444. Selected localities in Galičica National Park, Matka canyon in the Suva Gora Mountains, Mavrovo National Park, Ohrid Basin, Vardar River valley and Popova Šapka in the Šar Planina Mountains were briefly studied during a field excursion...
Article
In this contribution, new data concerning bryophytes, fungi and lichens of the Italian flora are presented. It includes new records and confirmations for the bryophyte genera Campylopus, Paludella, Tortula, and Conocephalum, the fungal genera Agonimia, Buelliella, Entorrhiza, Filicupula, Poronia, and Sporisorium, the lichen genera Cladonia, Dibaeis...
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Aim: To assess the spatial-temporal dynamics of primary succession following deglaciation in soil-dwelling lichen communities. Location: European Alps (Austria, Switzerland and Italy). Methods: Five glacier forelands subjected to relevant glacier retreat during the last century were investigated. In each glacier foreland, three successional stages...
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Grube, M., Obermayer, W., Mayrhofer, H. & Spribille, T. 2016. Josef Hafellner – a life amongst lichens and their parasites. – Herzogia 29: 213 –234.
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The genus Rinodina (Physciaceae), with approximately 300 species, has been subject to few phylogenetic studies. Consequently taxonomic hypotheses in Rinodina are largely reliant on phenotypic data, while hypotheses incorporating DNA dependent methods remain to be tested. Here we investigate Rinodina degeliana/R. subparieta and the Rinodina mniaraea...