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Registros recuperados: 6
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Foliicolous microfungi occurring on Encephalartos Naturalis
Crous, PW.; Wood, A.R.; Okada, G.; Groenewald, J.Z..
Species of Encephalartos, commonly known as bread trees, bread palms or cycads are native to Africa; the genus encompasses more than 60 species and represents an important component of the indigenous African, flora. Recently, a leaf blight disease was noted on several E. altensteinii plants growing at the foot of Table Mountain, in the Kirstenbosch Botanical Gardens of South Africa. Preliminary isolations from dead and dying leaves of E. altensteinii,, E. lebomboensis and E. princeps, collected from South Africa, revealed the presence of several novel, microfungi on this host. Novelties include Phaeomoniella capensis, Saccharata kirstenboschensis, Teratosphaeria, altensteinii and T. encephalarti. New host records of species previously only known to occur...
Tipo: Article / Letter to the editor Palavras-chave: Catenulostroma; Cladophialophora; Dactylaria; ITS nrDNA; LSU nrDNA; Ochroconis; Phaeomoniella; Saccharata; Systematics; Teratosphaeria.
Ano: 2008 URL: http://www.repository.naturalis.nl/record/531726
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Host specificity and speciation of Mycosphaerella and Teratosphaeria species associated with leaf spots of Proteaceae Naturalis
Crous, P.W.; Summerell, B.A.; Mostert, L.; Groenewald, J.Z..
Cheirosporium gen. nov. is characterised by the production of sporodochial conidiomata, semi-macronematous to macronematous onidiophores that possess several distinct sterile branches, and cheiroid, smooth-walled conidia with rhexolytic secession. The 28S rDNA and ITS rDNA operon of this taxon were amplified and sequenced. A BLAST search revealed low homology between Cheirosporium triseriale and existing sequences in public databases, supporting the hypothesis that the species is new to science. Phylogenetic analysis showed that C. triseriale groups with Dictyosporium and allied species, and nests within the Pleosporales (Dothideomycetes, Ascomycota).heirosporium is morphologically distinct from the cheirosporous genera Cheiromyces, Cheiromycina,...
Tipo: Article / Letter to the editor Palavras-chave: ITS; Leucadendron; Leucospermum; Mycosphaerella; Protea; Teratosphaeria.
Ano: 2008 URL: http://www.repository.naturalis.nl/record/532268
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Niche sharing reflects a poorly understood biodiversity phenomenon Naturalis
Crous, P.W.; Wingfield, M.J.; Groenewald, J.Z..
Eucalyptus spp. are susceptible to a large number of foliar pathogens, some of which can cause serious defoliation and die-back. In this study, a single leaf spot on a Eucalyptus leaf collected in Madagascar revealed an unusual association of microfungi with disease symptoms. Initial observations indicated that the leaf spot was associated with Mycosphaerella marksii, a common pathogen of eucalypts. However, more intensive scrutiny showed the presence of several other microfungi co-occurring in this, and other leaf spots on the leaf. A total of 41 single conidial propagules were subsequently obtained from a single lesion for morphological study and DNA sequence comparisons. Based on these data, 11 members of the Capnodiales, including one species of...
Tipo: Article / Letter to the editor Palavras-chave: Eucalyptus; ITS; Mycosphaerella; Systematics; Teratosphaeria.
Ano: 2009 URL: http://www.repository.naturalis.nl/record/531761
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Novel species of Mycosphaerellaceae and Teratosphaeriaceae Naturalis
Crous, P.W.; Summerell, B.A.; Carnegie, A.J.; Wingfield, M.J.; Groenewald, J.Z..
Recent phylogenetic studies based on multi-gene data have provided compelling evidence that the Mycosphaerellaceae and Teratosphaeriaceae represent numerous genera, many of which can be distinguished based on their anamorph morphology. The present study represents the second contribution in a series describing several novel species in different capnodealean genera defined in a previous study. Novelties on Eucalyptus from Australia include: Penidiella pseudotasmaniensis, P. tenuiramis, Phaeothecoidea intermedia, P. minutispora, Pseudocercospora tereticornis, Readeriella angustia, R. eucalyptigena, R. menaiensis, R. pseudocallista, R. tasmanica, Teratosphaeria alboconidia, T. complicata, T. majorizuluensis, T. miniata, T. profusa, Zasmidium aerohyalinosporum...
Tipo: Article / Letter to the editor Palavras-chave: Mycosphaerella; Penidiella; Phaeophleospora; Phaeothecoidea; Pseudocercospora; Readeriella; Teratosphaeria; Zasmidium.
Ano: 2009 URL: http://www.repository.naturalis.nl/record/532086
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Unravelling Mycosphaerella: do you believe in genera? Naturalis
Crous, P.W.; Summerell, B.A.; Carnegie, A.J.; Wingfield, M.J.; Hunter, G.C.; Burgess, T.I.; Andjic, V.; P.A. Barber; J.Z. Groenewald.
Many fungal genera have been defined based on single characters considered to be informative at the generic level. In addition, many unrelated taxa have been aggregated in genera because they shared apparently similar morphological characters arising from adaptation to similar niches and convergent evolution. This problem is aptly illustrated in Mycosphaerella. In its broadest definition, this genus of mainly leaf infecting fungi incorporates more than 30 form genera that share similar phenotypic characters mostly associated with structures produced on plant tissue or in culture. DNA sequence data derived from the LSU gene in the present study distinguish several clades and families in what has hitherto been considered to represent the Mycosphaerellaceae....
Tipo: Article / Letter to the editor Palavras-chave: Cibiessia; Colletogloeum; Dissoconium; Kirramyces; Mycosphaerella; Passalora; Penidiella; Phaeophleospora; Phaeothecoidea; Pseudocercospora; Ramularia; Readeriella; Stenella; Teratosphaeria; Zasmidium.
Ano: 2009 URL: http://www.repository.naturalis.nl/record/531971
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Why everlastings don’t last Naturalis
Crous, P.W.; Groenewald, J.Z..
The Cape Floral Region represents one of the world’s biodiversity hot spots, with a high level of plant, animal and insect endemism. The fungi occurring in this region, however, remain poorly studied. It is widely postulated that each plant species should harbour at least five to six unique fungal species, a number that we regard to be a huge underestimate. To test this hypothesis, we decided to study a single senescent flower of Phaenocoma prolifera (‘everlasting’; Asteraceae) collected in South Africa, and posed the question as to how many different species of fungi could be isolated and cultivated from 10 leaf bracts. Using a damp chamber technique, numerous microfungi could be induced to sporulate, enabling most of them to be successfully isolated on...
Tipo: Article / Letter to the editor Palavras-chave: Batcheloromyces; Catenulostroma; Cladosporium; Devriesia; Exophiala; ITS; LSU; Penicillium; Penidiella; Phaenocoma prolifera; Systematics; Teratosphaeria; Toxicocladosporium; Xenophacidiella.
Ano: 2011 URL: http://www.repository.naturalis.nl/record/531877
Registros recuperados: 6
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