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| Roets, F.; Oberlander, K.C.; Dreyer, L.L.. |
| The genus Oxalis in southern Africa contains more than 200 species, with the vast bulk of species in the Greater Cape Floristic Region (GCFR). Recent fieldwork has suggested that many await discovery. Here we investigate the identity of two apparently undescribed Oxalis species from Northern Cape, South Africa, using morphological comparisons with closely related taxa. We provide a preliminary phylogenetic placement using DNA sequence-based analyses of the Internal Transcribed Spacer (ITS) region. Both putative new species are distinguished from all known Oxalis species based on macro-morphological traits. Molecular data placed both within a clade consisting of the weedy O. pes-caprae and its close relatives. Oxalis hirsutibulba sp. nov. is characterised by... |
| Tipo: Article / Letter to the editor |
Palavras-chave: New species; Oxalidaceae; Oxalis; Phylogeny; Taxonomy. |
| Ano: 2014 |
URL: http://www.repository.naturalis.nl/record/525376 |
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| Dreyer, L.L.; Oberlander, K.C.; Roets, F.. |
| Southern African Oxalis taxonomy is complicated by tremendous morphological variation. The widely distributed Oxalis flava, for example, currently contains eight morphologically distinct forms. The remaining members of sect. Crassulae display morphological characters distinctive enough to retain specific status, despite resemblance to forms of the broadly defined O. flava. Recent collection of a taxon with strong morphological affinities to species in sect. Crassulae generated much interest. In this study we assess the placement of this new taxon to members of sect. Crassulae based on analyses of DNA sequence data of the Internal Transcribed Spacer (ITS) region and morphological comparisons. Results show that most members of sect. Crassulae are distantly... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Oxalidaceae; Oxalis fabaefolia; Oxalis flava; Phylogeny; Taxonomy. |
| Ano: 2010 |
URL: http://www.repository.naturalis.nl/record/526083 |
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| Crous, P.W.; Summerell, B.A.; Shivas, R.G.; Burgess, T.I.; Decock, C.A.; Dreyer, L.L.; Granke, L.L.; Guest, D.I.; Hardy, G.E.St.J.; Hausbeck, M.K.; Hüberli, D.; Jung, T.; Koukol, O.; Lennox, C.L.; Liew, E.C.Y.; Lombard, L.; McTaggart, A.R.; Pryke, J.S.; Roets, F.; Saude, C.; Shuttleworth, L.A.; Stukely, M.J.C.; Vánky, K.; Webster, B.J.; Windstam, S.T.; Groenewald, J.Z.. |
| Novel species of microfungi described in the present study include the following from Australia: Phytophthora amnicola from still water, Gnomoniopsis smithogilvyi from Castanea sp., Pseudoplagiostoma corymbiae from Corymbia sp., Diaporthe eucalyptorum from Eucalyptus sp., Sporisorium andrewmitchellii from Enneapogon aff. lindleyanus, Myrmecridium banksiae from Banksia, and Pilidiella wangiensis from Eucalyptus sp. Several species are also described from South Africa, namely: Gondwanamyces wingfieldii from Protea caffra, Montagnula aloes from Aloe sp., Diaporthe canthii from Canthium inerne, Phyllosticta ericarum from Erica gracilis, Coleophoma proteae from Protea caffra, Toxicocladosporium strelitziae from Strelitzia reginae, and Devriesia agapanthi from... |
| Tipo: Article / Letter to the editor |
Palavras-chave: ITS DNA barcodes; LSU; Novel fungal species; Systematics. |
| Ano: 2012 |
URL: http://www.repository.naturalis.nl/record/532141 |
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| Roets, F.; Dreyer, L.L.; Wingfield, M.J.; Begerow, D.. |
| The smut genus Thecaphora contains plant parasitic microfungi that typically infect very specific plant organs. In this study, we describe a new species of Thecaphora from Oxalis lanata var. rosea (Oxalidaceae) in the Cape Floristic Region of South Africa. Molecular phylogenetic reconstructions based on large subunit ribosomal DNA sequence data confirmed the generic placement of the fungus and confirmed that it represents an undescribed species for which the name T. capensis sp. nov. is provided. The closest known sister species of the new taxon is T. oxalidis that infects the fruits of Oxalis spp. in Europe, Asia and the Americas. In contrast, T. capensis produces teliospores within the anthers of its host. This is the first documented case of an... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Anther-smut; Cape Floristic Region; Oxalis; Phylogeny; Thecaphora. |
| Ano: 2008 |
URL: http://www.repository.naturalis.nl/record/532261 |
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| Roets, F.; Oberlander, K.C.; Dreyer, L.L.. |
| South Africa has a rich, but scantily surveyed, desert flora. Documenting annual and geophytic species in this biome is challenging, as they usually only flower after adequate precipitation, which is characteristically erratic and infrequent. Recent floristic surveys in the Ai-Ais / Richtersveld Transfrontier Park were conducted after abnormally high precipitation and revealed the presence of numerous potentially new plant taxa, including two new members of the genus Oxalis. These taxa are clearly morphologically distinct from any known species. Here we explore the relationships of these species to other southern African species based on analyses of Internal Transcribed Spacer (ITS) and trnS-trnG DNA sequence data. Molecular data and morphological... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Oxalidaceae; Oxalis petricola; O. rubricallosa; Phylogeny; Taxonomy. |
| Ano: 2012 |
URL: http://www.repository.naturalis.nl/record/525837 |
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| Roets, F.; Wingfield, B.D.; Beer, Z.W. de; Wingfield, M.J.; Dreyer, L.L.. |
| The genus Ophiostoma (Ophiostomatales) has a global distribution and species are best known for their association with bark beetles (Curculionidae: Scolytinae) on conifers. An unusual assemblage of these fungi is closely associated with the African endemic plant genus Protea (Proteaceae). Protea-associated Ophiostoma species are ecologically atypical as they colonise the fruiting structures of various serotinous Protea species. Seven species have been described from this niche in South Africa. It has been speculated that novel species may be present in other African countries where these host plants also occur. This view was corroborated by recent collections of two unknown species from Protea caffra trees in Zambia. In the present study we evaluate the... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Β-tubulin; ITS; Ophiostoma; Phylogeny; Protea; Taxonomy. |
| Ano: 2010 |
URL: http://www.repository.naturalis.nl/record/532360 |
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