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Ophiostoma species (Ophiostomatales, Ascomycota), including two new taxa on eucalypts in Australia
Nkuekam, Gilbert Kamgan; De Beer, Z. Wilhelm; Wingfield, Michael J.; Mohammed, Caroline; Carnegie, Angus J.; Pegg, Geoffrey S.; Roux, Jolanda
The genus Ophiostoma accommodates ascomycetes in the order Ophiostomatales, some of which are important pathogens of trees. Although these fungi are well known in the northern hemisphere, very little is known regarding their occurrence or importance in Australia. The aim of the present study was to collect Ophiostoma spp. infecting wounds on Eucalyptus spp. in Australia, where most of these trees are native. Collections were made in three states of Australia and the isolates were identified using morphological and multigene-sequence comparisons. Of the 76 isolates collected, two previously unknown species of Ophiostoma were found and these are described here as O. tasmaniense sp. nov. and O. undulatum sp. nov. In addition, O. quercus (Georgev.) Nannf. and O. tsotsi Grobbelaar, Z.W.de Beer & M.J.Wingf. are reported for the first time from eucalypts in Australia and the distribution of Pesotum australiae Kamgan Nkuekam, Jacobs & Wingfield is expanded to include eucalypts in Tasmania. In pathogenicity tests, very small lesions were observed in both the bark and xylem of E. grandis (Hill) Maiden trees, suggesting that none of the collected species is a pathogen of Eucalyptus spp.
Nkuekam, Gilbert Kamgan; Solheim, Halvor; De Beer, Z. Wilhelm; Grobbelaar, J.W. (Johanna Wilhelmina); Jacobs, Karin; Wingfield, Michael J.; Roux, Jolanda(Associations des Amis des Cryptogames, Elsevier, 2010-09)
Ophiostoma spp. include important pathogens of trees and causal agents of sapstain. These fungi infect wounds on trees and are typically carried by insects, especially bark beetles. Ophiostoma spp. on coniferous hosts in ...
Linnakoski, Riikka; De Beer, Z. Wilhelm; Rousi, M.; Solheim, Halvor; Wingfield, Michael J.(Nationaal Herbarium Nederland & Centraalbureau voor Schimmelcultures, 2009)
Ophiostomatoid fungi were isolated from Scolytus ratzeburgi infesting Betula pendula and B. pubescens in Norway. Fungi were identified based on morphology, DNA sequence comparison for two gene regions and phylogenetic ...
Wilken, Pieter Markus; Steenkamp, Emma Theodora; Hall, Tracy A.; De Beer, Z. Wilhelm; Wingfield, Michael J.; Wingfield, Brenda D.(Elsevier, 2012)
In heterothallic Ascomycota, two opposite but distinct mating types control all sexual processes. Using mating crosses, mating types were assigned to ten isolates of the heterothallic fungal species Ophiostoma quercus. ...