Fungalpedia – Note 485, Macgarvieomyces
Macgarvieomyces Klaubauf, Lebrun & Crous.
Citation when using this data: Tibpromma et al. 2024 (in prep.) – Fungalpedia, Fungal pathogens.
Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig. 1
Classification: Pyriculariaceae, Magnaporthales, Sordariomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Fungi.
Macgarvieomyces was named after the famous Scottish plant pathologist, Quentin D. MacGarvie (Klaubauf et al. 2014). The pathogenic genus Macgarvieomyces exhibits several distinguishing characteristics, including brown ellipsoidal chlamydospores arranged in chains. Conidiophores often exhibit medium brown coloration and are observed as individual structures. They possess a non-branching morphology, appearing as straight or slightly curved entities in the presence of the septa. Conidiogenous cells are typically located in the terminal position, but may occasionally be found in an intercalary position (Klaubauf et al. 2014). These cells have a medium brown coloration and commonly arrange themselves in a rachis structure. Additionally, conidiogenous cells frequently displayed flat-tipped denticles protruding from the surface. One notable morphological distinction is the presence of darker, larger, and more flexuous conidiophores accompanied by pale brown conidia that exhibit dark brown septations. The conidia are generally solitary in position, barely obclavate, and often granular to guttulate in appearance with one septation. The hilum often appears to be thickened and neither refractive nor darkened (Klaubauf et al. 2014). A total of three species of the genus have been reported, viz., Macgarvieomyces borealis, M. juncicola, and M. luzulae, the type species being M. borealis (Klaubauf et al. 2014, Marin-Felix et al. 2018). Species such as Macgarvieomyces luzulae are known to occur on the leaves of Luzula (Juncaceae), whereas M. juncicola and M. borealis occur on the stem bases and leaf spots of Juncus, respectively (Klaubauf et al. 2014). Both Macgarvieomyces juncicola and M. borealis occur on the same host, but they could be differentiated microscopically because M. juncicola generally bears longer but thinner conidia when compared to M. borealis (Klaubauf et al. 2014).
Type species: Macgarvieomyces borealis (de Hoog & Oorschot) Klaubauf, Lebrun & Crous
Other accepted species: Species Fungorum – search Macgarvieomyces
Figure 1 – Macgarvieomyces juncicola (CBS 610.82). a, b Conidiophores and conidia. c Conidia. Scale bars: a-c = 10 μm. Redrawn from Klaubauf et al. (2014).
References
Entry by
Dutta AK and Chattopadhyay P, Molecular & Applied Mycology Laboratory, Department of Botany, Gauhati University, Gopinath Bordoloi Nagar, Jalukbari, Guwahati, Assam 781014, India.
(Edited by Saowaluck Tibpromma, Samaneh Chaharmiri-Dokhaharani, & Achala R. Rathnayaka)
Published online 3 December 2024