Synonyms: Irenopsis martiniana, Meliola martiniana.
Setameliola martiniana is a species of fungus in the family Meliolaceae, characterized by its dark, elongated conidiomata and setose conidia. In East and Central Texas, it has been found on various host plants, including trees and shrubs in the families Anacardiaceae, Fagaceae, and Sapindaceae. The fungus is typically associated with leaves, where it forms black, effused colonies with setae arising from the conidiomata. Collections have been made in several counties, including Bastrop, Brazos, and Houston, often in wooded areas or along streams.
Leaves of redbay tree (Persea borbonia) with black mildew caused by fungus Meliola martiniana (Setameliola martiniana), collected 2 days before on the edge of Martin Flat in Little Thicket Nature Sanctuary near Cleveland. Texas, February 26, 2024
Yellow leaf of redbay tree (Persea borbonia) with black, radiate, and velvety colonies of fungus Meliola martiniana (Setameliola martiniana) on its upper surface, collected 2 days before on the edge of Martin Flat in Little Thicket Nature Sanctuary near Cleveland. Texas, February 26, 2024
Asci and ascospores (at low magnification) of Trichothyrium sp., a catathecioid hyperparasite of Meliolales, and hyphal cells and irregularly shaped hyphopodia of fungus Meliola martiniana (Setameliola martiniana) from a leaf of redbay tree (Persea borbonia), collected 2 days before in Little Thicket Nature Sanctuary near Cleveland. Texas, February 26, 2024
Asci and ascospores of fungus Meliola martiniana (Setameliola martiniana) together with Trichothyrium sp., a catathecioid hyperparasite of Meliolales, from a leaf of redbay tree (Persea borbonia), collected 2 days before in Little Thicket Nature Sanctuary near Cleveland. Texas, February 26, 2024
Hyphal branching and capitate hyphopodia (at low magnification) of fungus Meliola martiniana (Setameliola martiniana) from a leaf of redbay tree (Persea borbonia), collected 2 days before in Little Thicket Nature Sanctuary near Cleveland. Texas, February 26, 2024
Sinuous nature of hyphal cells and irregularly shaped hyphopodia of fungus Meliola martiniana (Setameliola martiniana) from a leaf of redbay tree (Persea borbonia), collected 2 days before in Little Thicket Nature Sanctuary near Cleveland. Texas, February 26, 2024In East and Central Texas, specifically in Little Thicket Nature Sanctuary near Cleveland, observations were made on the fungus Setameliola martiniana (previously known as Meliola martiniana) infecting redbay trees (Persea borbonia). The fungus formed black, radiate, and velvety colonies on the upper surface of leaves. Under low magnification, hyphal cells and irregularly shaped hyphopodia were observed, as well as sinuous hyphal branching and capitate hyphopodia. Additionally, the presence of a catathecioid hyperparasite, Trichothyrium sp., was noted, which infects Meliolales, including Setameliola martiniana. Asci and ascospores of both Setameliola martiniana and Trichothyrium sp. were observed, providing insight into the fungal interactions on redbay trees in this region. These observations highlight the complex relationships between fungi and their hosts in Texas ecosystems.
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