Synonyms: Coccoidea scutula, Dothidea scutula, Dothidella scutula, Eumycrocyclus scutula, Microcyclus scutula, Phyllachora scutula, Polystomella scutula.
Coccoidella scutula is a species of fungus in the family Rhytismataceae, order Rhytismatales, class Leotiomycetes, phylum Ascomycota. It is a foliicolous fungus that grows on leaves, particularly on those of oak trees (Quercus spp.). In East and Central Texas, Coccoidella scutula has been found on various Quercus species, including Q. buckleyi, Q. stellata, and Q. velutina. The fungus produces small, circular to elliptical apothecia that are initially immersed in the leaf tissue and later become erumpent, with a yellowish to brownish disc and a raised, crenate margin. Ascospores are hyaline, fusoid to clavate, and measure 40-60 x 5-7 μm. The fungus is typically found in shaded, humid environments, such as woodland edges and stream banks, where oak trees are common.
Round black spots (ascostromata) on upper surface of leaves of redbay tree (Persea borbonia) of Ascomycete fungus Coccoidella scutula at the border of Martin Flat meadow in Little Thicket Nature Sanctuary. Cleveland, Texas, March 25, 2023
San Jacinto County, Texas, United States
Close-up of ascostromata on upper surface of leaves of redbay (Persea borbonia) caused by Ascomycete fungus Coccoidella scutula in area of Martin Flat meadow in Little Thicket Nature Sanctuary. Cleveland, Texas, March 25, 2023San Jacinto County, Texas, United States
Asci with spores (with x40 objective) of black Ascomycete fungus Coccoidella scutula from upper surface of leaves of redbay tree (Persea borbonia) collected a day before in Little Thicket Nature Sanctuary. Texas, March 26, 2023
Asci with spores (with x100 objective) of black Ascomycete fungus Coccoidella scutula from upper surface of leaves of redbay (Persea borbonia) collected a day before in Little Thicket Nature Sanctuary. Texas, March 26, 2023
Discoid black spots (ascostromata) of parasitic Ascomycete fungus Coccoidella scutula and white grainy substance from Protomyces(?) fungus through a binocular microscope on upper surface of leaves of redbay (Persea borbonia) collected a day before in Little Thicket Nature Sanctuary. Texas, March 26, 2023
White grainy substance from Protomyces(?) fungus near parasitic Ascomycete fungus Coccoidella scutula from upper surface of leaves of redbay tree (Persea borbonia) under a microscope with x40 objective, collected a day before in Little Thicket Nature Sanctuary. Texas, March 26, 2023
White grainy substance from Protomyces(?) fungus near parasitic Ascomycete fungus Coccoidella scutula from upper surface of leaves of red bay (Persea borbonia) under a microscope with x100 objective, collected a day before in Little Thicket Nature Sanctuary. Texas, March 26, 2023
Various spores of fungi in white grainy substance from Protomyces(?) fungus near ascostromata of fungus Coccoidella scutula from upper surface of leaves of red bay (Persea borbonia) collected a day before in Little Thicket Nature Sanctuary. Texas, March 26, 2023
Various cells and spores of fungi near parasitic Ascomycete fungus Coccoidella scutula in white grainy substance from Protomyces(?) fungus from upper surface of leaves of red bay (Persea borbonia) collected a day before in Little Thicket Nature Sanctuary. Texas, March 26, 2023
Pattern of various cells and spores of fungi growing together with parasitic Ascomycete fungus Coccoidella scutula in white grainy substance from Protomyces(?) fungus from upper surface of leaves of red bay (Persea borbonia) collected a day before in Little Thicket Nature Sanctuary. Texas, March 26, 2023
Details of various cells and spores around parasitic Ascomycete fungus Coccoidella scutula in white grainy substance from Protomyces(?) fungus from upper surface of leaves of red bay (Persea borbonia) collected a day before in Little Thicket Nature Sanctuary. Texas, March 26, 2023
Mycelium and spores of fungi around parasitic Ascomycete fungus Coccoidella scutula in white grainy substance from Protomyces(?) fungus from upper surface of leaves of red bay (Persea borbonia) collected a day before in Little Thicket Nature Sanctuary. Texas, March 26, 2023
Yellow spores and mycelium (in KOH) of fungi around parasitic Ascomycete fungus Coccoidella scutula in white grainy substance from Protomyces(?) fungus from upper surface of leaves of red bay (Persea borbonia) collected a day before in Little Thicket Nature Sanctuary. Texas, March 26, 2023On the upper surface of redbay tree leaves in East and Central Texas, specifically at Martin Flat meadow in Little Thicket Nature Sanctuary, observations revealed round black spots (ascostromata) caused by the Ascomycete fungus Coccoidella scutula. Under microscopic examination with x40 and x100 objectives, asci with spores were visible. Additionally, a white grainy substance from Protomyces(?) fungus was observed near the ascostromata of Coccoidella scutula, containing various spores and cells of fungi. The pattern of growth showed various cells and spores growing together with Coccoidella scutula in the white grainy substance. Further examination revealed mycelium and spores around the parasitic fungus, including yellow spores and mycelium when treated with KOH. These observations provide insight into the morphology and growth patterns of Coccoidella scutula on redbay tree leaves in this region.
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