Synonyms: Cucurbitaria botryosa, Discosphaera rubiginosa, Euhypoxylon rubiginosum, Gibberidea botryosa, Hypoxylon botryosum, Hypoxylon botrys, Hypoxylon florideum, Hypoxylon stereoides, Sphaeria botryosa, Sphaeria granulosa, Sphaeria multiformis, Sphaeria rubiginosa, Stromatosphaeria rubiginosa.
Common name: rusty woodwart.
Hypoxylon rubiginosum is a species of fungus in the family Hypoxylaceae, characterized by its reddish-brown to brown stromata with perithecia that are partially immersed to superficial. In East and Central Texas, it typically grows on dead branches and trunks of deciduous trees, particularly oak and elm. The fungus produces ascospores that are dark brown, ellipsoid, and measure 11-15 μm in length. It is commonly found in wooded areas, including forests and woodlands, and can be abundant on fallen logs and stumps.
Yellow corticioid fungus (Hypoxylon rubiginosum(?), young stage) that looks like sprayed paint on underside of an oak log in a dried shallow creek on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest, near Huntsville. Texas, May 19, 2018
Close up of a yellow fungus (Hypoxylon rubiginosum(?), young stage) that looks like sprayed paint on underside of an oak log on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest, near Huntsville. Texas, May 19, 2018
Yellow corticioid fungus (Hypoxylon rubiginosum(?), young stage) that looks like sprayed paint on underside of an oak log on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest, near Huntsville. Texas, May 19, 2018
Yellow corticioid fungus (Hypoxylon rubiginosum(?), young stage) on underside of an oak log on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest, near Huntsville. Texas, May 19, 2018
Thin yellow corticioid fungus (Hypoxylon rubiginosum(?), young stage) on underside of a decorticated oak log on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest, near Huntsville. Texas, May 19, 2018
Thin yellow corticioid fungus (Hypoxylon rubiginosum(?), young stage) covering underside of a decorticated oak log on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest, near Huntsville. Texas, May 19, 2018
Yellow crust fungus Hypoxylon rubiginosum(?) on underside of a piece of wood on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest, near Huntsville. Texas, May 26, 2018
Spreading yellow and dark-brown fungus Hypoxylon rubiginosum(?) on underside of a piece of wood on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest, near Huntsville. Texas, June 9, 2018
Yellow and dark-brown crust fungus Hypoxylon rubiginosum(?) on underside of a piece of wood on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest, near Huntsville. Texas, June 9, 2018
Yellow and dark-brown Hypoxylon rubiginosum(?) corticioid fungus on underside of a piece of wood on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest, near Huntsville. Texas, June 9, 2018
Yellow and dark-brown Hypoxylon rubiginosum(?) crust fungus spreading on underside of a piece of wood on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest, near Huntsville. Texas, June 9, 2018
Hypoxylon rubiginosum(?) crust fungus on underside of a piece of wood on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest, near Huntsville. Texas, June 9, 2018
Yellow and dark-brown Hypoxylon rubiginosum(?) fungus on underside of a piece of wood on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest, near Huntsville. Texas, June 9, 2018
Close up of Hypoxylon rubiginosum(?) crust fungus on underside of a piece of wood on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest, near Huntsville. Texas, June 9, 2018
Crust fungus Hypoxylon rubiginosum(?) on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, August 31, 2019
Crust fungus Hypoxylon rubiginosum(?) on rotting wood on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, August 31, 2019
Fungus Hypoxylon rubiginosum(?) on rotting wood on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, August 31, 2019
Crust fungus Hypoxylon rubiginosum(?) on Lone Star Hiking Trail near Pole Creek in Sam Houston National Forest. Richards, Texas, September 7, 2019
Crust fungus Hypoxylon rubiginosum(?) on a log on Lone Star Hiking Trail near Pole Creek in Sam Houston National Forest. Richards, Texas, September 7, 2019
Fungus Hypoxylon rubiginosum(?) on rotting wood on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, September 14, 2019
Crust fungus Hypoxylon rubiginosum(?) on a fallen tree branch on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, November 26, 2020
Texture of corticioid fungus Hypoxylon rubiginosum(?) on a log on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, November 26, 2020
Details of corticioid fungus Hypoxylon rubiginosum(?) on a log on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, November 26, 2020
Crust fungus Rusty woodwart (Hypoxylon rubiginosum)(?) on a dry piece of wood in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 30, 2022
Orange crust fungus Hypoxylon rubiginosum on a fallen oak branch without bark on South Wilderness Loop Trail at Little Lake Creek Wilderness in Sam Houston National Forest near Richards. Texas, April 2, 2023
Orange crust fungus Hypoxylon rubiginosum with velvety anamorph (asexual stage) at its margins on South Wilderness Loop Trail at Little Lake Creek Wilderness in Sam Houston National Forest near Richards. Texas, April 2, 2023
Close-up of crust fungus Hypoxylon rubiginosum with light brown fluffy anamorph (asexual stage) at its margins on South Wilderness Loop Trail at Little Lake Creek Wilderness in Sam Houston National Forest near Richards. Texas, April 2, 2023
Pattern of orange crust fungus Hypoxylon rubiginosum on a fallen oak branch without bark on South Wilderness Loop Trail at Little Lake Creek Wilderness in Sam Houston National Forest near Richards. Texas, April 2, 2023
Close-up of crust fungus Hypoxylon rubiginosum and light brown anamorph (asexual stage) at its margins on South Wilderness Loop Trail at Little Lake Creek Wilderness in Sam Houston National Forest near Richards. Texas, April 2, 2023
Fungus Hypoxylon rubiginosum together with soft light brown anamorph (asexual stage) at its margins on South Wilderness Loop Trail at Little Lake Creek Wilderness in Sam Houston National Forest near Richards. Texas, April 2, 2023
Conidiophores and spores (conidia) (in Melzer) from soft light brown anamorph (asexual stage) of fungus Hypoxylon rubiginosum collected in Sam Houston National Forest near Richards. Texas, April 2, 2023
Conidiophores and conidia (in Melzer) from soft light brown anamorph (asexual stage) of fungus Hypoxylon rubiginosum collected in Sam Houston National Forest near Richards. Texas, April 2, 2023
Spore size 4.65 - 5.4 × 3.1 - 3.4 µm, length to width ratio Q = 1.5 - 1.7.
Conidiophores and conidia (in KOH) from smooth orange stuff covering fungus Hypoxylon rubiginosum, collected in Sam Houston National Forest near Richards. Texas, April 2, 2023
Conidiospores (in Melzer) from soft light brown anamorph (asexual stage) of fungus Hypoxylon rubiginosum, collected a day before in Sam Houston National Forest near Richards. Texas, April 3, 2023
Conidia (in Melzer) from soft light brown anamorph (asexual stage) of fungus Hypoxylon rubiginosum together with spores of some Ascomycete, collected a day before in Sam Houston National Forest near Richards. Texas, April 3, 2023
Conidia from soft light brown anamorph (asexual stage) of fungus Hypoxylon rubiginosum together with a large septate spore of some Ascomycete, collected a day before in Sam Houston National Forest near Richards. Texas, April 3, 2023
Conidiospores (in lugol) from soft light brown anamorph (asexual stage) of fungus Hypoxylon rubiginosum, collected a day before in Sam Houston National Forest near Richards. Texas, April 3, 2023
Spores (in KOH) of fungus Hypoxylon rubiginosum from a tiny black dot on wood, collected a day before in Sam Houston National Forest near Richards. Texas, April 3, 2023
Growth of tiny puffs of anamorph (asexual stage) of crust fungus Hypoxylon rubiginosum(?) on an elm log in wet area on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, April 16, 2023
Yellow corticioid fungus Hypoxylon rubiginosum together with is brown anamorph (asexual stage) around tunnels of bark beetles on an elm log in wet area on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, April 16, 2023
Thin yellow crust of corticioid fungus Hypoxylon rubiginosum around tunnels of bark beetles on an elm log in wet area on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, April 16, 2023
Details of thin yellow crust of corticioid fungus Hypoxylon rubiginosum around tunnels of bark beetles on an elm log in wet area on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, April 16, 2023
Close-up of thin yellow crust of corticioid fungus Hypoxylon rubiginosum around tunnels of bark beetles on an elm log in wet area on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, April 16, 2023
Tiny soft granules of anamorph (asexual stage) of crust fungus Hypoxylon rubiginosum(?) on an elm log in wet area on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, April 16, 2023
Conidia and conidiophores of anamorph (asexual stage) of crust fungus Hypoxylon rubiginosum growing as soft tiny granules on elm wood under a microscope in KOH, collected on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, April 16, 2023
Conidiophores and tissue of anamorph (asexual stage) of crust fungus Hypoxylon rubiginosum growing as soft tiny granules on elm wood under a microscope in KOH, collected on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, April 16, 2023
Conidia and conidiophores of anamorph (asexual stage) of crust fungus Hypoxylon rubiginosum growing as brown fluffy granules on elm wood under a microscope in KOH, collected on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, April 16, 2023
Tiny soft granules of anamorph (asexual stage) of crust fungus Hypoxylon rubiginosum(?) together with some orange tooth-like corticioid fungus on a fallen tree branch in Lick Creek Park. College Station, Texas, April 19, 2023The observations document the growth and characteristics of the crust fungus Hypoxylon rubiginosum in various locations in Texas, primarily in Sam Houston National Forest. The fungus was found on different types of wood, including elm and oak, often associated with tunnels of bark beetles. It appeared as a thin yellow or orange crust, sometimes with soft granules or fluffy growth. Microscopic examination revealed conidia and conidiophores of the anamorph (asexual stage) of the fungus. The observations were made over several years, from 2020 to 2023, and included photographs and microscopic images. The fungus was found in different stages of growth and in various environments, including wet and dry areas. Overall, the observations provide a detailed record of the morphology and ecology of Hypoxylon rubiginosum in Texas. The data can be useful for further research on this species.
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