Synonym: Hysterium pulicare.
Hysterium angustatum is a species of fungus in the family Hysteriaceae, order Hysteriales, class Dothideomycetes, phylum Ascomycota. It is characterized by its elongated, narrow, and often curved fruiting bodies that resemble tiny horns or combs. In East and Central Texas, Hysterium angustatum has been found on deciduous trees, particularly oak and elm, where it grows on dead branches and twigs, often in shaded and humid areas. The fungus produces ascospores that are typically dark brown to black, multiseptate, and measure 60-120 μm in length.
Black Hysteroid pyrenomycetous fungi Hysterium angustatum(?) on an old dead osage orange (Maclura) tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, November 24, 2020
Old Washington Town Site Loop Trail, Washington, TX 77880, USA
Close-up of black Hysteroid pyrenomycetous fungi Hysterium angustatum(?) on an old dead barkless osage orange (Maclura) tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, November 24, 2020Old Washington Town Site Loop Trail, Washington, TX 77880, USA
Black Hysteroid pyrenomycetous fungi Hysterium angustatum(?) on an old dead osage orange (Maclura) tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 19, 2021Old Washington Town Site Loop Trail, Washington, TX 77880, USA
Black Hysteroid pyrenomycetous fungi Hysterium angustatum(?) on an old dry osage orange (Maclura) tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 22, 202223450 Farm-to-Market Road 1155, Washington, Texas 77880, United States
Asci and spores of black Hysteroid pyrenomycetous fungus Hysterium angustatum(?) from a dry maclura tree at low magnification, collected in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 22, 2022
Asci and paraphyses of black Hysteroid pyrenomycetous fungus Hysterium angustatum(?) from a dry maclura tree at low magnification, collected in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 22, 2022
Asci with spores of black Hysteroid pyrenomycetous fungus Hysterium angustatum(?) under a microscope in KOH, collected in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 22, 2022
Asci and paraphyses of black Hysteroid pyrenomycetous fungus Hysterium angustatum(?) under a microscope in KOH, collected in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 22, 2022Observations of the fungus Hysterium angustatum in East and Central Texas reveal its presence on old dead osage orange (Maclura) trees. The fungus was found at Washington-on-the-Brazos State Historic Site in Washington, Texas, on multiple occasions: November 24, 2020, April 19, 2021, and May 22, 2022. It was observed growing on barkless and dry tree trunks. Microscopic examination of the fungus revealed asci and spores, with asci containing spores and paraphyses visible under low magnification and in KOH. The fungus appears to be a black Hysteroid pyrenomycetous fungus, consistent with Hysterium angustatum(?), although the identification is tentative. The repeated observations suggest that the fungus is persistent and widespread in the area, at least on osage orange trees.
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