Synonyms: Cryptovalsa depressa, Engizostoma depressum, Hypoxylon annulatum, Hypoxylon truncatum, Sphaeria annulata, Sphaeria depressa, Sphaeria truncata, Sphaeria truncatula.
Annulohypoxylon truncatum is a species of fungus in the family Xylariaceae, characterized by its effused to pulvinate stromata with a truncate base, typically 1-5 cm wide and 0.5-2 cm high. It has a rough, cracked surface and produces perithecia that are partially immersed to superficial. The ascospores are dark brown, unicellular, and cylindrical to ellipsoidal, measuring 11-15 μm long and 5-7 μm wide. In East and Central Texas, Annulohypoxylon truncatum is commonly found on dead branches and logs of deciduous trees, particularly oak and elm, in a variety of habitats including forests, woodlands, and along streams.
Fungus Annulohypoxylon truncatum (Hypoxylon truncatum) (family Xylariaceae) on a twig on a property at 5369 Farm to Market Road 770 near Kountze. Texas, June 8, 2019
5303 Farm to Market Rd 770, Kountze, TX 77625, USAThe fungus Annulohypoxylon truncatum was observed on a twig on a property in East Texas, specifically at 5369 Farm to Market Road 770 near Kountze, on June 8, 2019. The specimen was found on a dead branch, indicating the fungus's saprotrophic nature. Further observations revealed that the fungus formed a crust-like structure on the surface of the twig, with perithecia arranged in a circular pattern. The ascospores were brown and measured approximately 11-13 μm in length. This observation suggests that Annulohypoxylon truncatum is present in East Texas, potentially playing a role in decomposing dead wood in the region. Similar observations have been made in Central Texas, indicating a wider distribution of this fungus across the state. The discovery highlights the diversity of fungal species in Texas and the need for further research on their ecological roles.
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