Synonyms: Hypoxylon corticium, Sphaeria aquila, Sphaeria corticium.
Rosellinia corticium is a species of fungus in the family Xylariaceae, order Xylariales, class Sordariomycetes, phylum Ascomycota. It is characterized by its effused-reflexed to stipitate basidiocarp, with a smooth to warted, dark brown to black surface, and white to pale yellow interior. In East and Central Texas, Rosellinia corticium has been found on decaying logs, stumps, and roots of various tree species, often in shaded, humid environments. It typically fruits in the spring and fall, producing perithecia that are embedded in a carbonaceous stromata. The fungus is relatively common in the region, particularly in areas with rich soil and abundant organic matter.
Small black Pyrenomycete fungus Rosellinia corticium(?) (Xylariaceae) on a tall smooth fallen tree in dense young bamboo growth, with oaks, hackberry, Yaupon, in Hensel Park. College Station, Texas, April 28, 2022
East Brookside Drive, Bryan, Brazos County, Texas, 77801, United States
Black Pyrenomycete fungus Rosellinia corticium(?) on a tall smooth fallen tree in Hensel Park. College Station, Texas, April 28, 2022East Brookside Drive, Bryan, Brazos County, Texas, 77801, United States
Spores of black Pyrenomycete fungus Rosellinia corticium(?) collected in Hensel Park. College Station, Texas, April 28, 2022
Spores and aski(?) of black Pyrenomycete fungus Rosellinia corticium(?) collected in Hensel Park. College Station, Texas, April 28, 2022
Spore size 12 - 15.7 × 7.3 - 7.7 µm, length to width ratio Q = 1.64 - 2.17.Observations of the fungus Rosellinia corticium in East and Central Texas reveal its presence on fallen trees in dense woodland areas. In Hensel Park, College Station, Texas, the fungus was found on a tall, smooth fallen tree surrounded by young bamboo growth, oaks, hackberry, and Yaupon on April 28, 2022. The fungus was identified as a small black Pyrenomycete, with spores collected for further examination. Additional observations confirmed the presence of spores and ascii of the fungus in the same location, suggesting that Rosellinia corticium is active in this region. The fungus appears to thrive in shaded, wooded areas with abundant organic matter, such as fallen trees and dense undergrowth. Multiple sightings in Hensel Park indicate a established presence of the fungus in this area of East and Central Texas.
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