Synonyms: Poria biguttulata, Poria calcea, Skeletocutis biguttulata.
Incrustoporia biguttulata is a crust fungus that grows on deciduous trees, particularly oak and elm. It has a grayish-brown to brown crust-like appearance with a smooth to slightly wrinkled surface. In East and Central Texas, it typically fruits in the spring and fall, forming small, circular to irregular patches on the trunks and branches of host trees. The fungus is relatively rare in the region, but can be found in wooded areas with rich soil and abundant moisture.
Resupinate polypore mushroom Incrustoporia biguttulata (Skeletocutis biguttulata) on a fallen and rotting Eastern red cedar tree (Juniperus virginiana) in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 3, 2023
23880 Farm-to-Market Road 1155, Washington, Texas 77880, United States
White, turning brown resupinate polypore mushroom Incrustoporia biguttulata (Skeletocutis biguttulata) on underside of a fallen Eastern red cedar tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 3, 202323880 Farm-to-Market Road 1155, Washington, Texas 77880, United States
Close-up of white, turning brown resupinate polypore mushroom Incrustoporia biguttulata (Skeletocutis biguttulata) on underside of a fallen Eastern red cedar tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 3, 202323880 Farm-to-Market Road 1155, Washington, Texas 77880, United States
Mature resupinate polypore mushroom Incrustoporia biguttulata (Skeletocutis biguttulata) on underside of a fallen Eastern red cedar tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 3, 202323880 Farm-to-Market Road 1155, Washington, Texas 77880, United States
Texture of resupinate polypore mushroom Incrustoporia biguttulata (Skeletocutis biguttulata) on underside of a fallen Eastern red cedar tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 3, 202323880 Farm-to-Market Road 1155, Washington, Texas 77880, United States
Close-up of resupinate polypore mushroom Incrustoporia biguttulata (Skeletocutis biguttulata) on underside of a fallen Eastern red cedar tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 3, 202323880 Farm-to-Market Road 1155, Washington, Texas 77880, United States
Spores of resupinate polypore mushroom Incrustoporia biguttulata (Skeletocutis biguttulata) from a fallen juniper, collected a day before in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 4, 2023
Snowy white resupinate polypore mushroom Incrustoporia biguttulata (Skeletocutis biguttulata) on a fallen and rotting Eastern red cedar tree (Juniperus virginiana) in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 20, 2024Washington-on-the-Brazos State Historic Site, 23400, Park Road 12, Washington, Washington County, Texas, 77880, United States
Close-up of snowy white resupinate polypore mushroom Incrustoporia biguttulata (Skeletocutis biguttulata) on a fallen juniper in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 20, 2024Washington-on-the-Brazos State Historic Site, 23400, Park Road 12, Washington, Washington County, Texas, 77880, United States
Feathery growth of snowy white resupinate polypore mushroom Incrustoporia biguttulata (Skeletocutis biguttulata) on a fallen juniper in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 20, 2024Washington-on-the-Brazos State Historic Site, 23400, Park Road 12, Washington, Washington County, Texas, 77880, United States
Resupinate polypore mushroom Incrustoporia biguttulata (Skeletocutis biguttulata) with a hybernating long-necked seed bug (small assassin bug, Myodocha serripes) on a fallen juniper in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 20, 2024Washington-on-the-Brazos State Historic Site, 23400, Park Road 12, Washington, Washington County, Texas, 77880, United States
Thin growth of snowy white resupinate polypore mushroom Incrustoporia biguttulata (Skeletocutis biguttulata) on a fallen juniper in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 20, 2024Washington-on-the-Brazos State Historic Site, 23400, Park Road 12, Washington, Washington County, Texas, 77880, United States
Snowy white resupinate polypore mushroom Incrustoporia biguttulata (Skeletocutis biguttulata) on underside of a fallen Eastern red cedar tree (Juniperus virginiana) in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 20, 2024Washington-on-the-Brazos State Historic Site, 23400, Park Road 12, Washington, Washington County, Texas, 77880, United States
Allantoid spores with two distinct, darker guttules at the each end, of resupinate polypore mushroom Incrustoporia biguttulata (Skeletocutis biguttulata) from a fallen juniper, collected a day before in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 21, 2024
Spore size 3.6 - 4.8 × 1 - 1.3 µm, length to width ratio Q = 3 - 3.6.
Fusoid cystidioles(?) (in Congo Red) of resupinate polypore mushroom Incrustoporia biguttulata (Skeletocutis biguttulata) from a fallen juniper, collected a day before in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 21, 2024
Tissues of resupinate polypore mushroom Incrustoporia biguttulata (Skeletocutis biguttulata) from a fallen juniper, collected a day before in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 21, 2024In East and Central Texas, specifically at the Washington-on-the-Brazos State Historic Site, observations of Incrustoporia biguttulata revealed a resupinate polypore mushroom that grows on fallen and rotting Eastern red cedar trees. The fungus appears white, eventually turning brown, with a feathery or thin growth pattern. It was found on the underside of fallen trees, with some specimens displaying a snowy white color. Close-up observations showed the texture of the fungus and the presence of allantoid spores with distinct guttules. Additional findings included the coexistence of the fungus with a hybernating long-necked seed bug and microscopic features such as fusoid cystidioles and tissue structures. The observations were made on multiple dates, including January 3, 2023, and January 20-21, 2024.
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