Synonyms: Hydnochaete cinnamomea, Hydnochaete olivacea, Hydnochaete quisquiliaris, Hydnoporia fuscescens, Hydnum fuscescens, Hydnum olivaceum, Hymenochaetopsis olivacea, Irpex cinnamomeus, Irpex fuscescens, Irpex quisquiliaris, Pseudochaete olivacea, Sistotrema fuscescens, Sistotrema olivaceum, Xylodon quisquiliaris.
Common name: brown-toothed crust fungus.
Hydnoporia olivacea is a species of fungus that belongs to the family Meruliaceae. It is characterized by its effused-reflexed to stipitate habit, olive-green to brownish-gray upper surface, and white to cream-colored lower surface with small, cylindrical spines. In East and Central Texas, Hydnoporia olivacea typically grows on dead hardwood logs, stumps, and branches, particularly on oak, elm, and willow. Fruitbodies are often found in shaded, humid areas near streams and rivers, and can be common during the spring and fall months. The fungus is saprotrophic, playing a role in decomposing organic matter in these ecosystems.
Hydnoid crust fungus Hymenochaetopsis olivacea (Hydnoporia olivacea) on a fallen oak branch in Big Creek Scenic Area of Sam Houston National Forest. Shepherd, Texas, November 27, 2019
Lone Star Hiking Trail, Coldspring, TX 77331, USA
Texture of hydnoid crust fungus Hymenochaetopsis olivacea (Hydnoporia olivacea) on a fallen oak branch in Big Creek Scenic Area of Sam Houston National Forest. Shepherd, Texas, November 27, 2019Lone Star Hiking Trail, Coldspring, TX 77331, USA
Hydnoid crust fungus Hymenochaetopsis olivacea (Hydnoporia olivacea) on a fallen oak limb in Lick Creek Park. College Station, Texas, January 3, 2020Iron Bridge Trail, College Station, TX 77845, USA
Hydnoid crust fungus Hymenochaetopsis olivacea (Hydnoporia olivacea) on a fallen oak branch in Lick Creek Park. College Station, Texas, January 3, 20201405 Bulle Rock Ct, College Station, TX 77845, USA
Hydnoid crust fungus Hymenochaetopsis olivacea (Hydnoporia olivacea) with tiny red larvae on a fallen oak branch in Lick Creek Park. College Station, Texas, January 3, 20201405 Bulle Rock Ct, College Station, TX 77845, USA
Hydnoid crust fungus Hymenochaetopsis olivacea (Hydnoporia olivacea) together with a black crust fungus Chaetosphaerella phaeostroma on a fallen oak branch in Brazos Bend State Park. Needville, Texas, February 15, 202040 Acre Lake Trail, Fort Bend County, Texas, United States
Hydnoid crust fungus Hymenochaetopsis olivacea (Hydnoporia olivacea) growing on a black crust fungus Chaetosphaerella phaeostroma on a fallen oak branch in Brazos Bend State Park. Needville, Texas, February 15, 202040 Acre Lake Trail, Fort Bend County, Texas, United States
Close-up of hydnoid crust fungus Hymenochaetopsis olivacea (Hydnoporia olivacea) on a fallen oak branch in Brazos Bend State Park. Needville, Texas, February 15, 202040 Acre Lake Trail, Fort Bend County, Texas, United States
Hydnoid crust fungus Hymenochaetopsis olivacea (Hydnoporia olivacea) on a dry cypress elm(?) tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, September 5, 202023400 Park Rd 12, Washington, TX 77880, USA
Texture of hydnoid crust fungus Hymenochaetopsis olivacea (Hydnoporia olivacea) on a dry cypress elm(?) tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, September 5, 202023400 Park Rd 12, Washington, TX 77880, USA
Close-up of hydnoid crust fungus Hymenochaetopsis olivacea (Hydnoporia olivacea) on a dry cypress elm(?) tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, September 5, 202023400 Park Rd 12, Washington, TX 77880, USA
Details of hydnoid crust fungus Hymenochaetopsis olivacea (Hydnoporia olivacea) on a dry cypress elm(?) tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, September 5, 202023400 Park Rd 12, Washington, TX 77880, USA
Freshly grown hydnoid crust fungus Hymenochaetopsis olivacea (Hydnoporia olivacea) on a dry cypress elm(?) tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, September 5, 202023400 Park Rd 12, Washington, TX 77880, USA
Crust fungus Hymenochaetopsis olivacea (Hydnoporia olivacea) with lichens on a fallen tree branch on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, October 24, 2020Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Hydnoid crust fungus Hymenochaetopsis olivacea (Hydnoporia olivacea) on a fallen tree branch on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, October 24, 2020Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Corticioid fungus Hymenochaetopsis olivacea (Hydnoporia olivacea) on an oak branch in Huntsville State Park. Texas, December 18, 2020Lone Star Trail, Huntsville, TX 77340, USA
Fungus Hymenochaetopsis olivacea (Hydnoporia olivacea) and lichens on an oak branch in Huntsville State Park. Texas, December 18, 2020Lone Star Trail, Huntsville, TX 77340, USA
Texture of fungus Hymenochaetopsis olivacea (Hydnoporia olivacea) and lichens on an oak branch in Huntsville State Park. Texas, December 18, 2020Lone Star Trail, Huntsville, TX 77340, USA
Brown-toothed crust fungus (Hydnoporia olivacea) together with some polypore on a fallen oak branch in Washington-on-the-Brazos State Historic Site. Washington, Texas, October 4, 202123400 Park Rd 12, Washington, TX 77880, USA
Brown-toothed crust fungus (Hydnoporia olivacea) growing over some resupinate polypore on a fallen oak branch in Washington-on-the-Brazos State Historic Site. Washington, Texas, October 4, 202123400 Park Rd 12, Washington, TX 77880, USA
Spores of brown-toothed crust fungus (Hydnoporia olivacea) collected a day before on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, October 31, 2022In East and Central Texas, Hydnoporia olivacea was observed growing on various substrates, including fallen oak branches, limbs, and trunks, as well as a dry cypress elm tree. The fungus was found in several locations, including Sam Houston National Forest, Lick Creek Park, Brazos Bend State Park, Washington-on-the-Brazos State Historic Site, and Huntsville State Park. It often co-occurred with other fungi, such as Chaetosphaerella phaeostroma and resupinate polypores, and was also found with lichens. The fungus displayed a range of textures and colors, and its spores were collected for further study. Tiny red larvae were observed on one occasion, suggesting that the fungus may be a food source for insects. Overall, Hydnoporia olivacea appears to be a common and widespread species in East and Central Texas, with a preference for deciduous tree substrates.
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