Synonyms: Marasmiellus omphaliiformis, Marasmius omphaliiformis.
Hydropus omphaliiformis is a small to medium-sized agaric fungus that grows in clusters or scattered groups on soil, decaying wood, or organic matter. It has a bell-shaped to convex cap that ranges from 1-4 cm in diameter, with a grayish-brown to tan color and a smooth to wrinkled surface. The gills are crowded, narrow, and free from the stem, with a similar color to the cap. In East and Central Texas, Hydropus omphaliiformis typically fruits from spring to fall, often in association with oak, pine, or mixed hardwood forests. It can be found in a variety of habitats, including wooded areas, fields, and along roadsides, particularly in areas with rich soil and ample moisture.
Small mushrooms Hydropus omphaliiformis on rotting oak in Lick Creek Park. College Station, Texas, September 11, 2018
Raccoon Run, College Station, TX 77845, USA
Underside of small mushrooms Hydropus omphaliiformis on rotting oak in Lick Creek Park. College Station, Texas, September 11, 2018Raccoon Run, College Station, TX 77845, USA
Side view of mushrooms Hydropus omphaliiformis on rotting oak in Lick Creek Park. College Station, Texas, September 11, 2018Raccoon Run, College Station, TX 77845, USA
Mushrooms Hydropus omphaliiformis(?) on a piece of wood in area of floodplain on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, September 4, 2022Lone Star Hiking Trail, Montgomery County, Texas, United States
Underside of mushrooms Hydropus omphaliiformis(?) on a piece of wood on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, September 4, 2022Lone Star Hiking Trail, Montgomery County, Texas, United States
Spores of small yellowish omphalinoid mushrooms Hydropus omphaliiformis(?) from rotting wood collected in Sam Houston National Forest near Montgomery. Texas, September 4, 2022Observations of the fungus Hydropus omphaliiformis in East and Central Texas reveal its growth on decaying oak and wood. In Lick Creek Park, College Station, small mushrooms were found on rotting oak in September 2018, with images showcasing their underside and side views. Similarly, in Sam Houston National Forest near Montgomery, mushrooms resembling Hydropus omphaliiformis were discovered on a piece of wood in a floodplain area along Caney Creek in September 2022. The underside of these mushrooms was also observed, and spores from small yellowish omphalinoid mushrooms collected from rotting wood in the same forest were examined. These findings suggest that Hydropus omphaliiformis thrives in moist environments with abundant decaying wood, particularly in oak-dominated ecosystems. The species appears to be widespread in East and Central Texas, with sightings in both urban parks and national forests.
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