Synonyms: Agaricus vesuvianus, Contumyces vesuviana, Jacobia vesuviana, Omphalia vesuviana, Omphalina vesuviana.
Contumyces vesuvianus is a species of fungus that belongs to the family Agricolaceae. It is characterized by its small to medium-sized fruiting bodies, typically 1-5 mm in diameter, with a reddish-brown to dark brown cap and a stipe of similar color. In East and Central Texas, Contumyces vesuvianus has been found growing on decaying wood, particularly on hardwoods such as oak and maple, in moist environments like stream banks and floodplains. The fungus typically fruits in the spring and summer months, and its presence is often associated with rich, organic soils.
Small omphalinoid mushrooms Contumyces vesuvianus(?) on a side of Yaupon Loop Trail, under Yaupon, oaks, in partial shade, on mats of creeping spurge, in Lick Creek Park. College Station, Texas, October 19, 2023
Yaupon Loop Trail, College Station, Brazos County, Texas, United States
Side view of small omphalinoid mushrooms Contumyces vesuvianus(?) on mat of creeping spurge, in Lick Creek Park. College Station, Texas, October 19, 2023Yaupon Loop Trail, College Station, Brazos County, Texas, United States
Tissues of small omphalinoid mushrooms Contumyces vesuvianus(?) at low magnification, collected in Lick Creek Park. College Station, Texas, October 19, 2023
Basidia of small omphalinoid mushrooms Contumyces vesuvianus(?), collected in Lick Creek Park. College Station, Texas, October 19, 2023
Basidia and spores of small omphalinoid mushrooms Contumyces vesuvianus(?), collected in Lick Creek Park. College Station, Texas, October 19, 2023
Spores (spore size 8.5-10.1x4.3-5.4) of small omphalinoid mushrooms Contumyces vesuvianus(?), collected in Lick Creek Park. College Station, Texas, October 19, 2023
Spore size 8.5 - 10.1 × 4.32 - 5.4 µm, length to width ratio Q = 1.85 - 2.Contumyces vesuvianus was observed on the side of Yaupon Loop Trail in Lick Creek Park, College Station, Texas, under Yaupon and oaks in partial shade. The fungus grew on mats of creeping spurge. Upon closer inspection, the mushrooms had a small omphalinoid shape. Under low magnification, the tissues of the mushroom were examined. The basidia of the fungus were also observed, as well as the basidia and spores together. The spores measured 8.5-10.1x4.3-5.4 microns in size. These observations were made on October 19, 2023, suggesting that Contumyces vesuvianus can be found in East and Central Texas during this time of year, specifically in the described habitat. The fungus appears to have a specific association with creeping spurge and partial shade.
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