Synonyms: Astylospora umbonata, Atylospora umbonata, Psathyra umbonata.
Psathyrella umbonata is a small to medium-sized fungus with a bell-shaped cap that ranges from 1-4 cm in diameter, featuring a distinctive umbo. The cap is grayish-brown to brown, often with a darker center, and the gills are crowded and light brown. The stem is slender, 2-6 cm long, and white to light brown. In East and Central Texas, Psathyrella umbonata typically grows in clusters on rich soil, decaying wood, or dung, particularly in wooded areas and along streams. It fruits from spring to fall, with peak activity during the summer months when humidity is high.
Brittlestem mushrooms Psathyrella umbonata on a recent cutting in Lick Creek Park. College Station, Texas, June 21, 2018
Yaupon Loop, College Station, TX 77845, USA
Psathyrella umbonata mushrooms on wood chips on a forest cutting in Lick Creek Park. College Station, Texas, October 12, 2018Post Oak Trail, College Station, TX 77845, USA
Brittlestem mushrooms Psathyrella umbonata on a sewage cutting in Lick Creek Park. College Station, Texas, January 15, 2020Iron Bridge Trail, College Station, TX 77845, USA
Brittlestem mushrooms Psathyrella umbonata on disturbed soil of a recent sewage cutting in Lick Creek Park. College Station, Texas, January 15, 2020Iron Bridge Trail, College Station, TX 77845, USAObservations of Psathyrella umbonata in East and Central Texas reveal the fungus's tendency to thrive in disturbed environments. On June 21, 2018, it was spotted on a recent cutting in Lick Creek Park, College Station. Later, on October 12, 2018, it was found growing on wood chips in a forest cutting within the same park. In January 2020, the fungus was observed on both a sewage cutting and disturbed soil of a recent sewage cutting in the park. These sightings suggest that Psathyrella umbonata can colonize a variety of substrates, including cuttings, wood chips, and disturbed soil, indicating its adaptability to different environments. The consistent presence of the fungus in Lick Creek Park highlights its ability to thrive in areas with human disturbance. Its growth was observed across different seasons, from summer to winter.
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