Synonyms: Delicatula gracilis, Marasmiellus gracilis, Mycena gracilis, Omphalia gracilis, Omphalina gracilis, Trogia gracilis.
Hemimycena gracilis is a small, delicate mushroom with a bell-shaped to conical cap that ranges from 5-15 mm in diameter, typically grayish-brown to pale brown in color. The gills are narrowly attached to the stem and are often the same color as the cap. It grows on decaying wood, twigs, and other organic matter. In East and Central Texas, Hemimycena gracilis has been found in wooded areas, particularly in association with oak and pine trees, from spring to fall, with peak fruiting typically occurring during the spring months.
Observations of Hemimycena gracilis in East and Central Texas reveal that the fungus grows in various environments. On Caney Creek Trail in Sam Houston National Forest, it was found in a wet oak cavity in November 2019. In the same forest, on Little Lake Creek Loop Trail, it grew on a dead mossy osage orange tree (Maclura) on two separate occasions: December 22, 2020, with multiple sightings on the same trail. The fungus appears to thrive in moist, possibly decaying environments, and can be found on different types of trees, including oak and osage orange. The sightings were recorded in the fall and early winter seasons, suggesting that Hemimycena gracilis may be active during these periods in East and Central Texas. The mushrooms are described as tiny and white, growing in small quantities on their host trees.
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