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Even though I ID a lot on this site, I'm rather unqualified to ID mushrooms (even with the help of sites like urbanmushrooms.com).

Can anyone help me ID this mushroom species?

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Attributes:

  • Morphology: convex cap; gills possibly free, adnexed, or sinuate (I really can't tell!); stem is equal or slightly club-shaped
  • Color: Brown cap; white gills; white/brown stalk
  • Size: 1.5-2.5 inches tall; cap 0.25-1 inch diameter
  • Other sensory: cap texture is smooth/waxy similar to white button mushroom one buys in a grocery store; smell is minimal but perhaps slightly musty?
  • Location: Eastern Ohio (Ohio Valley, about 10 miles West of the Ohio River)
  • Habitat: growing in recently moist (though almost dry) grass near (but not on) a rotting stump. Violets, clovers, and other herby weeds also growing in lawn nearby.
  • Timing: Mid July; found on a sunny day after a week of on-and-off rain

More photos (click to enlarge):

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stump of which mushrooms were growing nearby

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  • $\begingroup$ You will need a spore print ; put a cap on newsprint in an undisturbed location for a day or so. The newsprint gives both a white and black background reference. $\endgroup$ Jul 15 at 3:19
  • $\begingroup$ @blacksmith37 already in that process... waiting [not so] patiently $\endgroup$ Jul 15 at 3:39
  • $\begingroup$ Possibly Marasmiellus luxurians $\endgroup$ Jul 15 at 3:50
  • $\begingroup$ those mushrooms grow a lot near me. $\endgroup$ Jul 17 at 0:14
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I was advised by Walt Sturgeon, author of Appalachian Mushroom: a Field Guide as well as members of Poisons Help; Emergency Identification For Mushrooms & Plants Facebook group that this is likely Marasmiellus luxurians.

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Credit: Walt Sturgeon 2018 | Source: Mushroomobserver.org

Mushroomexpert.org provides the following supportive pieces of info:

  • Ecology matches: "growing gregariously or in tight clusters in woodchips, or on lawns (probably fruiting from dead, buried roots), and, rarely, fruiting directly from logs and stumps; summer and fall."

  • Location matches: "widely distributed and relatively common east of the Great Plains".

Walt Sturgeon suggested the following when I asked him about comparing this to similar-looking Entoloma:

Marasmiellus has a white to buff spore print. Entoloma spores are ruddy pink. A spore print is made by removing the stem and place the mushroom gill side down on white paper. cover with a bowl. wait several hours and there should be a spore deposit on the paper.

  • My spore prints (though knocked over prematurely) did appear to be white.
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