Crepidotus "applanatus-VA01"
Description based on information and notes from iNaturalist observations with DNA confirmation:
Caps white and conchate to depressed at pseudostiptate attachment in shape. Caps at least 1mm - 15mm wide with some appearing larger but without measurements. Growing scattered to perhaps densely gregarious. Most commonly reported to be on or nearby Beech (Fagus) and then Maple (Acer). additional tree especies reported nearby or in the forest are Oak (Quercus), Hemlock (Tsuga), Rhododendron, Magnolia, Prunus serotina, "Hardwoods", Red Pine (Pinus resinosa), and Red Oak (Quercus rubra?). Brown spores are 5 microns on average, globose, and "roughened" to "spiny" but may be punctate. Growing late June through late October but most commonly collected in July/August around the great lakes and extending south in the Appalachian mountains to at least Virginia. [1]
Observations with substrate info:
mixed hardwood (oak, rhododendron, maple, magnolia, beech) very few conifers
https://www.inaturalist.org/observations/30854834
Hardwood
https://www.inaturalist.org/observations/94739410
Well rotted hardwood possible maple/beech
https://www.inaturalist.org/observations/126191181
Well decayed wood. Hemlock/beech
https://www.inaturalist.org/observations/128785512
Rotted hardwood log. Maple.
https://www.inaturalist.org/observations/187533773
Oak and beech pictured. Possible maple
https://www.inaturalist.org/observations/181617972
Red maple nearby possibly
https://www.inaturalist.org/observations/187689155
The [forest] habit there is originally Beech-Hemlock with some sections of red pine plantation and younger red oak. But I didn’t note this one specifically.
https://www.inaturalist.org/observations/128719454
Prunus serotina and beech are both there [in the area], yellow birch, red maple, maybe ash or basswood nearby, but much less of that.
https://www.inaturalist.org/observations/94739410
Observations with microscopy:
Spore Average 5 microns and roughened. Other structures pictures
https://www.inaturalist.org/observations/126191181
Average spore size 5 microns. Spiny. Entire gill edge cheilocystidia.
https://www.inaturalist.org/observations/128785512
Micro description but no images:
Spores globose and punctate.
https://www.inaturalist.org/observations/187533773
Growing few to densely gregarious. Measuring <1mm to 10mm and larger. one approximate size in a photo was 15mm. Some appearing much larger when over mature but there are no reference measurements or items to judge approximate size.
Pseudo-stiptate
https://www.inaturalist.org/observations/106517622
Spore color clearly typical Crepidotus brown:
https://www.inaturalist.org/observations/171494364
Seasonality:
6/28 through 10/21