Tiny white mushrooms found at the bottom of a 30L pot of potatoes in the garden.
Crepidotus was my best guess based on the general appearance of them and the spore size and characteristics seem to support that. However I've not tried to look up species descriptions so I may be entirely wrong.
Spore size: 6-8 x (3.5) 4-4.5µm.
Ellipsoid to amygdaliform, hyaline with a slight greyish tint that became more noticeable on dropping the focus out. Surface appeared rough so may be responsible for that greyish colour. Yellow in Melzers.
Spore print colour appeared white but was so faint I can't be sure if it has the pinkish colour that Crepidotus is described as having.
on conifer, probably Eastern White Pine
pores rounded to slightly angular, 7-8 pores per mm.
spores hyaline, “lunate” or crescent shaped, usually with 2 oil droplets, 2.8-3.5 x 1-1.3µm
Me: 3 x 1.2µm
clamps present, dimitic, the last photo shows what I think are "rosette crystals" mentioned in the description in Miettinen and Larsson "Sidera, a new genus in Hymenochaetales with poroid
and hydnoid species" Mycol Progress (2011) 10:131–141
This crust fungus was in patches um to a centimeter across. As their center, these fungi were somewhat yellow, but. became progressively more purple as you moved out. They appeared slightly hairy (particularly at their edges), and were on the underside of decaying hardwood.
At first, I was unsure that this was a fungus, but then I realized that the hairs are very similar to cultured fungi. After looking in Mushrooms of the Gulf Coast States (Bessette et al. 2019), I realized this was most likely a crust fungus. As such, I then Googled "Florida purple crust fungi," finding the species Phlebiopsis crassa. The description of this fungus, including the hair, purple color, fall collection time, and location (decaying wood) match this specimen. The only macroscopic difference was the small size of this fungus, about a third of the smallest size reported on mushrooomexpert.com, but I attributed this to the drier conditions before collection.I was unable to find any similar Phlebiopsis species, so I concluded this specimen was Phlebiopsis crassa.