This seemed much too small and fragile to be a Calocera, so myself and Marcus Lopez scoped it. We found zero hymenial elements or hyphae, only oil droplets and some cuboid crystals, like these, which are byproducts of certain myxogastrids. See the “Myxomycetes Calcification” chapter of “Origin, Evolution, and Modern Aspects of Biomineralization in Plants and Animals.”

EDIT: The missing hyphae, basidia and spores have magically and inexplicably decided to show themselves in a mount made from dried tissue. Mucronella looks likely after all.

Spore Measurements (made with Piximetre v5.9 R 1520):

(4.3) 4.4 – 5 (5.3) × (2.4) 2.8 – 3.2 µm

Q = 1.5 – 1.7 (1.8) ; N = 10

Me = 4.8 × 2.9 µm ; Qe = 1.6

4.34 2.82

4.78 2.85

4.44 2.45

5.01 3.08

4.90 2.93

4.71 2.97

4.86 2.86

4.70 3.22

4.70 3.13

5.32 3.21

Substrate: decorticate wood

Habitat: mixed hardwood conifer forest

Ecoregion: Eastern Forest-Boreal Transition (NA0406)

Collectors: D. Newman & P. Kaishian

Collection #: CLBS019

Collected for the 2016 SUNY-ESF Ecological Monitoring and Biodiversity Assessment (EFB 202) Mycology Section