Name: Urnula craterium
Authority: (Schweinitz, 1822) Fries , 1851
Vouchered by: Brad Bomanz
Date found: 5/7/2013
Collected by: Brad Bomanz
Voucher ID: 80
Confirming Mycologist: Dr. Andrew Methven
Latitude: 038.526 N
Longitude: 090.561 W
City: Eureka
County: St. Louis
State: Missouri
Site location: Tyson Research Center
Habitat: woods - hardwoods mixed
Moisture conditions: very moist
Substrate: wood - dead
Reference document: The Audubon Society Field Guide to North American Mushrooms - 1981
Author:Alfred A. Knopf
ISBN No: 0-394-51992-2
Page no:342
Spore length: 23 - 42 microns
Spore width: 11 - 13.5 microns
Spore color: clear
Spore texture: smooth
Spore shape: elliptical
Spore print color: light tan (read comments)
Chemical reaction: n/d
Spore print was extremely light on a piece of glass. When scraped off with a razor blade the spores appeared to be a light tan. Spore size is larger than field guides call out but I recalibrated the microscope using a stage micrometer and still got the same results, thereby the large number of spore photos to demonstrate the accruacy of the microscope and spore photos. Dr. Andrew Methven stated "Certainly U. craterium although the 42 um ascospores is the extreme for the length." Close examination by Dr. Methven (see annotation above) combined with the 2015 DNA analysis confirmed that this specimen is Urnula craterium.

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