Field ID by Nick Hill, Tom Neily. On recently (2012) Jack Pine-Broom Crowberry barrens https://dalspace.library.dal.ca/bitstream/handle/10222/74068/HillPatriquinFireConf.pdf
On old Populus tremuloides. 2nd image showing asci apical amyloid structure (lugol's)
with Normandina pulcella on yellow birch