on a living trunk of Acer saccharum

Asci, octospored and spore mostly disorganized in the asci

Ascospores 25-28X7-9, usually with 3 septa, rarely 4 or 5, and terminal cells are normally paler than center cells.

H. angustatum have smaller spores (mostly less than 20u long) and do not have paler terminal ascospore cells