A. aurantia (above) has an orange fruiting body with cup-like folds. Microscopically, the spores are big, hyaline, and have spiny projections. They range from 17-24 × 9-11 micrometers. As part of the Discomycetes, the spores start out encased in an ascus in a half-circular, disc-shaped apothecium. A. aurantia also has small sterile hyphal structures called paraphyses inside the apothecia which appear to have rounded ends.
Aleuria aurantia closely resembles Otidea onotica and Sowerbyella rhenana and can be distinguished by them macroscopically and microscopically.
Macroscopically, A. aurantia has a brighter, richer orange color than O. onotica and S. rhenana which are more of a pale orange or dark yellow-orange. Microscopically, the spores of O. onotica are much smaller and do not have projections which A. aurantia does. In addition, S. rhenana has a stalk and A. aurantia is stalk-less.