Spores: The spores are smooth, ellipsoid, 10--12 x 5--6.5 µm, and contain two large oil drops.
Conservation Status: Not of concern
The name Otidea is derived from the Greek word for ear and refers to the shape of the fruitbodies which, in some species, is much like that of a rabbit ear. Other species look as though the top part of the ear had been chopped off. Otidea concinna (= O. cantharella (Fries) Quélet and Flavoscypha cantharella (Fries) Harmaja) belongs to the latter group. It has bright yellowish fruiting bodies that occur singly or close-together in groups. The paraphyses are slender, bent at the tips, and encrusted with yellow material. Similar dull yellow or yellowish brown species include O. microspora (Kanouse) Harmaja (= O. alutacea var. microspora), dull yellow, with spores 9--10 x 5--6.5 µm, and O. alutacea (Persoon: Fries) Massee, pale yellowish brown, with spores 14--16 x 7--9 µm. Differentiating among these species is not a simple task and reliable distribution information will not be obtainable until the species concepts are better defined, including consideration of molecular data.