Calycina citrina  

Asexual morph not known.
Ascomata apothecia, often aggregated in swarms, 0.5-2.5 mm diam., erumpent from bark, shallowly cup-shaped with a slightly concave disc, bright yellow, very shortly stipitate. Outer wall of apothecium pale to bright yellow, smooth, the outer layer composed of parallel to slightly interwoven hyphae with thick refractive walls. Interascal tissue of filiform paraphyses 1-2 µm diam., somewhat swollen at the apex and ocntaining minute bright yellow oil globules. Asci 75-135 x 8-10 µm, cylindrical, the apex rounded, with a weakly blue-staining apical ring, 8-spored. Ascospores arranged obliquely uniseriately to biseriately, 9-14 x 3-5 µm, ellipsoidal, hyaline, sometimes eventually becoming 1-septate, thin-walled, smooth, without a gelatinous sheath.

Description adapted in part from Dennis (1956).