Myxarium nucleatum

On fallen branches of deciduous trees in autumn, with gelatinous, cerebriform fruiting bodies, translucent to whitish, up to 5–6 cm long, bearing characteristic small white calcium oxalate inclusions (nuclei) embedded in the gelatinous mass.

Context hyphae hyaline, thin-walled, only 1–3 µm wide, abundantly branched, embedded in a gelatinous matrix, septate, with clamp connections at the septa.

Basidia (phragmobasidia) ovoid to ellipsoidal, cruciately septate, measuring 10–16 µm long by 8–11 µm wide, 4-spored, with four stout, sinuous cylindrical sterigmata (epibasidia) up to 45 µm long.

Spores allantoid, smooth, hyaline, thin-walled, with a pointed lateral apiculus, measuring 10–14 µm long by 4–5 µm wide, containing oil droplets of varying size inside, inamyloid in Melzer's reagent.