Scytinostroma portentosum

On decaying ground wood, with completely resupinate basidiomes up to 1 mm thick, cream-colored, smooth surface, waxy in appearance, with a well-delimited growing margin.

Hyphal system dimitic, with thick-walled skeletal hyphae very abundant in the subiculum, 1.5 to 2 µm wide, branching to form dendrohyphidia in the hymenium; and scarce generative hyphae, very difficult to find, hyaline, thin-walled, 2 to 4 µm wide, septate and without clamp connections.

Cystidia scarce, fusiform, hyaline, thin- to moderately thick-walled, 40 to 60 µm long and 4 to 5 µm wide.

Basidia subcylindrical, 40 to 50 µm long, 4 to 5 µm wide, simple-based and four-spored.

Spores globose to subglobose, smooth, hyaline, slightly thick-walled, 5.5 to 6.5 µm long, 5 to 6.2 µm wide, containing oil droplets inside, and amyloid in Melzer's reagent.