Xylobolus frustulatus

Common Names: Ceramic fungus, ceramic parchment
Category: Fungi
Sub-category: Crust Fungus

The fruit body forms small, hard, flat crust-like aggregations that resemble broken pieces of ceramic tile. Can also resemble corn-on-the-cob patterns, or look like molar teeth. Can be mistaken for a lichen. The fruit body, or crust has a woody texture and is perennial. It is mostly 1 to 2 mm thick, although it can be considerably thicker. The crust is frustose (cracking into small, angular polygons), and infrequently curled at the edges. The upper surface is zonate (appearing to have multiple zones of color or texture), and more or less smooth. The hymenial surface is smooth to the naked eye, although long soft hairs can be seen when viewed with a microscope.

The fungus is saprobic, and grows only on well-rotted wood of oak. It occurs on branches and trunks lying on the ground, and is more rarely seen on branches that are still attached to the tree.

Edible Notes: Not edible. Woody, tough.
Warnings: Not known to be dangerous.