See text Cryptothecia is a genus of white to greenish crustose lichens that grow on bark, wood, or leaves, in tropical or subtropical areas worldwide.

[3] The main vegetative body (thallus) lacks a cortex (ecorticate and is often immersed in the substrate or byssoid (whispy, like teased wool).

[2] Ascomata are not well defined, being cushions of soft white mycelium immersed in the medullary tissue, hence the name from the Greek krypto = "to conceal" and theke = "a container or sheath".

The medulla is usually well-defined, white, and frequently amyloid, often containing numerous colourless calcium oxalate crystals.

Its ascigerous areas, which can be common or rare, are restricted to cushions of soft white mycelium within the loose medullary tissue.