Xerocomellus diffractus, commonly known as the cracked-cap bolete,[1] is a species of mushroom in the family Boletaceae.

[2] Xerocomellus diffractus was first unofficially described by Noah Siegel, Christian Schwarz, and Jonathan L. Frank in the book Mushrooms of the Redwood Coast in 2016.

[1][3] The cracks start out pale to whitish, and turn pinkish as the mushroom gets older.

However, X. amylosporus, X. mendocinensis, X. salicola, and X. rasisiae bruise blue quicker and more intensely, and X. chrysenteron is found in Europe.

[5] Xerocomellus diffractus is a mycorrhizal fungus, found growing under trees.