Cryptostroma corticale

Cryp·to·stro·ma cor·ti·ca·le

(krip'tō-strō'mă kōr'ti-kā'lē),
A species of fungus that is a common allergen, growing profusely under the bark of stacked maple logs; handlers who inhale the massive number of spores may develop pneumonitic as well as allergic reactions, including maple bark disease.
[crypto- + G. stroma, bed]

Cryptostroma corticale

A fungus found on the bark of maple and sycamore trees and on stored logs, which produces conidia measuring 4–6.5 x 3.5–4 microns. It causes extrinsic allergic alveolitis in maple bark stripper’s lung.