Bacidina mendax

The type specimen was collected by the first author between Lúka village and Tematísky hrad Castle (Považský Inovec, Slovakia) at an elevation of about 230 m (750 ft); there, it was growing on a roadside Acer platanoides tree.

Collections of this species were stored in several European herbaria, but they had typically been misidentified as morphs of B. caligans, B. neosquamulosa, B. phacodes, or B. delicata.

The photobiont partner of the lichen is chlorococcoid (i.e., green algae from the family Chlorococcaceae), with roughly spherical cells measuring up to 17 μm in diameter.

The apothecia (spore-bearing structures) range in colour from whitish and flesh-coloured throughout, to beige, to pinkish-buff, to brownish; they are 0.2–0.7 mm in diameter with a constricted base.

Countries in which it has been verifiably documented are Czech Republic, Great Britain, Poland, Slovakia, and Ukraine.