Twelve taxa (Absconditella lignicola, Aspicilia moenium, Bacidia viridescen
s, Bacidina arnoldiana, Lecanora dispersa, Lecidea variegatula, Macentina a
bscondita, Placynthiella dasaea, Psorotichia lutophila, Steinia geophana, S
trigula sychnogonoides, Verrucaria dolosa) are treated. Most are apophytic,
increasing under the influence of human activities. Many are also short-li
ved and complete their whole life cycle within a few months. Lecanora dispe
rsa is recorded from polystyrene and Strigula sychnogonoides from wooden ch
ipboards. Bacidia viridescens, Lecidea variegatula, Macentina abscondita an
d Psorotichia lutophila are new to Slovakia.