Poznámka k výskytu Porpidia nadvornikiana v České republice

Porpidia nadvornikiana (Vězda) Hertel is a poorly known lichen of serpentine rocks. It is presently known from three localities in the Czech Republic. Two of them are reported herein in addition to the two previously published records from the type locality. Possible threat status of the species in the Czech Republic is hypothesized.