Porpidia nadvornikiana is a rare species of saxicolous (rock-dwelling), crustose lichen in the family Lecideaceae.

This lichen was found growing on serpentine rocks known locally as "Vysoký kámen", situated above the village of Raškov.

[5] A second locality of the lichen was reported in 1999, after it was discovered in sierra del Careón [es] (Galicia, Spain), growing on serpentinized peridotites that are part of the Melide geological complex.

These protrusions contain a web-like (arachnoid) medulla and sometimes open up, releasing their contents and leaving behind a circular scar upon their removal.

[6] The apothecia (fruiting bodies) of Porpidia nadvornikiana are distinguished by their black colour and sizes ranging from 0.8 to 0.9 mm in diameter.