Abstract:The lichenized fungi genus Reimnitzia Kalb (Graphidaceae) is reported as new record to China. It is a monotypic genus, containing the single species R. santensis epiphytic on bark or bryophytes. Reimnitzia santensis is crustose; has no cortex structures; contains large columns of calcium oxalate crystals; has abundant isidia, which are concolorous to thallus, unbranched, first globular, then worm-like, with a length of up to 1.5 mm, and a black pore area or a single pore at the top. The species has chroodiscoid ascomata, brown submuriform ascospores sized 15-25 μm×8-12 μm, and pycnidia that occur on the tips of isidia-like structures and in thallus warts, with bacilliform conidia, and abscence of lichen compounds.