Epiphytic species are still the least studied group of myxomycetes, because of their life cycle, substrate specialization and method of search using "moist chambers". The Russian's first records of the Physarum lakhanpalii Nann.-Bremek. et Y. Yamam. and Ph. lenticulare Nann.-Bremek. et Y. Yamam. with data on its localities, habitat, and distribution are provided. Ph. lakhanpalii is characterized by light yellow sporocarps, 0.5 mm wide and up to 10 mm long, two-layer peridium and spores, 11-12.5 µm, violaceous brown, adhering in clusters of mostly 4-6. Ph. lenticulare is characterized by gregarious sporocarps, total height 1 mm, sporotheca discoid to lenticular, black stalk, narrowed at the base, sometimes the stalks merge into 2-3 pieces, spores (9)10-11(14) µm, brown, warted and sometimes with clusters of more prominent warts. The revised description of Ph. lakhanpalii and Ph. lenticulare is given in the paper. We present micrographs in SEM for studied species, for Ph. lenticulare they presented for the first time. Ph. lenticulare is one of the rarest species of myxomycetes in the world, previously it was found only in Belgium, France, Netherlands and Japan. Most of the Physarum species in Asian part of Russia are recorded in Novosibirsk Region and currently the genus includes 29 species.