Slime mold Physarum virescens on rotten leaves in Dibuny, north-west from Saint Petersburg, Russia Leningrad Region, Russia, August 9, 2016
Unnamed Road, g. Sankt-Peterburg, Russia, 197758Synonyms: Didymium nectriiforme, Didymium sinapium, Lignydium virescens, Physarum caespitosum, Physarum ditmarii, Physarum theioteum.
Russian name: Fizarum zeleneiushchiy.
Physarum virescens is a species of slime mold belonging to the phylum Mycetozoa. It is characterized by its yellowish-green to dark green color and iridescent sheen on its sporangia. In St. Petersburg, Leningrad Oblast, and north-western Russia, Physarum virescens has been found in moist, shaded areas with rich organic matter, such as deciduous and mixed forests, as well as in urban environments like parks and gardens. It typically grows on decaying wood, leaf litter, and other plant debris, often forming extensive networks of vegetative stage. The species is relatively common in the region, with a wide distribution across various habitats.
Slime mold Physarum virescens on rotten leaves in Dibuny, north-west from Saint Petersburg, Russia Leningrad Region, Russia, August 9, 2016Unnamed Road, g. Sankt-Peterburg, Russia, 197758
Slime mold Physarum virescens on the ground. Oselki, south from Saint Petersburg, Russia, August 29, 2016Unnamed Road, Oselki, Leningradskaya oblast', Russia, 188665
Slime mold Physarum virescens on a rotting leaf in Kuzmolovo, north from Saint Petersburg. Russia, July 26, 2017Unnamed Road, Leningradskaya oblast', Russia, 188663
Slime mold Physarum virescens on pine needles in Sosnovka Park. Saint Petersburg, Russia, August 4, 2017Unnamed Road, Sankt-Peterburg, Russia, 194295
Close up of slime mold Physarum virescens on pine needles in Sosnovka Park. Saint Petersburg, Russia, August 4, 2017Unnamed Road, Sankt-Peterburg, Russia, 194295
Slime mold Physarum virescens on pine needles on the ground in pine forest in Sosnovka Park. Saint Petersburg, Russia, August 4, 2017Unnamed Road, Sankt-Peterburg, Russia, 194295
Slime mold Physarum virescens on pine litter in Sosnovka Park. Saint Petersburg, Russia, August 4, 2017Unnamed Road, Sankt-Peterburg, Russia, 194295
Slime mold Physarum virescens on moss and pine needles in Sosnovka Park. Saint Petersburg, Russia, August 4, 2017Unnamed Road, Sankt-Peterburg, Russia, 194295
Slime mold Physarum virescens in area of Kavgolovskoe Lake near Oselki - Toksovo, north from Saint Petersburg. Russia, August 9, 2017Novyy per., Kavgolovo, Leningradskaya oblast', Russia, 188667
Slime mold Physarum virescens in Kannelyarvi, 45 miles north from Saint Petersburg. Russia, August 11, 2017Unnamed Road, Kannelyarvi, Leningradskaya oblast', Russia, 188850
Slime mold Physarum virescens on moss in Kannelyarvi, 45 miles north from Saint Petersburg. Russia, August 11, 2017Unnamed Road, Kannelyarvi, Leningradskaya oblast', Russia, 188850
Mature slime mold Physarum virescens in Kannelyarvi, 45 miles north from Saint Petersburg. Russia, August 11, 2017Unnamed Road, Kannelyarvi, Leningradskaya oblast', Russia, 188850Observations of Physarum virescens in Leningrad Oblast and north-western Russia show that the species can be found on various substrates, including rotten leaves, pine needles, moss, and ground litter. In Dibuny, Oselki, Kuzmolovo, and Sosnovka Park, the slime mold was observed on rotting leaves and pine needles. In Sosnovka Park, it was also found on pine litter and moss. Similar observations were made in areas near Kavgolovskoe Lake, Toksovo, and Kannelyarvi, where the species was found on moss, pine needles, and ground surfaces. The slime mold was observed in different stages of maturity, with mature specimens found in Kannelyarvi. These findings suggest that Physarum virescens is widely distributed in the region and can thrive in various environments. The observations were made between July 2016 and August 2017, indicating a possible summer peak in activity.
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