Extract from Wikipedia article: Cyathus striatus, commonly known as the fluted bird's nest, is a common saprobic bird's nest fungus with a widespread distribution throughout temperate regions of the world. This fungus resembles a miniature bird's nest with numerous tiny "eggs"; the eggs, or peridioles, are actually lens-shaped bodies that contain spores. C. striatus can be distinguished from most other bird's nest fungi by its hairy exterior and grooved (striated) inner walls. Although most frequently found growing on dead wood in open forests, it also grows on wood chip mulch in urban areas. The fruiting bodies are encountered from summer until early winter. The color and size of this species can vary somewhat, but they are typically less than a centimeter wide and tall, and grey or brown in color. Another common name given to C. striatus, splash cups, alludes to the method of spore dispersal: the sides of the cup are angled such that falling drops of water can dislodge the peridioles and eject them from the cup. The specific epithet is derived from the Latin stria, meaning "with fine ridges or grooves".
Fluted bird's nest mushroom (Cyathus striatus) on a mossy stump in Sosnovka Park. Saint Petersburg, Russia, March 23, 2017 Svetlanovskiy pr., 49, Sankt-Peterburg, Russia
Fluted bird's nest mushrooms (Cyathus striatus) on the edge of a stump in Sosnovka Park. Saint Petersburg, Russia, March 23, 2017 Svetlanovskiy pr., 49, Sankt-Peterburg, Russia
Fluted bird's nest mushrooms (Cyathus striatus) taken from Sosnovka Park. Saint Petersburg, Russia, March 23, 2017 pr. Raevskogo, 22, Sankt-Peterburg, Russia, 194064
Fluted bird's nest mushrooms (Cyathus striatus) on mulch in Sosnovka Park. Saint Petersburg, Russia, July 19, 2017 Unnamed Road, Sankt-Peterburg, Russia
Immature fluted bird's nest mushrooms (Cyathus striatus) on mulch in Sosnovka Park. Saint Petersburg, Russia, July 19, 2017 Unnamed Road, Sankt-Peterburg, Russia
Young fluted bird's nest mushrooms (Cyathus striatus) on a twig in Sosnovka Park. Saint Petersburg, Russia, July 24, 2017 Unnamed Road, Sankt-Peterburg, Russia
Immature fluted bird's nest mushrooms (Cyathus striatus) on a twig in Sosnovka Park. Saint Petersburg, Russia, July 24, 2017 Unnamed Road, Sankt-Peterburg, Russia
Fluted bird's nest fungus (Cyathus striatus) in Tarkhovka near Sestroretsk. West from Saint Petersburg, Russia, August 15, 2017 Unnamed Road, Sankt-Peterburg, Russia, 197701
Fluted bird's nest fungus (Cyathus striatus) in Blizhnie Dubki area near Lisiy Nos, west from Saint Petersburg. Russia, September 26, 2017 Polyanskaya Doroga, Sankt-Peterburg, Russia, 197755
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