Name: Stropharia riparia
Author: A.H. Sm.
Citation: Michigan Bot. 18(3): 107 (1979)
Preferred Synonyms:Leratiomyces riparius (A.H. Smith) Redhead
Deprecated Synonyms: Stropharia magnivelaris sensu A.H. Sm. nom. inval.
In the publication on Strophariaceae by Noordeloos, he lakes a closer look again at the genera of Stropharia and Leratiomyces. Machiel Noordeloos, Strophariaceae s.l., in Fungi Europei vol. 13. 648 pp, 43 plates with line-drawings, and 377 colored photographs. Edizioni Candusso, 2011.
In this work he has new descriptions of L. percevalii and L. magnivelaris, which people have equated with S. riparia in the past. See, e.g, Kuo, M. (2009, February). Leratiomyces percevalii. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/leratiomyces_percevalii.html.
Here Noodeloos does not mention S. riparia at all, and separates the two Leratiomyces taxa on qualities of the veil. One can be left to assume that S. riparia should be considered a separate North American taxon, which should be moved to Leratiomyces at some point.
Stropharia riparia sensu A.H. Sm.: Original description available from: http://www.mykoweb.com/CAF/protologue/Stropharia_riparia.pdf