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Parasitic on Russula and Lactarius species (Harrison & Grund 1977), particularly members of the R. brevipes species complex (Laperriere et al. 2018). Found in mixed hardwood forest. Reddish orange subiculum forms a powdery coating on its host mushroom, deforming the shape of the pileus and covering the gills completely. Some specimens within the same patch displayed a white subiculum. Rogerson & Samuels (1994) delineate the white form as Hypomyces macrosporus based on a negative KOH reaction on the white parts compared to a purple KOH reaction on the red form, while Harrison & Grund (1977) label both forms as H. lactifluorum based on microscopic characters. Further research is needed to determine if these different phenotypes constitute separate species. ID number: 20.23.04.2021
White, Kathleen R.; Jergensen, Jacqueline A.; and Lam, Ada, "Hypomyces lactifluorum" (2021). Mycological Herbarium of Macrofungi from the East Brook Valley. 48.
Location: East Brook Valley, Walton, NY (BC - Betula Creek)