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Among the approximately 400 species within the genus Lactarius , Lactarius indigo stands out due to its vivid, unmistakable indigo-blue color. First described by Lewis David de Schweinitz in 1822 as Agaricus indigo and later reclassified by Elias Magnus Fries, this species has captured the attention of mycologists, foragers, and naturalists alike. Unlike many Lactarius species that exhibit muted earth tones, L. indigo retains its blue hue from the early button stage through maturity, often turning a greenish-blue with age. This paper aims to synthesize existing knowledge on the species' biology, ecology, and practical uses.
Harmaja, H. (2002). "Notes on the blue latex of Lactarius indigo and some related species." Karstenia , 42(1), 21–24. indigo milk cap
Metzler, S., & Metzler, V. (1992). Texas Mushrooms: A Field Guide . University of Texas Press. Among the approximately 400 species within the genus
Hesseltine, C. W. (1960). "The blue milk mushroom." Mycologia , 52(3), 482–484. indigo retains its blue hue from the early
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