Indigo Milk Cap ((top)) May 2026

He, M. Q., et al. (2019). "The genus Lactarius in China: a review." Mycological Progress , 18(5), 621–643.

Metzler, S., & Metzler, V. (1992). Texas Mushrooms: A Field Guide . University of Texas Press.

Harmaja, H. (2002). "Notes on the blue latex of Lactarius indigo and some related species." Karstenia , 42(1), 21–24. indigo milk cap

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.

Hesseltine, C. W. (1960). "The blue milk mushroom." Mycologia , 52(3), 482–484. "The genus Lactarius in China: a review

Bessette, A. E., Bessette, A. R., & Fischer, D. W. (1997). Mushrooms of Northeastern North America . Syracuse University Press.

Lactarius indigo , commonly known as the Indigo Milk Cap, is a strikingly pigmented basidiomycete fungus belonging to the family Russulaceae. Distinguished by its deep blue coloration and the production of a characteristic blue latex, this species is among the most recognizable wild fungi in North America, East Asia, and Central America. This paper provides a holistic review of L. indigo , covering its taxonomic classification, detailed morphological features, symbiotic ectomycorrhizal associations, geographic distribution, chemical basis of its pigmentation, and its status as an edible wild mushroom. The review concludes with an assessment of its culinary value and potential for commercial cultivation. Texas Mushrooms: A Field Guide

Ruan-Soto, F., et al. (2006). " Lactarius indigo (Schwein.) Fr. (Russulaceae): an edible mushroom used by the Ch'ol people of Palenque, Chiapas, Mexico." Economic Botany , 60(4), 345–354.