SUMMARYRussula sect. Compactae subsect. Lactarioideae contains ten accepted species which may be distinguished on the basis of size of the pileus, taste and odor of the trama, spacing of the lamellae, and color, size, and ornamentation of the spores. Taxa described for the first time are R. inopina, R. cascadensis, R. romagnesiana, R. brevipes var. acrior, and R. b. var. megaspora.
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Robert Shaffer (1964) studied this question.
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