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In this paper, the authors present modern microscopical studies for 28 type specimens of Russula species described by C.H. Peck, thereby completing the revision of all 44 Russula taxa described by this author and for which type specimens were available. Our results suggest that with eventual exception of R. granulata var. lepiotoides (a likely synonym of the type variety) and R. magnifica (a likely synonym of R. polyphylla), all other Russulas described by Peck correspond to well-defined North American taxa. Having been described more than one century ago, Peck's names represent the majority of the earliest described North American Russula species and our type revisions are therefore important both for nomenclatural aspects, as well as typification and identification purposes. All studied taxa are illustrated in detail and accompanied by notes including a short recapitulation of previous type revisions, as well as our own re-evalutation of their systematic position as a result of this study.

A short history to the study of Russula in the Western United States is provided and for the first time an exhaustive list of all 49 taxa described from this part of the country has been compiled. As a start to a revision of these species, a first series of four holotypes (one from California and three from the Pacific Northwest) have here been studied microscopically, resulting in some very substantial changes concerning species concept and consequent systematic placement. Russula flava var. pacifica appears unrelated to the type variety. It is therefore excluded as member of Integroidinae, subgen. Polychromidia, and deserves probably to be upgraded to species level within subgen. Russula. The Californian R. paxilloides is lectotypified and is a good member of subgen. Russula, but is closer to sect. Persicinae than to the white-spored Vinaceae as previously suggested. Russula maxima, widely accepted as a species of subsect. Subcompactinae (subgen. Heterophyllidia), certainly does not belong ther...

The types or authentic material of four members of Russula subsect. Maculatinae recognized by Romagnesi were studied: R. decipiens, R. decipiens var. vermiculata nom. inval., R. deceptiva and R. romagnesii. All studied specimens showed several similar micromorphological characters, particularly important one-celled pileocystidia, suggesting their close relationship. Based on the differences in spore ornamentation and terminal cells of hyphae in pileipellis near the cap margin, two morphotypes were recognized. The first one, represented by the neotypus of R. decipiens and authentic material of R. decipiens var. vermiculata nom. inval., has lower spore ornamentation with more numerous warts and apically constricted, terminal cells of hyphae in pileipellis as compared to the second morphotype represented by the holotypus of R. deceptiva and paratypus of R. romagnesii.