Fungal Specimen Collection and Microscopic Analysis

The specimens were collected from the provinces of Jinlin, Heilongjiang, and Gansu in North China. They were deposited in the herbaria of Beijing Forestry University (BJFC) and the Mycology Department of Jinlin Agriculture University (HMJAU). Samples were photographed when fresh in the field, and their habitats were recorded. Microscopic structures were discussed by Chen et al. (2020) (link), Fan et al. (2021) (link), and Zhou et al. (2022) (link). Special color terms were set by Anonymous (1969) and Petersen (1996) . A Nikon Digital Sight DS-L3 or Leica ICC50 HD camera (magnification ×1,000) was used to examine hand-cut sections of basidiomata, which were first treated with 5% KOH for a few minutes and then with 1% phloxine B (C₂₀H₄Br₄Cl₂K₂O₅). At least 30 basidiospores of each species were examined. The values were expressed as a mean with 5% of the measurements excluded from each end of the range, given in parentheses. Stalks were excluded for basidia measurement, and the hilar appendages were excluded for basidiospore measurement.
The following abbreviations are used in the descriptions: IKI, Melzer’s reagent; IKI−, neither amyloid nor dextrinoid; CB, cotton blue; CB−, acyanophilous in cotton blue; L, the arithmetic average of spore lengths; W, the arithmetic average of spore widths; Q, L/W ratio; and n (a/b), number of spores (a) measured from a given number (b) of specimens.