The boletes of Michigan, by Alexander H. Smith and Harry D. Thiers.

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Figs. 48-58: fig. 48, spores of Tylopilus subpunctipes; fig. 49, terminal cell
from cuticle of same; fig. 50, pleurocystidia of Boletus chrysenteron var. sphagnorum; fig. 51, end-cells of cuticular elements of same; fig. 52, spores of Tylopilus
badiceps; fig. 53, spores of B. chrysenteron var. sphagnorum; fig. 54, pleurocystidia
of T. badiceps; fig. 55, cheilocystidia of same; fig. 56, caulocystidia of Leccinum
atrostipitatum; figs. 57-58, spores of same.