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

LECCINUM

163

79a. Leccinum insolens var. brunneo-maculatum Smith,
Thiers, & Watling
Lloydia 31:259. 1968
Pileus 7-9 cm broad, convex becoming broadly convex, the margin
appendiculate with segments of the sterile margin which extends beyond
the tubes, surface dry and minutely fibrillose-squamulose at first, subviscid and glabrescent in age; color whitish to "pale pinkish buff," the
squamules dingy cinnamon-buff, staining dull brown where injured. Context white, slowly staining bluish fuscous (no preliminary reddish stage
evident), odor and taste mild; with FeSO4 bluish on the context.
Tubes white, depressed around the stipe at maturity becoming
avellaneous to wood-brown; pores minute, white, staining dingy yellowbrown when bruised and the injured portions finally avellaneous or
darker.
Stipe 8-13 cm long, 1-2.5 cm thick at apex, narrowly clavate,
solid, white within, staining violaceous-fuscous, in some staining blue
near base also; surface dull white with darker brown points and dots
from near base to apex.
Spore deposit olive-brown moist, near bister as air-dried; spores
12-15 X 4-5 g, smooth, wall about 0.2 pj thick, lacking an apical pore;
shape in face view subovate, in profile elongate-inequilateral, ochraceous
to pale ochraceous-brown in KOH, in Melzer's weakly dextrinoid to
yellowish.
Basidia 22-30 X 8-10 #u, 4-spored, clavate, hyaline in KOH. Pleurocystidia scattered, 32-46 X 8-14,, narrowly to broadly fusoid-ventricose, neck elongated and apex acute to subacute, content smoky brown
to hyaline in either KOH or Melzer's, wall thin and smooth. Cheilocystidia more or less similar to pleurocystidia but smaller and a larger
number with colored content. Caulocystidia mostly clavate-mucronate to
fusoid-ventricose, 36-50 X 9-15 i, few large clavate to saccate-pedicellate cells also present, content brownish ochraceous in KOH; subiculum
hyphae lacking refractive lens-shaped bodies on the interior walls.
Tube trama typical of the section (weakly bilateral). Some laticiferous elements present. Pileus cutis of appressed hyphae many 10-18,
wide and with some short cells in many of the hyphae, these cells rarely
almost sphaerocyst-like, their walls ornamented by small plates of material as in L. insigne, the end-cells often short and bullet-shaped, content
pale dingy brownish in KOH, in Melzer's becoming granular or rarely a
few globules present but formation of globules not constant or characteristic, after standing for 15 minutes some hyphae filled with minute