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

BOLETUS

233

2536, W-288. Oakland: Smith 18537, 64255. Luce: Beach 138; Shaffer
1580; Smith 37080, 37170, 37257, 37441, 37796, 39280, 42296,
42469, 42624; Thiers 3027, 3137, 3855, 3868, 4059, 4100, 4353.
Washtenaw: Kauffman 7-29-27; Thiers 4557.
Stirps ROXANAE
KEY
1. Pleurocystidia 38-70 (100) x 9-16,t, content dark brown in Melzer's,
yellow in water mounts or in KOH.................... B. auriporus
1. Pleurocystidia smaller, not dark brown or red in Melzer's............. 2
2. Pileus ferruginous (rusty red)......................B. roxanae
2. Pileus olive to pale tan............................. 3
3. Pileus olive to honey-yellow.........(see B. minutiporus also) B. mariae
3. Pileus pale tan ("cinnamon-buff')..................B. subilludens
119. Boletus auriporus Peck
Rept. N. Y. State Cab. 23:133. 1872
Suillus auriporus (Peck) Kuntze, Rev. Gen. P1. 3(2):595. 1898.
Ceriomyces auriporus (Peck) Murrill, Mycologia 1:147. 1909.
Xerocomus auriporus (Peck) Singer, Rev. de Mycol. 5:6. 1940.
Pulveroboletus auriporus (Peck) Singer, Amer. Midi. Nat. 37:13. 1947.
Pileus 3-7 cm broad, convex becoming plane or the margin uplifted in age; surface dry and subpruinose at first, matted-fibrillose under
a lens, viscid when wet, color varying from "tawny-olive" to dull reddish
brown, when young often flushed ochraceous, surface sometimes areolate in age, when dried the pileus pale drab to dull cinnamon. Context
pale yellow, 5-8 mm deep, unchanging when cut; odor none; taste
slightly acid to mild.
Tubes 3-5 mm deep, (10 mm-Coker and Beers), adnate then depressed or with decurrent lines, "lemon-chrome" and remaining a bright
yellow in drying, unchanging when cut or bruised; pores 2-3 per mm at
first but widening in large caps to 1-2.5 mm wide near stipe in age.
Stipe 3-6 cm long, 1-1.2 (1.5) cm thick, equal or flared either
above or below (or both), solid, pale yellow becoming brownish and
darker below, staining near bister (dingy yellow-brown) when handled,
somewhat viscid when wet; surface thinly coated at first with a pale
lemon colored pruinosity, not at all reticulate (rarely so-Coker and
Beers).