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

136 THE BOLETES OF MICHIGAN
Stirps AURANTIACUM
KEY
1. Pileus white to pallid or with only a flush of pink................. 2
1. Pileus more distinctly colored............................ 3
2. Pileus dull white at all stages.................. see L. broughii
2, Pileus pallid but with a flush of pink.......... L. vinaceo-pallidum
3. Stipe ornamentation black or blackish on button stages.............. 4
3. Stipe ornamentation pallid at first then gradually darkening........... 7
4. Pileus grayish brown to olive-buff................ L. ambiguum
4. Pileus with more red in the coloration.................... 5
5. Caulocystidia mostly with a caplike apical wall-thickening... see L. areolatum
5. Caulocystidia not as above.............................. 6
6. Context bright green with FeSO4..................................... (see L. testaceoscabrum also) L. pellstonianum
6. Context bluish gray with FeS04.............. L. atrostipitatum
7. Pileus ferruginous-red, many cuticular hyphae showing pigment globules
when mounted in Melzer's...................... L. aurantiacum
7. Pileus yellow to orange or rusty orange to orange-red, pigment globules
not forming in cuticular hyphae mounted in Melzer's or rarely an occasional globule present................................. 8
8. Pileus rusty orange to reddish brown; stipe ornamentation reddish at
first................................ L. subrobustum
8. Pileus yellow to orange or dull cinnamon-buff to tawny.......... 9
9. Pileus cinnamon-buff to pale tawny.........................10
9. Pileus yellow to orange or orange-red when young.................11
10. Pileus fibrillose-squamulose........ L. cinnamomeum var. fibrillosum
10. Pileus glabrous or only with minute squamules.................................. L. cinnamomeum var. cinnamomeum
11. Stipe viscid at base when young; spore deposit olive colored...... L. laetum
11. Not with both the above features..........................12
12. Laticiferous elements in hymenophoral trama violaceous-bister in
Melzer's; stipe ornamentation becoming black before hymenophore
matures............................... L. ochraceum
12. Stipe ornamentation very fine, becoming orange-brown and remaining this color a long time, finally blackish as basidiocarp ages........................................ L. pseudoinsigne
63. Leccinum vinaceo-pallidum Smith, Thiers, & Watling
Lloydia 31:265. 1968
Pileus 4-14 cm broad, convex becoming nearly plane, surface
appressed-squamulose to glabrous, dry at first but subviscid in age,