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

196 THE BOLETES OF MICHIGAN
KEY
1. Odor when fresh strongly raphanoid; pores staining rusty cinnamon when
bruised.................................... L. parvulum
1. Not as above....................................... 2
2. Spores 10-15 X 3.5-4.5 X; stipe becoming yellow over a considerable
portion especially in drying.................. L. flavostipitatum
2. Spores 5-7 #u wide............................. 3
3. Stipe apex staining pink or redder when cut......... (see L. snellii also) 4
3. Stipe apex unchanging when cut or slowly merely brownish.......... 6
4. Pileus coffee-brown to dark rusty brown; pileus cutis of hyphae
4-6 p/ wide and with numerous pigment globules when mounted in
Melzer's................................ L. coffeatum
4. Not as above.................................... 5
5. Pileus dull cinnamon young and darker cinnamon when mature; stipe
ornamentation fine and long remaining pallid............... L. pallidistipes
5. Pileus pale pinkish buff, becoming grayer; stipe ornamentation coarse...................................... L. rimulosum
6. Caulocystidia often proliferated at apex................. L. singeri
6. Caulocystidia not proliferated......................... 7
7. Stipe ornamentation fine, pallid becoming orange to cinnabar but finally
darkening-especially in drying................... L. subpulchripes
7. Stipe ornamentation over lower half coarse and soon blackish........................................... L. scabrum f. scabrum
97. Leccinum parvulum Smith, Thiers, & Watling
Mich. Bot. 6:135. 1967
Pileus 2.5-3.5 cm broad, obtuse, expanding to broadly umbonate,
viscid, pallid when very young, soon becoming pale tan (dull "pinkish
cinnamon" to "pinkish buff"), in some specimens pallid beneath minute
pinkish buff areolae and hence giving a somewhat mottled appearance
but some pilei remaining perfectly even. Context firm but soon soft,
white, unchanging when cut in young material, in old ones slowly
changing to near wood-brown, slowly and weakly olive with FeSO4,
with KOH slowly brownish; odor strong of radish but taste mild.
Tubes 1 cm deep, dull cinnamon when mature ("Sayal-brown"),
adnate at first, becoming nearly free from the stipe; pores minute, dull
cinnamon but staining rusty cinnamon where injured.
Stipe 6-8 cm long, 7-9 mm thick at apex, up to 12 mm at base,
with a napiform bulb (pointed), ornamented with dingy cinnamon scabrosities which do not darken much in age, solid, white within but
slowly becoming dingy wood-brown when cut.