88 MINNESOTA MUSHROOMS 



(a) Cap black or blackish; taste mild B. nigri-l/i<s 



(b) Cap 3-ellowish to brown or chestnut ; taste bitter B. iillcus 

 (2) Tubes not flesh-colored, free; cap reddish or 



brownish, smooth B. cdulis 



b. Stem without net-like veins 



( 1 ) Cap sticky when moist 



(a) Tubes adnate, yellow 



X. Stem dotted above the large ring B. luteus 



y. Stem dotted above and below the sticky ring B. siiblutcus 



(b) Tubes free, whitish or grayish; stem rough- 



scaly B. scabcr 



(2) Cap not sticky when moist 



(a) Stem spongy, then more or less hollow; flesh 



blue where bruised B. cxanescens 



(b) Stem solid 



X. Tubes changing to blue where bruised, adnate 



(x) Cap and stem whitish or brownish white B. pallid us 



(y) Cap dark red; stem red, yellow above B. bicolor 



y. Tubes not changing to blue, free ; cap orange- 

 red B. vcrsipcUis 



Boletus vermiculosus Scaly Boletus 



Cap 6-12 cm. wide, vellowish or reddish brown, more or less rough hairv or 

 scalv. sometimes smooth, dry. convex, flesh whitish, turning blue where bruised ; 

 stem 5-10 cm. bv 1-2 cm., yellowish, nearlv smooth, solid; tubes nearlv free, 

 vellowish. mouths brownish orange, then blackish, changing to blue when bruised ; 

 spores vellow-brown. elliptic, 10-12 X -'■-5/t. The name has no evident appilication. 



(Jn the ground in woods, summer and autumn ; not tested. 



Boletus luridus Lurid Boletus 



Cap 5-10 cm. wide, olive-brown to sootv. somewhat stickv. more or less hairy, 

 convex; flesh yellow, turning blue where bruised; stem 5-S cm. bv 1-2 cm., 

 bright red or vermilion, orange above, netted or dotted, solid ; tubes free, vellow. 

 then greenish, mouths red. then orange ; spores greenish, elliptic, 1 5 X 9/i. The 

 name refers to the color. 



On the ground in leaf mold, sunmier and autmnn. This species is of bad repute, 

 but Mcllvaine has eaten it and calls it delicious. It should be most carefully tried 

 bv the beginner. 



Boletus nigrellus Black Boletus 



C a p 7-15 cm. wide, blackish, dry. smooth or nearly so. con\'ex to plane ; flesh 

 white, unchanging; stem 3-6 cm. by 1-2 cm., blackish or paler than the cap. 



