TUBE-BEARING FUNGI. 



181 



Boletus luteus Linn. (B. suhluteus Pk.) This species is widely dis- 

 tributed in Europe and America, and grows in sandy soil, in pine or 

 mixed woods or groves. The plants are 5-8 cm. high, the cap 3-12 

 cm. in diameter, and the stem 6-10 mm. in thickness. The general 

 color is dull brown or yel- 

 lowish brown, and the 

 plants are slimy in moist 

 weather, the stem and 

 tubes more or less dotted 

 with dark points. These 

 characters vary greatly 

 under different condi- 

 tions, and the fact has led 

 to some confusion in the 

 discrimination of species. 



The pileus is convex, 

 becoming nearly plane, 

 viscid or glutinous when 

 moist, dull yellowish to 

 reddish brown, some- 

 times with the color ir- 

 regularly distributed in 

 streaks. The flesh is 

 whitish or dull yellowish. 

 The tube surface is plane 

 or convex, the tubes set 

 squarely against the stem 

 (adnate), while the tubes 

 are small, with small, 

 nearly rounded, or 

 slightly angular mouths. 

 The color of the tubes is 

 yellowish or ochre col- 

 ored, becoming darker in _ 

 age, and sometimes J 



nearly brown or quite f- # . 



dark. The stem is pale 



yellowish, reddish or brownish, and more or less covered with 

 glandular dots, which when dry give a black dotted appearance to 

 the stem. In the case of descriptions of B. luteus the stem is said 

 to be dotted only above the annulus, while the description of B. 

 subluteus gives the stem as dotted both above and below the annulus. 



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