BEPOET OF THE STATE BOTANIST 195 



1 Stem destitute of a collar B. granulatus. 



2 Stem dotted above the collar B. luteus, 



2 Stem dotted both above and below the collar B. subluteus. 



3 Stem rough with prominent colored dots 4 



3 Stem with no dots g 



4 Margin of the cap adorned with adhering fragments 



of a membranous veil B. versipellis. 



4 Margin of the cap naked '. . B. scaber. 



5 Stem solid , B. edulis. 



6 Stem hollow or cavernous B. castaneus. 



Boletus luteus L. 

 Yellow-beown Bolet08. 



Plate 33. Figs. 7 to 12. 



Pileus viscid or glutinous, dingy or brownish-yellow, somewnat 

 variegated with darker lines, spots or streaks, flesn white, some- 

 times tinged with yellow ; tubes minute, yellow, becoming darker 

 or ochraceous-yellow with age ; stem short, stout, annulate, yel- 

 lowish and dotted above the membranous annulus ; spores yellow- 

 ish brown, .00025 to .0003 in. long. 



The Yellow-brown boletus is one of our rarest tungi. Its 

 broadly convex or nearly flat cap is of a peculiar dingy color 

 formed by a mixture of yellow and brown or reddish-brown, 

 which is very obscurely varied by slightly deeper colored streaks 

 or spots. When wet it is covered with a sticky gluten which is 

 so tenacious that it can be peeled away with the cuticle. The 

 flesh is white, but in mature plants it is sometimes tinged with 

 yellow. The tubes are nearly plane in the young plant, that is, 

 their mouths are in a plane surface. They are at first concealed 

 by the white membranous veil which soon breaks from its 

 attachment to the margin of the cap and shrinks to the stem, on 

 which it forms a kind of collar. The young tubes are yellow, but 

 they assume dingy ochraceous hues with age. 



The stem is generally shorter than the horizontal diameter of 

 the cap. It is yellowish above the collar and marked there with 

 small brown dots. Below the collar it is generally more or less 

 covered by a continuation of the veil, so that in very short- 

 stemmed plants it appears as if sheathed by a wrapper as in the 

 genus Amanita. 



