io8 BASTDIO^rYCETES 



none of the species are known to be injurious except B. felleiis, a 

 common species with brown pileus, reticulated stem, and flesh- 

 colored pores, whose bitter taste would prevent it from being used 

 as food. In this genus as everywhere among the fungi, unknown 

 species should be tested with caution and special care should be 

 taken to avoid specimens that are not strictly fresh and young. 

 Among the edible species we may mention the following as 

 well recommended : 



1. Bolcti ivith a viscid pileus. 



B. graiiiilatus is usually grayish yellow with pale yellow pores 

 and white flesh ; the mouths of the tubes are dotted with minute 

 brownish granules from which the specific name is derived. 



B. luteics has a yellowish-brown pileus, Avith minute yellow 

 pores and whitish or slightly yellowish flesh; the stem has an an- 

 nulus above which it is yellowish with small brown dots. It is 

 not a common species. The pileus is from two to five inches 

 across and the stem is scarcely two inches long. 



B. sitbluteus has a dingy yellowish-brown pileus and with a 

 Avhitish or dingy yellowish stem which is marked by brown dots 

 both above and below the annulus. It is slightly smaller than 

 the last-named species and has a more slender stem. 



2. Boleti ivith a dry pileus. 



B. scaber is easily recognized by its whitish pores and its long 

 stem which is roughened by small brownish or blackish scales. 

 The pileus is variable in color, ranging from nearly white to 

 almost black, and is from two to five inches across with a stem 

 from three to six inches long. It is a very common species. 



B. edulis has a grayish red or brownish pileus, and its whitish 

 flesh is tinged with reddish just beneath the cuticle; the pores are 

 whitish at first and become greenish yellow with age. The pileus 

 is four to six inches across and the stem is from two to six inches 

 long, and is marked by a network of raised lines just beneath the 

 layer of pores. 



B. castajieus has a dull reddish or cinnamon-colored pileus, 

 shallow pores which are whitish at first and then yellowish, and a 

 hollow stem in color not unlike the pileus. 



B. versipellis has a yellowish-red pileus two to six inches 

 across, long small pores which are grayish-white becoming dingy 

 with age ; its veil frequently clings in torn fragments to the mar- 



