BOLETI OF THE UNITED STATES. 83 
bous, pulverulent, lacerated or reticulated or the mouths of 
the tubes differently colored. In most species the viscid 
pellicle is separable from the flesh, which is often, in mature 
plants, of a soft and almost floccose or cottony texture. 
The tubes are generally adnate or even slightly decurrent. 
In the latter case the extreme top of the stem may be 
marked or slightly reticulated by the decurrent walls of the 
tubes. In rare instances the hymenium may be slightly 
depressed or sinuate around the stem. In some the color 
of the wounded tubes changes slightly, but in rare instances 
only does it become blue. The mouths of the tubes are 
often angular and the edges of the dissepiments dentate or 
uneven. Yellow or ochraceous hues prevail, but the young 
tubes are usually paler than the mature ones. The stem 
in some species is annulate, in others exannulate. In sev- 
eral closely allied central species of the tribe it, as well as 
the tubes, exudes drops of a thick gummy or turbid fluid 
which soon hardens, becomes darker in color and forms 
granules or glandular dots. I have not observed this char- 
acter in the species of any other tribe. 
The color of the spores as shown when shed upon white 
paper is some shade of yellow or ochraceous, ferruginous 
or brown. Several of the species have been recorded as 
edible. Nearly all of them occur in districts that now are, 
or formerly were inhabited by pine or other coniferous trees, 
and are wanting or scarce in other localities. 
The first four and several of the final species here 
described recede somewhat from the character of the cen- 
tral or typical species of the group. 
SLeMawat heayaminull Sse es ee Matis mieten otic tas I 
SHSiaa WHOLE Gun. BOMBINGS soe aaeoanaeeoecee anon Gos 9 
1. Stem dotted both above and below the annulus....... 2 
Im SLemedoOtbed above tie ann@liss sas 55.) as ees el. 3 
1S SUSI MO COAG! hs Aa ae beng es edod Sano TENE aE cea 4 
DB, INNES SAllTNon CollOrn: hese seha toes Heer oaeneo ne me B. salmonicolor. 
2. Tubes yellowish...,.... pepe N ae ste, vpaia/a aoe sey aheiaes B. subluteus. 
8, Avoinralleis Gingiaelhy? \etICOREN LS Sa oo nol Sbae Bonu sae eo 6 B. flavidus. 
2) Annulus membranous, fusacious, . 2). 0:2. ..26 2-560 4-5 B. elegans, 
