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Cincinnati Society of Natural History. 



In low, damp places in woods, in summer; rare. Pileus 3-4 in. 

 broad, stipe 3-4 in. long, and \ f of an inch thick. I found my speci- 

 mens in very dry weather,' and they were,. 1 quite firm and not infested 

 by the larvae of insects. In the younger specimens there is some red 

 on the stipe and within ; the pileus becomes thick and the pores change 

 to blackish as the plant grows old. 



Series II. — Tephroleuci. 



Tubules at first white or gray. 



D. Changing to brown. 



9. B. strobilaceus, Scop. — Blackish-umber. Pileus pulvinate, im- 

 bricated with thick floccose scales. Stipe equal, veiled, sulcate at the 

 apex. Tubules adnate; the pores large, angular, whitish-brown. 

 Spores blackish-brown, nearly gl obose, .010 — .013 mm. in diameter. 



On the ground in dry woods, in summer; common. Pileus 2-4 in. 

 broad, stipe 3-4 in. long, and |~f of an inch thick. In this species the 

 scales are imbricate, and the tubules are adnate by their whole length. 

 The flesh when cut or broken becomes reddish or blackish. 



10. B. floccopus, Vahl. — Cinereous, at length blackish. Pileus pul- 

 vinate, soft, covered with an areolate-fasciculate, scaly-squarrose to- 

 mentum; veil silky thick, annular-appendiculate. Stipe stout, umber- 

 tomentose below, lacunose above. Tubules abbreviated behind; the 

 pores large, white- gray. Spores blackish, nearly globose, .009 — .010 

 mm. in diameter. 



On the ground in dry woods, in summer; common. Pileus 3-5 in. 

 broad, the stipe 4-5 in. long, and f 1 in. thick. This species is distin- 

 guished by the tomentum raised into -thick, erect, pointed tufts, and 

 by the tubules being depressed around the stipe. These black Boleti 

 are abundant in our woods, and probably there is hardly enough dif- 

 ference between them to warrant two species. They seem to be scarce 

 in Europe; the}' are the Strobilomyces of Berkeley. 



B. Changing to sordid. 



11. B. scaber, Fr. — Pileus pulvinate, glabrous, viscid when wet, at 

 length rugulose or*rivulose; the margin at first curtained. Stipe solid 

 tapering upward, rough with fibrous scales. Tubules free, convex, 

 white then sordid; the pores minute, round. Spores pale brown, fusi- 

 form, .014— .015X.0055 mm. 



In hilly woods in summer; rare. Pileus 3-5 in. broad, the stipe 3-5 

 in. high, and £-1 in. thick. The few depauperate specimens 1 have 



