12 Murrill: Boletaceae of North America 



in Iowa and Minnesota, being found in low ravines and sandy 

 places in woods, and occasionally about stumps. The sheathing 

 annulus is very characteristic, as are the globose spores, both 

 characters being very rare among the Boletaceae. 



4. Boletus Clintonianus Peck, Ann. Rep. N. Y. State Mus. 

 23: 128. pi 5. /. 1-5. 1872 



Boletus viridarius Frost, Bull. Buffalo Soc. Nat. Hist. 2 : 100. 



1874. (Type from Vermont.) 

 Boletus serotinus Frost, Bull. Buffalo Soc. Nat. Hist. 2 : 100. 



1874. (Type from Vermont.) 



This rather rare species was described from North Elba, New 

 York, and is to be looked for in shaded grassy places in the 

 northeastern United States and Canada. I have collected it 

 twice in central Maine and once in Newfield,. New Jersey, the 

 latter collection being made as late as October 25. It is readily 

 distinguished from its congeners of the eastern United States 

 by the absence of glandular dots on the stem. 



7. Rostkovites Karst. Rev. Myc. 3 9 : 16. 1881 



Hymenophore annual, terrestrial, centrally stipitate; surface 

 viscid, glabrous or hirtellous : context fleshy, yellowish ; tubes 

 adnate, angular, yellow, not covered with a veil, exuding viscid 

 drops which blacken on drying: spores oblong-ellipsoid, smooth, 

 yellowish-brown : stipe solid, glandular-dotted, exannulate, not 

 reticulate. 



Type species, Rostkovites granulatus (L.) Karst. 



Pileus glabrous or nearly so. 



Pileus brown when moist, yellowish on drying; stem 



over 8 mm. in diameter. 1. R. granulatus. 



Pileus yellow, often streaked with bright red ; stem 



usually slender, 8 mm. or less in diameter. 2. R. Americanus. 



Pileus adorned with conspicuous tufts of hairs. 3. R. hirtellus. 



i. Rostkovites granulatus (L.) Karst. Rev. Myc. 3 9 : 16. 



1881 



Boletus granulatus L. Sp. PI. 1177. 1753- 



Boletus circinans Pers. Tent. Disp. Meth. Fung. 27. 1797. 



Boletus lactifluus With. Arr. Brit. PL ed. 4. 4: 314. 1801. 



