Family 6. BOLETACEAE 
By WILLIAM ALPHONSO MURRILIL 
Hymenophore annual, nearly always terrestrial and centrally stipitate: 
context fleshy ; hymenium poroid, fleshy, never gelatinous. 
Tube¥ not arranged in radiating rows (except in one or two species of Boletus). 
Spores hyaline, often becoming yellowish ; stem hollow, not reticulate. 1. GyROPORUS. 
Spores rosy or flesh-colored ; stem solid, usually reticulate. 2. TYLOPILUS. 
Spores ochraceous to brown or black. : 
Stipe neither glandular-dotted nor annulate. 
Mouths of tubes never uniformly red nor reddish-brown, tubes 
unicolorous. 3, CERIOMYCES. 
Mouths of tubes red or reddish-brown, tubes yellowish within. 4. SUILLELLUS. 
Stipe either glandular-dotted or annulate. 
Stipe glandular-dotted, exannulate. 5. ROSTKOVITES. 
Stipe annulate, glandular-dotted in some species. 
Spores ochraceous to yellowish-brown, smooth, usually oblong- 
ellipsoid. 
Sporophore not covered with a yellow powder. 
Pileus smooth, viscid. 6. BOLETUS. 
Pileus floccose-verrucose, dry. 7. BOLETELLUS. 
Sporophore covered with a conspicuous yellow powder. 8. PULVEROBOLETUS. 
Spores brownish-black, rough, subglobose. 9. STROBILOMYCES. 
Tubes arranged in radiating rows. 
Stipe exannulate. 0 
1 
10. BOLETINELLUS. 
Stipe annulate. 11. 
BOLETINUS, 
1. GYROPORUS Quél. Ench. Fung. 161. 1886. 
Suillus P. Karst. Bidr. Finl. Nat. Folk 37: 1. 1882. 
Hymenophore annual, terrestrial, centrally stipitate ; surface dry, minutely tomentose 
to floccose-squamose : context white, less compact than in most members of the family and 
therefore drying more readily; tubes free, small, cylindric, white, not covered with a 
veil: spores ellipsoid, smooth, white, at length pale-yellow: stipe soft and spongy within, 
usually becoming hollow. 
Type species, Gyroporus cyanescens (Buil.) Quél. 
Flesh white, quickly changing to blue when wounded; pileus grayish-yellow, 
floccose. 
Flesh white, unchangeable. 
1.6G. 
Pileus reddish-brown. 2. G. castaneus, 
Piledts pale-yellowish. 3. G. subalbellus. 
CV ANESEENRS. 
1. Gyroporus cyanescens (Bull.) Quél. Ench. Fung. 161. 1886. 
Boletus cyanescens Bull. Herb. Fr. £1. 369. 1787. 
Boletus constrictus Pers, Syn. Fung. 508. 1801. 
Leccinum constrictum §. F. Gray, Nat. Arr, Brit. Pl. 1: 647. 1821. 
Boletus lacteus Lév. Ann. Sci. Nat. III. 9: 124. 1848. 
Suillus cyanescens P, Karst. Bidr. Finl. Nat. Folk 37: 1. 1882. 
Pileus convex, gregarious at times, 6-12 cm. broad, 1.5 cm. or more thick; surface 
pale-tan with grayish-white background or slightly brownish, opaque, appressed-tomentose 
or tomentose-squamulose ; margin entire, concolorous, adorned in young plants with a dis- 
tinct cortina, which is a part of the general hairy covering : context white or grayish-white, 
sweet, 1 cm. or more thick, quickly changing to indigo-blue when wounded ; hymenium 
nearly plane, depressed near the stem; tubes free, short, about 4 mm. long, white to yel- 
lowish, quickly changing to indigo-blue when wounded, mouths circular, small, edges thin, 
entire: spores ellipsoid, smooth, hyaline to pale-yellowish, 9-11 X 5-6: stipe ventricose, 
VOLUME 9, Par? 3, 1910] 133 
