[Vor. 1 
114 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
rise to from 2 to 4 pileoli, sometimes simple with but one large 
pileus; pileoli fleshy-tough when fresh, becoming rigid on drying, 
more or less cireular in outline, 6-15 сіп. broad, 0.3-1.5 em. 
thick, light colored, whitish to yellowish, slightly tomentose 
or glabrous, azonate or obscurely zoned; margin rather thin, 
often lobed; context white, fleshy-tough, fragile when dry, 
0.3-2 cm. thick; tubes 2-8 mm. long, decurrent on the stipe; 
mouths white or whitish, large and irregular, averaging 0.5-2 
mm. in diameter; stipe short and thick, more or less tubercular, 
whitish in color, 4-7 em. long, 3-5 cm. thick; spores white, 
minutely echinulate, globose, 5.6-8.4 шіп diameter. 
Growing at the bases of trees and stumps, especially of Quercus. 
Frequent. 
This is one of the largest of our species and is easily distin- 
guished from all of its allies by the echinulate spores. Morgan’s 
description of P. апат Berk. applies to P. frondosus Fries and 
not to P. Berkeleyi for which Р. апат is a synonym. (See 
Lloyd, Mycological Notes 27: 341-342.) Тһе plant is well 
represented by the following illustrations: Lloyd, Photogr. 
pl. 9-10; Мус. Notes Polyp. Iss. 3: f. 362-63., and Hard, 
Mushrooms f. 323 and рі. 45. 
42. P. sulphureus Bull. ex Fries, Syst. Myc. 1: 357. 1821. 
Boletus sulphureus Bul. Herb. Fr. pl. 429. 1788. P. 
cincinnatus Morgan, Jour. Cine. бос. Nat. Hist. 8: 97. 1885. 
Plants annual, often attenuate at the base and appearing 
substipitate, imbricate; pileus dimidiate to flabelliform in 
outline, 5-20 x 4-12 x 0.5-2.5 cm., fleshy and watery when 
young, becoming firm when old, yellowish to bright orange- 
colored, sometimes fading with age, finely tomentose to gla- 
brous, azonate or with broad colored zones, the margin thin 
and acute, sometimes lobed; context white or light yellow, 
fleshy when fresh, rather soft and friable when dry, 0.4-2 cm. 
thick; tubes 1-4 mm. long, the mouths bright sulphur-yellow, 
sometimes whitish or dull yellow with age or on drying, angular, 
averaging 2-4 to a mm.; spores white, smooth, ovoid to sub- 
globose, 4-5 x 5.5-7 и. 
Growing оп trunks and stumps of deciduous trees. Common. 
Specimens usually change color on drying and most of the 
red color of the pileus is lost. Тһе bright yellow of the hyme- 
