30 NORTHERN POLYPORES 



i. GRIFOLA FLAVOVIRENS (Berk. & Rav.) Murrill, comb. nov. 



Pileus at first simple and centrally stipitate, becoming imbri- 

 cate-multiplex when fully developed, 8-20 cm. in diameter; 

 pileoli soft, fleshy, fragile when dry, circular to flabelliform, 

 pulvinate or depressed to applanate, 5-10 cm. broad, 5-8 mm. 

 thick; surface sordid-yellow, with yellowish-green zones, be- 

 coming dull-yellowish-green, finely tomentose to subglabrous; 

 margin irregular, undulate to lobed, concolorous; context fleshy, 

 very fragile when dry, 2-4 mm. thick, white to yellowish; tubes 

 very decurrent, yellow to yellowish-green, 3-5 mm. long, mouths 

 irregular, circular to sinuous, 1-2 to a mm., at first milk-white, 

 becoming dirty-yellow, edges thin, fragile, lacerate with age; 

 spores subglobose, smooth, 3-4.5 M; stipe central or eccentric, 

 pallid, 3-6 cm. long, 1-1.5 cm - thick, becoming tubercular and 

 connate-ramose at maturity. 



Frequent on the ground in woods throughout the eastern 

 United States westward to Missouri. Very near P. cristatus of 

 Europe. Grifola poripes (Fries) Murrill is distinct and doubtful. 



2. GRIFOLA SUMSTINEI Murrill 



A very large plant resembling G.frondosa in habit and general 

 appearance, but with fewer and broader pileoli, darker surface, 

 and darker hymenium. Pileus imbricate-multiplex, 20 X 30 

 cm.; pileoli flabelliform to spatulate, 6-8 X 6-8 X 0.3-0.5 cm.; 

 surface radiate-rugose, finely tomentose, light- to dark-brown; 

 margin very thin, fissured and strongly inflexed when dry; con- 

 text white, fibrous, fleshy-tough to almost leathery, 0.3 cm. 

 thick; tubes 0.2 cm. long, 7 to a mm., at first fuliginous, becoming 

 pallid at maturity, polygonal, irregular, edges very thin and 

 fragile, becoming lacerate; spores globose, smooth, copious, 

 5 n; stipe tubercular, woody, blackish below, connate-ramose, 

 lighter-colored, passing insensibly into the pileoli above. 



Occasional about old stumps and trunks of deciduous trees 

 from New York to Missouri and southward. P. giganteus of 

 Europe is very similar in appearance. 



3. GRIFOLA FRONDOSA (Dicks.) S. F. Gray 



Pileus imbricate-multiplex, 15-40 cm. in diameter; pileoli very 

 numerous, branching from a common trunk, imbricate or con- 

 fluent, variable in size and shape, dimidiate to flabelliform, 1 .5-6 

 cm. broad; surface smoky-gray, fibrillose, radiate-striate ; margin 

 thin, undulate or lobed, strongly inflexed when dry; context 

 white, very thin, tough, fragile, having the odor of mice; tubes 



