1914) 
OVERHOLTS—THE POLYPORACE OF OHIO 113 
From P. Berkeleyi Fries and P. giganteus Fries this species 
is separated by the numerous small pileoli which in those species 
are large and few in number. Тһе irregular stipe-branches and 
the more spathulate pileoli separate it from Р. umbellatus 
Fries in which the stipe branches are cylindrical and the pileoli 
centrally attached and consequently more nearly circular in 
outline. The plant is illustrated in Atkinson, Mushrooms 
f. 181-82., Hard, Mushrooms f. 321., and МеПуаіпе, Am. 
Fungi pl. 128. 
40. P. giganteus Pers.ex Fries, Syst. Myc. 1: 356. 1821. 
Boletus giganteus Pers. Syn. Fung. 521. 1801. Grifola Sums- 
tinei Murrill, Bull. Torr. Club 31: 335. 1904. 
Plants composed of а few broad pileoli, 6-15 em. in diameter 
and less than 0.5 em. thick, dimidiate to flabelliform or spathu- 
late in outline, fleshy-fibrous when fresh, more rigid when dry, 
grayish to brown, often black when dried—especially on the 
margin—,usually somewhat tomentose or fibrillose, azonate or 
subzonate, margin very thin and acute, often lobed, involute on 
drying; context white, fibrous, tough, 1-3 mm. thick; tubes 
1-3 mm. long, at first white but blackish where bruised and 
on drying, the mouth angular to irregular, often torn, averaging 
5-7 to а mm.; stipe short and thick; spores white, smooth, 
globose, 4-6 д broad. 
Growing on the ground around stumps. Frequent. 
Separated from P. Berkeleyi Fries by the smooth spores; 
from P. umbellatus Pers. ex Fries, and P. frondosus Fries, by 
the much larger and fewer pileoli, and distinct from all of these 
in the blackening of the margin or of the entire pileus and 
hymenium when bruised or in drying. In the ‘North American 
Flora’ it is described under the name of Grifola Sumstinei Murr. 
In this country it has always been held to be the same as the 
European plant P. giganteus Fries, and European specimens 
recently received from Bresadola confirm this view. А very 
good illustration will be found in Bresadola, Fungi Tridenti 
pl. 134., and in Boudier, Іс. Myc. 1: pl. 153. То the writer's 
knowledge it has not been illustrated in American mycology. 
41. P. Berkeleyi Fries, Nov. Sym. 40. 1851. 
P. апат Berk. Grev. 12: 37. 1882. 
Pileus stipitate, the stipe sometimes branching and giving 
