Dec., 1910.] 
Notes on Ohio Agarics II. 
247 
NOTES ON OHIO AGARICS II. 
Wilmer G. Stover. 
During the fall of 1910 two Agarics were collected by the 
writer which seem worthy of especial notice. 
Pleurotus corticatus Fr. Pileus 5-20 cm., fleshy, whitish at 
margin to grayish-brown at disk, convex, dry, marginate behind; 
at first floccose, finally floccose-scaly ; margin even, flesh thick, 
white. 
Lamellae white or lutescent, subdistant, broad (6-10 mm.), 
decurrent, often forked, anastomosing behind. Spores white, 
oblong, 4-5x9-11 mic. 
Stipe 3-11 x 1-4 cm., white, sometimes yellowish at the base, 
eccentric, fleshy, firm, solid, tapering downward; sometimes rather 
short but usually long and rooting; pruinate above, floecose- 
pulverulent below. 
Veil white, lacerate, rather thin; sometimes forming a slight 
annulus but mostly appendiculate to margin of pileus. 
Growing from large decayed spot in living elm; somewhat 
gregarious. Over twenty pilei were found at the time. Colum- 
bus, O., Oct. 26, 1910. 
Morgan* reported this species from the Miami Valley over 
twenty-five years ago, and F. M. O'Bryne collected immature 
specimens of the same species at Oxford, O., Oct. 26, 1909. In 
both these collections the pileus was white or whitish. My spec- 
imens differ somewhat from the Friesian description, but the differ- 
ences are not of specific importance. In some respects they agree 
with P. dryinus (Pers.) Fr., but the differences are greater than the 
resemblance. 
Collybia tuberosa Bull. Pileus 2-5 mm., convex, subumbonate, 
glabrous or nearly so, even, white or with brownish tinge. Lamel- 
lae, white, thin; distant and rather broad for size of pileus. Spores 
white, elliptical. Stipe, .5x5-20 mm., arising from rounded yel- 
lowish or brownish tubercle; flexuous, white to rufescent, fragile, 
glabrous at top, white-tomentose toward base. 
The plants were growing upon decaying fungi and other vege- 
table matter, and were rather smaller than the sizes given by Peck. 
The lamellae are usually described as “close,” but I should call 
them rather distant for the size of the pileus. The species may be 
readily recognized by the prominent sclerotioid tuber at the base 
of the stipe. Collected at Sugar Grove, O., Nov. 5, 1910. 
The plants reported from the Miami Valley by Morgan 
(1. c., p. 73) as C. cirrhata Schum., probably belonged to this 
species since C. cirrhata does not have sclerotia. In Morgan’s 
herbarium, now at Iowa City, Iowa, there are specimens labeled 
Marasmius sclerotipes Bres., which probably are also C. tuberosa. 
Bot. Dept., Ohio .State Univ. 
* Morgan, A. P., Mycologic Flora of the Miami Valley, Jour. Cin. Soc. 
Nat. Hist. 6 : 79, April, 1883. 
