Dec, 1910.] Notes on Ohio Agarics II. 247 



NOTES ON OHIO AGARICS II. 



Wilmp:r G. Stover. 



During the fall of 19 ID two Agarics were collected by the 

 writer which seem worthy of especial notice. 



Pleurotus corticatus Fr. Pilcus o-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 ^'ellowish at the base, 

 eccentric, fleshy, fimi, solid, tapering downward; sometimes rather 

 short but usually long and rooting; pruinate above, floccose- 

 puh-erulent below. 



Veil white, lacerate, rather thin; sometimes foniiing a slight 

 annulus but mostly appendiculate to margin of pilcus. 



Growing from large decayed spot in living elm; somewhat 

 gregarious. Over twentv pilei were found at the time. Colum- 

 bus, 0., 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, 0., Oct. 26, 1909. In 

 both these collections the pilcus 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. 



CoUybia 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-torn entose 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 vSugar Grove, 0., 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 vState Univ. 



* Morgan, A. P., Mvcologic Flora of the Miami Vallev, Jour. Cin. Soc. 

 Nat. Hist. 6 : 79, April,' 1883. 



