CLASSIFICATION OF AGARI' 



Heliomyces? lis ile^h becomes tough a1 maturity, .it least in dry 

 weather. Lloyd's figure is an excellenl illustration of tin- plant 

 I found ii a1 Houghton. 



**<iills adnati dt cum ni or </• < ply dt cum nt, narrow* d to a /»>i>it 

 or line on the stt m. 



700. Pleurotus ostreatus I'r. (Edibli 



Syst. Myc, L821. 



Illustrations: Atkinson. Mushr as, PI. 30, Pig. L04, 11 



Hard, Mushrooms, PI. is. Pig. i it. L908. 



Mcllvaine, Amer. Mushrooms, Plates 35 and 35a, 1900. 



Marshall, Mushroom Book, PI. '.». 58, 1905. 



Michael, Piihrer f. Pilzfreunde, Vol. II. No. 79 (dark form). 



Plate CXLI1 of this Report. 



PILEUS 5-20 cm. or mure broad, firm, ascending or shelvii 

 conchate, subdimidiate to elongated, convex or depressed, white <»r 

 whitish becoming darker or brownish-ashy, moist, glabrous, margin 

 thin ami even, sometimes subrimose. FLESH thick'. Bomewhat 

 soft. GILLS, dose to subdistant, decurreni and running down the 

 stem in raised lines which anastomose, broad in the middle, nar- 

 rowed at ends, white or whitish. STEM lateral, short <>>■ nln 

 lacking, stout, solid, firm, often tomentose or Btrigose-hairy at 

 base, whitish. SPORES oblong, 7-10x I micr., smooth, white in 

 mass-. ODOB ami TASTE agreeable. 



Caespitosely imbricated, often in large shelving cli on 



standing dead trunks of poplar, maple, elm, hitch, willow 

 rarely on hemlock or pine; often on sawed logs scarcel) decayed. 

 Throughout the State. May to November. Common. 



Distinguished from /'. sapidus ami /'. ulmarius by the pecuU 

 cross-connections of the decurreni gills on the Btem. It has usual- 

 ly stouter ami thicket- pilei than /'. sapidus and has wh; 

 /'. ostreatus i- apparently more common in southern Michig 

 while /'. sapidus is the nsiial form in the north, although both 



found in the same region. It varies in color from dirty u' 



smoky-white, becoming brownish-tan in age like the 



spo.ies. In luxuriant specimens 'he gills are v< 



;it the ends. It i~ I the "0 



conchate pileus. Authors differ a- to whethet 



