218 FUNGUS-FLOEA. 



same colour and shining appearance as the pileus. I have 

 had no opportunity of tracing the growth of this fungus, 

 but Mr. Purton informs us, that the lacquered appearance is 

 occasioned by a thick, glutinous, reddish juice, which exudes 

 from every part of the pileus and stipes, and soon dries. 



II. APUS. 

 Sessile, dimidiate or effuso-reflexed. 



Fomes ulmarius. Fr. 



Pileus white, effused, sometimes with an obtuse free 

 margin, corky, then woody and hard, cuticle crustaceous, 

 tuberculose, smooth ; flesh white ; tubes stratose, whitish, 

 pores minute, rounded, yellowish or at first tawny, spores 

 elliptical, 7-8 x 4 ;«,. 



Polyporus ulmarius. Fries, Syst. Myc. i. p. 365 ; Berk., 

 Engl. FL, vol. V. p. 142 ; Cooke, Hdbk., p. 276. 



On old elm trunks. 



Effused, with an obtuse, occasionally free margin, forming 

 a new stratum every year, so that a section gives several 

 distinct layers of pores and flesh, alternating with each 

 other ; flesh white ; pores minutely tawny ; substance when 

 dry, hard and corky. (Berk.) 



Pileus 4r-10 in. across, often yellowish with age. Tubes 

 ^f in. long when old and stratified; pores about ^ mm. 

 across. 



Fomes populinus. Fr. 



"White, pileus between corky and woody, rigid, zoneless, 

 villose, margin obtuse ; white within ; pores minute, short, 

 rounded. 



Polyporus populinus. Fries, Syst. Myc. i. p. 367; Fries, 

 Hym. Eur., p. 664. 



On white poplar. 



Imbricated, grown together at the deourrent base, trans- 

 versely dilated. I have the same on black poplar nearly 

 solitary, pileus at first floccoso-mealy, very hard and woody 

 when old. Both are white within, not stratose. (Fries.) 



