412 



BOTANY 



PART n 



other cases they have a stalk, bearing an umbrella-like expansion, from the under 

 side of which the outgrowths depend. The latter form is exhibited by the edible 

 fungi Hydnum imhrkatum, which has a brown pileus 15 cm. wide, with dark scales 

 on the upper surface, and Hydnum repandum (Fig. 346), with a yellowish pileus. 



Fic. 3-47. — Boletii'i SataiMs. (After Krombholz, ;V nat. size.) I'oisoyors. 



5. In the Polyporeae, a group containing numerous species, the stalked or 

 sessile and bracket-shaped fructifications are indented on the under side with pit- 

 like depressions, or deep winding passages, or covered with a layer of tubes, closely 





Flii. Zi?i. — l'olyporus hjuLuriai. Sueliuu through an old 

 frnctitication, showing annual zones of growth ; «, 

 point of attachment. (!. nat. size.) 



Kk;. oi'.i. -I'iuUiuta canipCitfii ( = .!t;a- 

 rirus campest ris). Mushroom. To 

 tlie riglit a young fructification. 

 (Reflueed.) 



fitted together and lined by tlie hymenium. To this family belongs the genus 

 Boletus, occurring on the soil of woods, which has a large, thick-stalked j'ilews, 

 covered on the under side with a layer of narrow dependent tubes. Although 

 many species of this genus are edible {c.y. B. cdnUs), others are exceedingly 



