TUBE-BEARING FUNGI. 175 



The pileus is convex, thick, soft and somewhat spongy, especially 

 in large plants. The cap is dry and sometimes, especially when 

 young, it is powdery ; at other times, and in a majority of cases 

 according to my observations, it is not powdery. It is smooth or 

 minutely tomentose, sometimes the surface cracked into small patches. 



Figure 167. Boletus retipes. Cap yellowish brown, to olive-brown or nearly black, 

 stem yellow, beautifully reticulate, tubes yellow (natural size). Copyright. 



but usually even. The color varies greatly between yellowish 

 brown to olive brown, fuliginous or nearly black. The tubes are 

 yellow, adnate, the tube surface plane or convex. The spores are 

 yellowish or ochraceous, varying somewhat in tint in different spec- 

 imens. The stem is yellow, yellow also within, and beautifully retic- 



