MYCOLOGIA 



Vol. IV July, 1912 No. 4 



ILLUSTRATIONS OF FUNGI— XI 



William A. Murrill 



All of the illustrations here shown, except one, wtre made from 

 plants collected in Bronx Park and the vicinity. Very few of 

 these plants are known to be of economic importance ; one or two 

 species are generally classed with the poisonous fungi. 



Suillellus luridus (Schaeff.) Murrill 

 Lurid Boletus 



Plate 68. Figure i. X i 



Pileus convex, gregarious or subcespitose, 5-12 cm. broad; sur- 

 face dry, smooth, glabrous or minutely tomentose, sometimes 

 clothed with rather conspicuous appressed, felted fibers, occa- 

 sionally rimose-areolate, brown with shades of red or yellow, 

 often bright brownish-red, becoming paler with age; margin thick, 

 obtuse, entire, sometimes slightly differing in color; context firm, 

 whitish to flavous, quickly changing to blue when wounded, some- 

 times unchanging in older plants, considered somewhat poisonous ; 

 tubes nearly free, rarely adnate, plane or slightly convex in mass, 

 yellow w^ithin, changing to dark greenish-blue when wounded, 

 mouths small, circular, cinnabar-red, becoming brownish-orange, 

 darker with age ; spores oblong-ellipsoid, smooth, olivaceous when 

 fresh, 11-16X4-6^; stipe subequal, 5-10 cm. long, 1-2 cm. 

 thick, usually furfuraceous or punctate, at times nearly glabrous, 

 rarely reticulate at the apex or on the upper half, red or reddish- 

 brown below, yellow or orange above, the dots rosy or dark-red, 

 solid, yellow within, varied with red or purple. 



[Mycologia for May, 1912 (4: 109-162), was issued May 8, 1912.] 



163 



