Leucosporae 



III. RIGID^E (rigidus, rigid). Page 194. 



Pileus without a viscid pellicle, absolutely dry, rigid, the cuticle com- Russuia. 

 monly breaking up into flocci or granules. Flesh thick, compact, firm, 

 vanishing away short of the margin which is straight (never involute), 

 soon spreading, and always without strice. Stem solid, at first hard, 

 then softer and spongy. Gills, a few dimidiate, others divided, rigid, 

 dilated in front and running out with a very broad, rounded apex, 

 whence the margin of the pileus becomes obtuse and is not inflexed. 

 Exceedingly handsome, but rather rare. 



IV. HETEROPHYLL^ (R. heterophylla, the typical species 

 of the section). Page 198. 



Pileus fleshy, firm, with a thin margin which is at first inflexed, then 

 expanded and striate, covered with a thin adnate pellicle. The gills 

 consist of many shorter ones mixed with longer ones, along with others 

 which are forked. Stem solid, stout, spongy within 



V. FRAGILES (fragilis, fragile or brittle). Page 2OI. 



Pileus more or less fleshy, rigid-fragile, covered with a pellicle which 

 is always continuous, and in wet weather viscid and somewhat separ- 

 able; margin membranaceous, at first convergent and not involute, in 

 full-grown plants commonly sulcate and tubercular. Flesh commonly 

 floccose, lax, friable. Stem spongy, at length wholly soft and hollow. 

 Gills almost all equal, simple, broadening in front, free in the pileus 

 when closed. Several doubtful forms occur. R. Integra is specially fal- 

 lacious from the variety of its colors. 



* Gills and spores white. 



** Gills and spores white, then light-yellowish or bright lemon- 

 yellowish. 



*** Gills and spores ochraceous. 



COMPAC'TVE. 



R. ni'gricans Bull. nigrico, to be blackish. Pileus 2-4 in. and 

 more broad, olivaceous-fuliginous, at length black, fleshy to the margin 

 which is at first bent inwards, convex then flattened, umbilicato-de- 

 pressed, when young and moist slightly viscid and even (without a 

 separable pellicle), at length cracked in scales. Flesh firm, white, 



187 



