LEUCOSPOR.E 
157 
3 . GILLS WHITE OR CREAMY-WHITE, NEVER YELLOW OR 
OCHREOUS, BUT SOMETIMES BECOMING BLACKISH 
WITH AGE-(a) PILEUS WHITE OR CREAM COLOUR AT 
FIRST, BECOMING BLACKISH AT MATURITY 
R. nigricans ( nigricans , becoming black—from its colour 
in decay). 
P. 3-5 in., depressed, whitish at first, then sooty-olive, 
squamulose, black at maturity. F. firm, white, becoming 
reddish-black when old. G. adnexed, rounded behind, 
very thick, distant, broad, pale yellowish, becoming reddish 
when bruised. 5 . 1J-2J in., very thick, solid, pallid at first, 
then black. Common in mixed woods. Often infested by 
species of Nyctalis. 
R. adusta ( adustus , scorched—from its appearance) might 
be mistaken at first sight foi small specimens of the pre¬ 
ceding species, but the flesh does not turn red, and the gills 
are thinner, decurrent, and crowded. 
R. densifolia ( densus , thick ; folium , a leaf—from the 
crowded gills as compared with those of R. nigricans) 
resembles R. adusta , but the flesh turns red when broken. 
(b) PILEUS CLEAR YELLOW 
R. citrina (from the citron-coloured pileus), an uncommon 
inhabitant of mixed woods, is distinctive in the clear 
sulphur-yellow pileus (sometimes greenish), with brassy- 
yellow disc, and the persistently white gills and stem. 
(c) PILEUS GREEN OR OLIVE 
R. heterophylla (Gr. heteros , one of two; phullon , a leaf— 
from the unequal length of the gills). 
P. 2-4 in., depressed at maturity; colour variable, usually 
apple-green, clouded with brown, with never a trace of red 
