when young white with ochraceous tints, when partly grown dark gray 
with a brown (somewhat hygrophanous) center, thin. Gills rather dist¬ 
ant, reaching the stem, when mature (but before deliquescing) black 
Fig. 21. 
Coprinus angulatus, (unexpanded plants, natural size.) 
with a white edge. Stipe pure white, equal, hollow, striate, when very 
young evidently white scurfy but appearing glabrous when grown. 
Spores very peculiarly angular shape like a key-stone, 9x14 me. 
This plant grew on burnt ground in the woods, somewhat gre¬ 
garious. Quelet describes it “sur les charbonnieres,’’ and I found it 
growing with Flammula carbonaria and Psathyra pennata, species 
noted for their preference to ground 
that has been burnt over. From its 
peculiar spores and its evident re¬ 
semblance to Peck’s figure of Coprinus 
silvaticus we do not question its deter¬ 
mination, though the original descrip¬ 
tion was from dried specimens and 
based principally on the spores. Quelet 
has since described and beautifully 
illustrated it (Bull. Soc. France, 1877), 
Under the name Coprinus Boudieri. gp 0res 0 f Coprinus angulatus. Micro-photograph by Dr 
The shape of the spores is likened by Edward Thompson. 
Peck to a “very blunt arrow-head, being slightly excavated on each 
side of the base and gradually narrowed toward the very obtuse apex.’ 
Quelet likens them “to a tiara or mitre.’’ It seems to us that a key¬ 
stone closest expresses their shape. 
47 
