Spore-print: purplish brown.
Spores: medium sized, oval, ellipsoid with an obvious germ-pore, purplish brown under the microscope and 8-9 × 4-5 µm in size.
Marginal & facial cystidia: flask-shaped, hyaline with either a short or long neck.
The brown-spored Hebeloma anthracophila Maire is similar.
Coprinus angulatus Peck Bonfire ink-cap
Cap: width 4-25 mm. Stem: 1-3 mm; length 15-30 mm.
Description:
Cap: dark red-brown at first, then orange-brown, especially at the margin and appearing as if frosted all over, conical at first but rapidly expanding at the margin and becoming grey-brown, strongly striate and deliquescent, leaving finally only a central red-brown umbo.
Stem: white and minutely hairy.
Gills: free, dirty whitish then black.