Spore-print: black-brown.
Spores: medium sized, dark brown under the microscope, lobed like the hat of a bishop and 8-11 × 6-8 × 5-7 µm in size.
Marginal cystidia: bottle-shaped, very variable.
Facial cystidia: similar to marginal cystidia.
General Information: It must be noted that this fungus has spores which require three quite different measurements to describe the dimension. Another species of Coprinus found on burnt soil is C. lagopides Karsten which resembles C. cinereus (Fries) S. F. Gray ([p. 211]); it is typified, however, by the rounded spores.
Plate 73. Fungi of bonfire-sites
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General notes on fungi of burnt sites
Several common fungi found at the sites of bonfires have their closest relatives amongst various groups of microscopic fungi more than amongst the large forms already discussed. Keeping a close watch at the site of a former bonfire day by day, week by week and month by month is very rewarding and shows a further example, like the dung habitat, of a tightly knit community of various groups of fungi.