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SUMMARY
The Colorado type and only known collection of Coprinus elongatipes is redescribed and taxonomically re-evaluated. The reciprocate characteristics of the closely related Coprinus section Auricomi and Psathyrella series Substratae are discussed, and evidence is presented for inclusion of C. elongatipes in the latter where it falls within the circumscription of a taxon presently known as var. microspora of Psathyrella circellatipes.