Spores 1-septate with a very huge isthmus, of approximate dimensions 16 x 8 µm. The result of the key given as reference points to C. pyracea. The species proposed, C. holocarpa, is the preferred synonym for that species, though the dimensions given in "CNALH" for C. holocarpa are a bit smaller than in my specimen. The specimen in MO88869 may belong to the same species.