a. | Episporium smooth, not strongly developed (up to c. 1 µm wide); spore base only slightly conical; smell none; never on dung: C. martinii |
b. | Episporium wrinkled, strongly developed (up to c. 2.5 µm wide); spore base distinctly conical; smell strong 'narcotic'; often on dung: C. radicans |