In the comments for one collection of Clavariadelphus pallido-incarnatus Darvin provided the following notes:

Clavariadelphus pallido-incarnatus – Tip flat to roundish, pinkish, KOH negative, lacking basidia. Widest part of fruiting body the tip, total length 3-6 inches, lacking folds and deep wrinkles.

Clavariadelphus occidentalis – Tip pointed to roundish, cream, beige or yellowish color, KOH red, basidia covering tip. Widest part of fruiting body in the mid-section, total length 3-9 inches, becoming longitudinally compressed with folds and deep wrinkles.