baculum

noun

1. A bone found in the penis of some placental mammals.

   “Bacula can be straight rods, s-shaped curves, or even bizarre, flared scoops.”

2. A small rod-like structure found in spores and pollen.

   “The sexine usually consists of two main parts, a partially or wholly covering layer — the tectum (roof) and below that the rods or rod-like elements — the bacules (baculum, columella).”