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plural baculums or bacula
A bone found in the penis of some mammals. quotations examples
Bacula can be straight rods, s-shaped curves, or even bizarre, flared scoops.
2018 January 24, Elsa Panciroli, The Guardian
A small rod-like structure found in spores and pollen. quotations examples
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).
1993, M. R. Saxena, Palynology: A Treatise, page 34