#endospore

• Bacilli — The plural form of the masculine noun bacil; a heterogeneous group of bacteria exhibiting an elongated, cylindrical, or rod-like microscopic morphology. They can aggregate in chains (streptobacilli) or pairs, classified based on cell wall structure through Gram staining, and intensely studied for their pathogenic role in epidemiology or utility in biotechnology.
• Bactrospore — A bacterial or mycological spore characterized by an elongated, cylindrical, rod-like shape. Microbiologically, the term describes endspores generated inside certain bacteria or the reproductive structures of lower fungi, whose geometric shape is essential for taxonomic identification under the microscope and for high resistance in adverse external environments.