Produced by some bacteria

• A body that resembles a spore but is not an endospore
• One of a string of thick walled vegetative resting cells formed by some algae and fungi

Wiktionary Word definitions in Wiktionary
n. 1 A sporelike cell produced by some fungi and algae. 2 A similar cell produced by some bacteria.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Arthrospore \Ar"thro*spore\, n. [Gr. ? joint + E. spore.] (Bacteriol.) A bacterial resting cell, -- formerly considered a spore, but now known to occur even in endosporous bacteria. one of the small conidia occurring arranged in chains in certain fungi. ...

WordNet Word definitions in WordNet
n. a body that resembles a spore but is not an endospore; produced by some bacteria one of a string of thick walled vegetative resting cells formed by some algae and fungi