Azygospore is an asexually formed zygospore in fungi. Also known as parthenogenically formed from a gamete without gametic fusion. Sometimes, gametangia fail to fuse. Gametangia become surrounded by a thick wall resulting in the formation of azygospore
References C.J. Alexopolous, Charles W. Mims, M. Blackwell et al., Introductory Mycology, 4th ed. (John Wiley and Sons, Hoboken NJ, 2004) ISBN 0-471-52229-5