Aspergillus Rhizopus fungi polyethene toxigenic grow methanogenic secretagogues produce asexual aspergillus botulinum bacteria hormones Claviceps portulacastrum microorganisms phytohormones larviform epigeous hypogeous 37QdgC Clostridium Benzocaine Zygosaccharomyces spores hormone trihalomethanes mesophiles Leptospira pheromones chartarum spore meristems respires yeast asexually Ascomycota