Crozier (mycology) Crozier (mycology) A crozier is an anatomical feature of many fungi in the phylum Ascomycota that form at the base of asci and look like hook-topped shepherd’s staffs or stylized religious crosiers. During the ascus initial formation the crozier helps to maintain a dikaryotic state in the ascus initial and its side branch that will continue the spreading growth of the ascogenous hyphae in Ascomycota fruitbodies. The tips of developing asci on these ascogenous hyphae curl over. One haploid nucleus migrates into the curved tip while the other compatible haploid nucleus remains in the penultimate space below the hook. The
Glossary of invasion biology terms Glossary of invasion biology terms The need for a clearly defined and consistent invasion biology terminology has been acknowledged by many sources. "Invasive species", or "invasive exotics", is a nomenclature term and categorization phrase used for flora and fauna, and for specific restoration-preservation processes in native habitats. "Invasion biology" is the study of these organisms and the processes of species invasion. The terminology in this page contains definitions for invasion biology terms in common usage today, taken from accessible publications. References for each definition are included. Terminology relates primarily to invasion biology terms with some ecology terms included to clarify