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
Biology: The Unity and Diversity of Life Biology: The Unity and Diversity of Life Biology: The Unity and Diversity of Life is a college-level introductory biology textbook that helps students learn how to apply critical thinking and scientific methods to developing their understanding of basic concepts in molecular biology and biochemistry, genetics, biotechnology, reproduction and embryonic development, anatomy and physiology of plants and animals, evolution, taxonomy, and ecology. The book is designed to create in students a broad foundation of knowledge in biology and is frequently used in AP Biology classes in American high schools. Each book includes an interactive CD-ROM with links to additional instructional material.