part_of part of part of dehiscence zone spore capsule annulus anillo de la c&#225psula de musgos (Spanish, exact) capsule dehiscence zone (exact) rwalls A dehiscence zone (PO:0025092) that is part of a spore capsule. 胞子蒴（さく）環帯 (Japanese, exact) plant_anatomy spore capusule annuli (exact, plural) 2010-10-27T11:16:33Z PO:0025093 Found in bryophytes. The capsule annulus is located at the base of an operculum. Upon capsule maturation, cell separation in the annulus allows the operculum to separate from the capsule, aiding in spore dispersal. sporangium