Hornwort sporocytes. Light micrograph of a longitudinal section through a sporangium of an Anthoceros agrestis hornwort. The rounded black structures are sporocytes, part of the reproductive cycle of this plant. The sporocytes divide into spores that are dispersed on the wind to form new hornwort plants. Hornworts, liverworts and mosses are non-vascular plants collectively known as bryophytes. This sample has been imaged using bright field illumination. Magnification: x360 when printed at 10 centimetres across.