Moss Mature Capsule, median l.s., 12 µm Microscope Slide
A microscope slide with a median longitudinal section of a sporophyte from Polytrichum (moss) showing columella and spores. Quadruple stain.

A microscope slide with a median longitudinal section of a sporophyte from Polytrichum (moss) showing columella and spores. Quadruple stain.