| Several sheaths have a refringent, transparent central lumen and appear empty. |
| Rocks, refringent or matte, with various degrees of tints, opalescent or opaque, with wide or narrow mineral veins, orchestrate a play of fabric and light. |
| These were filled with mature, refringent spores, as observed under the microscope. |
| Droplets of extractives only appeared in the inner ring of sapwood in some cells of the ray parenchyma as small refringent bodies. |
