Rusty Backed Fern
- Information on this species, Ceterach officinarum, and how to examine the scales on the underside of the leaves under the microscope to reveal intricate details.
- http://www.microscopy-uk.org.uk/mag/artsep98/bdfern.html

Ceterach officinarum
- Several photographs of Rustyback Fern and a description.
- http://www.plant-identification.co.uk/skye/aspleniaceae/ceterach-officinarum.htm