Glossary
Like the rest of this website, the glossary is a work in progress. If we’ve missed a term, please contact us to let us know the term and references.
Rimmed depression
A rimmed depression is a hyaline depression on the inside of a valve. It occurs only in some species of the genus Planothidium and is a depression of the asymmetric central area on the rapheless valve.
See also hood.
Alternative Terms
- hufeisen
The German term used to describe this structure is also used in English floras.
Image Credit: Marina Potapova
Image Credit: Marina Potapova
Image Credit: Marina Potapova
A scanning electron micrograph of the inside of the rapheless valve of a species of Planothidium. The arrow indicates the rimmed depression.
Image Credit: Marina Potapova
A light micrograph of the rapheless valve of a species of Planothidium with the rimmed depression at the arrow.