The proximal internal terminations of the raphe in a rectangular, elevated, elongate structure. This structure is found in Muelleria, Scoliopleura, and Neidium.

Image Credit: Sarah Spaulding
Light micrograph of a deep level of focus showing the rectelevatum in this Neidium species.
Image Credit: Sarah Spaulding
Scanning electron micrograph of an internal view of Muelleria peraustralis showing the rectelevatum.