The foot layer and endexine formation are concomitant with the callosic wall dissolution.
Chia-Chin Liu, Tseng-Chieng Huang 2003, 'Anther and Pollen Wall Development in Dumasia miaoliensis Liu and Lu (Fabaceae)',Taiwaniahttp://tai2.ntu.edu.tw/taiwania/abstract.php?type=abstract&id=23. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)