Nymphoides peltata

A well-developed gyroid membrane can also be identified in the differentiating sieve elements of Nymphoides peltata investigated in [40], in which planes cut approximately normal to the 211 plane are evident (Fig. 7.6(c)). These and similar sections of the gyroid (see [57] for another example) are sometimes very difficult to assign, and can be confused with certain sections of the P-PCS structure. We have found it particularly important to investigate the influence of section thickness to avoid any confusion. 

O Shea, P., Walters, J., Ridge, L, Wainright, M., Trinci, A.P.J., 1990. Zeta potential measurements of cell wall preparations from Regnellidium diphyllum and Nymphoides peltata. Plant Cell Environ. 13,447 54. 

---