| Venuloid idioblasts in Pteris and their systematic implications. |
| The mesotesta is parenchymatous presenting collateral vascular bundles and druse idioblasts. |
| Mesophyl presented very abundant crystalliferous idioblasts, containing calcium-oxalate microcrystals. |
| In B. weddellii, crystalliferous idioblasts were also present on the lateral lobes. |
| Idioblasts containing druses closer to the adaxial epidermis also occurred. |
