The pollen is elliptic and monosulcate with finely reticulate, tectate exine. The pollen is discate and elliptic with tectate exine; pistillode minute. The exine is finely reticulate and tectate. In plant spores it is also referred to as the exine. In the later scenario, pollen is without an exine and stigmas are forked. The exine is what is preserved in the fossil record. The exine has a sexine which is thicker than the nexine. The outer part has a hexagonal crystalline structure and is called exine.