Pistillipollenites macgregorii Rouse is redescribed incorporating the detailed morphological characteristics of apertures and exine as seen through the scanning electron microscope. It is proposed that P. macgregorii be restricted to only those triaperturate pollen that have apertures resembling irregular pores in general configuration. Apertures in P. macgregorii appear as circular to elliptically depressed weak areas distributed equatorially. The exine consists of three layers: a foot-layer, baculate-layer, and a tectate-layer that forms large and small primary gemmae. Some primary gemmae bear large and small secondary gemmae. Graphs of size distribution of both Alaskan and Burrard Formation populations show essentially no difference in size. Pistillipollenites appears to be most characteristic of Paleocene and Eocene assemblages that reflect humid, warm temperate to subtropical conditions, and were probably deposited relatively in situ.