Discussion:Pollen grains of the species of Stomatochaeta agree closely with those of
Stenopadus other than S. campestris. As shown for Stomatochaeta cylindrica in
figure 92 A-C, the grains are subprolate in shape. F.urrows are shorter than in
Stenopadus. The exine is psilate or nearly so, and exine thickness is approximately
the same as in Stenopadus. Grains of Stomatochaeta, however, seem to be
appreciably smaller than those of most species of Stenopadus.