22
2 Systematic Descriptions
Fig. 2.3 A Equisetum fluviatile; immature pollen, a whole pollen. b, c Mature pollen in the process
of splitting, d split pollen of Equisetum
Description: Whole specimen spheroidal. Test splitting equatorially into two equal
parts. The test of each hemisphere bears a circumpolar ridge of thickened wall.
Dimensions: 25–35 µ (8 specimens measures).
Affinity: The fern spore Hypolepis repens growing in Australia today is the closest
in comparison to Peltacystia monile. It also splits equatorially and has intricate
sculptured exine (Fig. 2.5).
Genus Circulisporites (de Jersey 1962; Norris 1965).
Diagnosis: Test spheroidal. Equatorially splitting into two equal parts. Wall monolayered. Sculpture consists of concentric ribs.
2 Systematic Descriptions
Fig. 2.3 A Equisetum fluviatile; immature pollen, a whole pollen. b, c Mature pollen in the process
of splitting, d split pollen of Equisetum
Description: Whole specimen spheroidal. Test splitting equatorially into two equal
parts. The test of each hemisphere bears a circumpolar ridge of thickened wall.
Dimensions: 25–35 µ (8 specimens measures).
Affinity: The fern spore Hypolepis repens growing in Australia today is the closest
in comparison to Peltacystia monile. It also splits equatorially and has intricate
sculptured exine (Fig. 2.5).
Genus Circulisporites (de Jersey 1962; Norris 1965).
Diagnosis: Test spheroidal. Equatorially splitting into two equal parts. Wall monolayered. Sculpture consists of concentric ribs.