inner-rim cycle broad
Small (3.5-5.5 µm); inner-rim cycle broad; thin axial cross
Small (4-5 µm); central area restricted; inner-rim cycle narrow
Medium to large (7-12 µm)
Small (4-6 µm); inner-rim cycle narrow, axial cross delicate
Additional bars form a diamond-shpaed structure around centre of cross
Typical form, small-meds (4-8µm), elliptical with axial cross but lacking other distinguishing features
Medium-sized (5-7 µm) inner rim-cycle almost fills the central area and often shows strongly oblique elements
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