Radial, trilete, acamerate miospores. Amb rounded triangular. Trilete mark distinct, sutures simple, straight, extending two-thirds to three-quarters of spore radius. Distal surface and equatorial portion of proximal surface of exine bears predominantly baculate ornament with infrequent coni and verrucae. Baculae rarely exceed 3 µm in height, basal diameter exceptionally up to 10 µm but commonly less, terminations truncate or apiculate. Density of ornament variable with 15–20 processes commonly protruding at the equator. Exine between processes laevigate; up to 5 µm thick.
Artüz, 1957, p. 246, pl. 3, fig. 19.
Smith and Butterworth, 1967, pp.180–181, pl. 8, figs. 17–20
Overall equatorial diameter 39(52)69 µm
Kosanke 1950 is larger. No other species assigned to the genus Raistrickia
has such low, broad-based baculae.
Pennsylvanian; Bashkirian [Kinderscoutian to Duckmantian]; KV to NJ biozones (Clayton et al., 1977)
MPK 7380 Figure 40a
BGS Offshore Borehole 74/13, 18.07 m, Firth of Forth, Scotland; Bashkirian [Duckmantian], NJ Biozone, Sample CSA 1231, Specimen MPK 7380. Rounded triangular miospore with densely distributed ornament of broad-based low bacula with tapering sides and rounded or multifurcate terminations. Remainder of exine laevigate.
Specimen maximum dimension 57 µm.
MPK 7382 Figure 40b
BGS Offshore Borehole 74/13, 18.07 m, Firth of Forth, Scotland; Bashkirian [Duckmantian], NJ Biozone, Sample CSA 1231, Specimen MPK 7382. Specimen with simple, straight, trilete sutures extending at least three-quarters of spore radius. Larger of the broad-based baculate ornament elements appear to be located at the equatorial margin; elements over remainder of distal surface appear smaller and organised in sub-concentric manner.
Specimen maximum dimension 69 µm.