Radial, trilete, acamerate miospores. Amb subcircular. Trilete mark distinct to obscured, sutures simple or with narrow thickened labra, extending at least three-quarters of spore radius. Exine 2–3 µm thick bearing dense ornament of prominent bacula. Bases of individual elements wide and sometimes coalescent. Shafts are commonly parallel sided, but may taper slightly, sometimes with terminal constrictions. Terminations truncated, rounded or pointed, rarely weakly multifurcate. Length of elements 8–26 µm, width 2–7 µm.
Sullivan, 1968, p. 119–120, p1. 25, figs. 6–8.
Higgs, Clayton and Keegan, 1988, p. 58, pl. 4, fig. 11
Equatorial diameter excluding projecting ornament 60(73)95 µm
Neves & Dolby 1970 differs by possessing more robust, more densely distributed bacula that are often fused at their bases. R. macrura
(Luber) Dolby & Neves 1970 is distinguished by possessing bacula which are smaller and more tapered in profile.
Mississippian; Tournaisian; VI to CM biozones (Higgs et al., 1988)
MPK 7374 Figure 39a
Pinskey Gill Beds, Wygarth Gill Borehole, Ravenstonedale, Cumbria, England; Tournaisian, CM Biozone, Sample MPA 292, Specimen MPK 7374. Subcircular trilete spore. Trilete suture obscured by ornamentation. Exine relatively thick, bearing dense baculate ornament on entire distal surface and equatorial portion of proximal surface. Bacula variable in form but most are broad based, parallel-sided, slender shafts with rounded or multifurcate terminations.
Specimen maximum dimension 73 µm.
MPK 7376 Figure 39b
Cementstone Group, Bracken Bay, Heads of Ayr, Ayrshire, Scotland; Tournaisian, CM Biozone, Sample MPA 29832, Specimen MPK 7376. Note densely distributed baculate ornament that is variable in character.
Specimen maximum dimension 77 µm.