Table 1 in Two new species of megasporangiate Sigillariostrobus Schimper (Sigillariostrobaceae) fructifications from the British Coal Measures

Table 1. Morphological comparison of Sigillariostrobus cones with in situ spores referable to Laevigatisporites glabratus.
S. tieghemiS. quadrangularis (Les-S. czarnockii Bochen-S. leiosporous Abbott,SigillariostrobusZeiller, 1884quereux) White, 1903ski, 19361963saltwellensis sp.nov.Cone size160 mm longUp to 160 mm long, av-ca. 180 mm long, 17–Up to 180 mm long,At least 86 mm25–50 mmerage width 11.6 mm25 mm broad20 mm broadlong, 17–20 mmbroadbroadCone axis1 mm7–8 mm4–7 mm1.2 mmSporophyllAlternatingIn whorlsHelical with sporo-Alternating verticilsHelicalarrangementwhorls withphylls lying above oneof 4–5 sporophylls;8–10 per whorlanother3–4 mm betweenverticilsSporophyllWith prominentSporophyll laminaeSporophylls 20–25 mmPedicels: 5–7 mm long,Laminae ca.shapeheel9 mm longlong; upper part1 mm broad at attach-6.5 mm long,sharply pointed with ament point, widening tospreading out-hollowed-out deltoid4 mmwards fromshape, margin ciliate.Laminae: broadlyconetriangular, acuminate,5–8 mm long, 4–6 mmbroad, margin ciliateSporangiaNone observed4 mm long, 5 mm high,4–7 mm long, breadth4–5 mm long, 2 mm7 mm long,4 mm broad2–4.5 mm;high, 4–4.5 mm wide;2.5 mm highcontain three tetrads ofcontains one tetrad ofmegasporesmegasporesPeduncleAcicular leavesNone observedAt least 40 mm longAt least 65 mm longNone observedor bractsand 7–8 mm broad,and 2–5 mm broad,attached to theuppermost 30 mm withcovered with minuteupper portionlong, triangular andstiff spines up to 1 mmpointed sterile leaveslong25 mm long and 25 mmwide at the baseAge andAge unknown,Brazil Formation,Duckmantian, UpperUpper Freeport (no.Upper Langsettian–localityValenciennes,Upper Pottsville,Silesian Basin, Poland7) Coal Allegheny,DuckmantianFranceDuckmantian/mid-Pennsylvanian,BolsovianBolsovian/Asturian,Indiana, USAsoutheastern Ohio,USA