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Table 1 in Two new species of megasporangiate Sigillariostrobus Schimper (Sigillariostrobaceae) fructifications from the British Coal Measures
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Description
Table 1. Morphological comparison of Sigillariostrobus cones with in situ spores referable to Laevigatisporites glabratus.
| S. tieghemi | S. quadrangularis (Les- | S. czarnockii Bochen- | S. leiosporous Abbott, | Sigillariostrobus | |
|---|---|---|---|---|---|
| Zeiller, 1884 | quereux) White, 1903 | ski, 1936 | 1963 | saltwellensis sp. | |
| nov. | |||||
| Cone size | 160 mm long | Up to 160 mm long, av- | ca. 180 mm long, 17– | Up to 180 mm long, | At least 86 mm |
| 25–50 mm | erage width 11.6 mm | 25 mm broad | 20 mm broad | long, 17–20 mm | |
| broad | broad | ||||
| Cone axis | 1 mm | 7–8 mm | 4–7 mm | 1.2 mm | |
| Sporophyll | Alternating | In whorls | Helical with sporo- | Alternating verticils | Helical |
| arrangement | whorls with | phylls lying above one | of 4–5 sporophylls; | ||
| 8–10 per whorl | another | 3–4 mm between | |||
| verticils | |||||
| Sporophyll | With prominent | Sporophyll laminae | Sporophylls 20–25 mm | Pedicels: 5–7 mm long, | Laminae ca. |
| shape | heel | 9 mm long | long; upper part | 1 mm broad at attach- | 6.5 mm long, |
| sharply pointed with a | ment point, widening to | spreading out- | |||
| hollowed-out deltoid | 4 mm | wards from | |||
| shape, margin ciliate. | Laminae: broadly | cone | |||
| triangular, acuminate, | |||||
| 5–8 mm long, 4–6 mm | |||||
| broad, margin ciliate | |||||
| Sporangia | None observed | 4 mm long, 5 mm high, | 4–7 mm long, breadth | 4–5 mm long, 2 mm | 7 mm long, |
| 4 mm broad | 2–4.5 mm; | high, 4–4.5 mm wide; | 2.5 mm high | ||
| contain three tetrads of | contains one tetrad of | ||||
| megaspores | megaspores | ||||
| Peduncle | Acicular leaves | None observed | At least 40 mm long | At least 65 mm long | None observed |
| or bracts | and 7–8 mm broad, | and 2–5 mm broad, | |||
| attached to the | uppermost 30 mm with | covered with minute | |||
| upper portion | long, triangular and | stiff spines up to 1 mm | |||
| pointed sterile leaves | long | ||||
| 25 mm long and 25 mm | |||||
| wide at the base | |||||
| Age and | Age unknown, | Brazil Formation, | Duckmantian, Upper | Upper Freeport (no. | Upper Langsettian– |
| locality | Valenciennes, | Upper Pottsville, | Silesian Basin, Poland | 7) Coal Allegheny, | Duckmantian |
| France | Duckmantian/ | mid-Pennsylvanian, | |||
| Bolsovian | Bolsovian/Asturian, | ||||
| Indiana, USA | southeastern Ohio, | ||||
| USA |
Notes
Published as part of Thomas, B. A. & Seyfullah, L. J., 2016, Two new species of megasporangiate Sigillariostrobus Schimper (Sigillariostrobaceae) fructifications from the British Coal Measures, pp. 5 in Fossil Record 19 (1) on page 5, DOI: 10.5194/fr-19-1-2016, http://zenodo.org/record/10965366
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Additional details
Identifiers
References
- Zeiller, R.: Cones de fructifications de Sigillaires, Ann. Sci. nat. Bot., 19, 256 - 280, pls 11 - 12, 1884.
- White, D.: Stratigraphy and paleontology of the Upper Carboniferous rocks of the Kansas Section, Department of the Interior, U. S. Geological Survey Bulletin 211, Ser. C, Systematic Geology: Paleontology, 6, 1 - 106, 1903.