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• W2083291269 abstract "Fossilized remains of the strobili of the Paleozoic Lycopodiales have frequently been reported but usually as flattened impressions showing little or none of the original structure. Of petrified remains structurally preserved, only two discoveries have thus far been reported in America. Lepidostrobus Fischeri Scott & Jeffrey (3) is a portion of a petrified strobilus from the Mississippian of Kentucky, and another specimen which has not received specific designation is reported from the Pennsylvanian of Iowa (i). The recently discovered Michigan specimen is an entire cone but neither of the others were complete. The specimen under consideration was found by Professor H. H. Bartlett in a sandstone layer in a shale pit one mile west of Grand Ledge, Michigan, during the summer of I929. The formation exposed at this place is considered as belonging to the Pottsville series which is low down in the Pennsylvanian system. Two coal seams, each a foot or more in thickness, are exposed in the quarry and the accompanying shales and sandstones have yielded several species of Carboniferous plants. Stigmaria ficoides, the root like organ of the Lepidodendreae, is abundant. The cone, which measured 2.5 X I .5 centimeters, had the general shape and dimensions of a good sized cigar (text fig. I). It tapered rather gradually at both ends and had been flattened to about one-half of its original diameter. Judging from the base of the cone, it was originally borne on a peduncle. Preservation of the structure is only partial. The xylem strand is intact but the phloem, the cortex, and the attachment of the sporophylls have disappeared. Also the spores had escaped and nothing remained of the sporangia except the crumpled fragments of the walls mixed with the infiltrated siliceous matrix. Since most of the structure of the sporophylls had disappeared and the sporangia had collapsed, very little could be determined concerning the morphology of these parts. However, decay did not take place until the enclosing matrix had partly solidified which resulted in the formation of cavities in the rock mass which were formerly occupied by the bracts. The cavities corresponding to the free upturned laminae on the distal portion of the stipes are well shown on the upper portion of the cone. On the lower portion the outside is broken away so as to show the" @default.
• W2083291269 created "2016-06-24" @default.
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• W2083291269 date "1930-12-01" @default.
• W2083291269 modified "2023-09-26" @default.
• W2083291269 title "A PETRIFIED LEPIDOPHYTE CONE FROM THE PENNSYLVANIAN OF MICHIGAN" @default.
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• W2083291269 doi "https://doi.org/10.1002/j.1537-2197.1930.tb04938.x" @default.
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