Lagenostoma Lomaxii on:
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''Lagenostoma'' is a genus of seed ferns ( Pteridospermatophyta), based on ovules preserved in coal balls from the Six Inch Coal of the Hough Hill Colliery near Stalybridge, England. Distinctive stalked glands enabled Oliver and Scott to attribute these seeds to fernlike foliage of ''Sphenopteris hoeningshauseni'' in the same coal balls. This was the first recognition that some Carboniferous fernlike leaves had seeds, and so were not pteridophytes, but rather Pteridospermatophyta, or seed ferns. The realization that seed plants as well as spore plants had fernlike leaves was a major contribution to the evolutionary history of plants.
Description
''Lagenostoma'' has large (7–8 mm) ovules arranged in branching structures. The genus name comes from the distinctive prepollen receiving structure of a cone blocked by a growing plug of tissue.Whole plant associations
*''Lagenostoma lomaxii
''Lagenostoma'' is a genus of seed ferns (Pteridospermatophyta), based on ovules preserved in coal balls from the Six Inch Coal of the Hough Hill Colliery near Stalybridge, England. Distinctive stalked glands enabled Oliver and Scott to attribute ...
'' from the Late Carboniferous Six Inch Coal of the upper Millstone grit near Stalybridge UK, has distinctive stalked glands linking it with stems of ''Lyginopteris oldhamiana
''Lyginopteris'' is a genus of Late Carboniferous seed fern stems with a very distinctive outer cortex of sclereids forming a pattern in cross section like Roman numerals on a clock face, often called a '' Sparganum'' cortex. Some ''Lyginopteri ...
'' and ''Sphenopteris hoeninghausenii
''Sphenopteris'' is a genus of seed ferns containing the foliage of various extinct plants, ranging from the Devonian to Late Cretaceous. One species, ''S. höninghausi'', was transferred to the genus ''Crossotheca'' in 1911.
Biology
The ...
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References
External links
* Pteridospermatophyta Pennsylvanian plants Prehistoric plant genera Fossil record of plants Pennsylvanian first appearances Pennsylvanian extinctions {{carboniferous-plant-stub