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Showing results for tags 'medullosa'.
hitekmastr posted a gallery image in Members Gallery
From the album: Carboniferous Plant Fossils in My CollectionThis 2 inch Trigonocarpus is a seed of a Medullosa (pteridosperms seed plants) which grew in shallow swamps abour 306-308 million years ago when St. Clair, PA was located near the Equator. Leaves associated with this seed & tree include Alethopteris and Neuropteris. It is thought that these seeds were encased in fleshy "fruit" like an avocado. The seeds were open at the pointed end to allow pollen to enter when the seeds dropped into the water in the shallow swamps where these trees grew. These were the largest Carboniferous seeds, growing up to 4 inches.
The following classification scheme was adopted: Anderson, J.M., Anderson, H.M., and Cleal, C.J. (2007), Brief history of the gymnosperms: classification, biodiversity, phytogeography and ecology, Strelitzia 20, South African National Biodiversity Institute, Pretoria (LINK).
Stocksdale posted a topic in General Fossil DiscussionA bit of information I came across today in Paleobotany: The Biology and Evolution of Fossil Plants . Arthropleura may have been important for pollination of Medullosa (seed ferns such as Macroneuropteris and Allethopteris). It sounds like one of the lines of evidence is an arthropleura part from Mazon Creek. Interesting.....