My genuine specimens will be delivered with a “Certificate of authenticity, age and origin” and scientific papers allowing plant identification! I will send You a combine invoice. Museum quality, beautiful fossil seed fern species. All data will be provided with the specimen. Stratigraphy: Upper Carboniferous, Pennsylvanian / Stephanian B. 290 – 300 Mya. Matrix dimensions: ca 14,0 x 11,5 x 1,0 cm. Rare specimen from closed site of beautiful pre dinosaur Upper Carboniferous plant – arborescent tree seed fern ALETHOPTERIS BOHEMICA. Seed ferns (Pteridosperms) were group of seed plants from the Carboniferous and Permian periods (about 360 to 250 million years ago). Some, such as Medullosa, grew as upright, unbranched woody trunks topped with a crown of large fernlike fronds; others, such as Mariopterids, were woody vines. All had fernlike foliage; however, they reproduced by seeds, with ovules and pollen organs attached to the fronds. Gamete – producing structures in the seeds were surrounded by a hard inner integument and a fleshy outer layer. These features have led some authorities to speculate that these seeds may have been dispersed by animals. Some seeds were large. Pachytesta gigantea , a seed of Medullosa, grew up to 7 cm long. Pollen organs of seed ferns were also large and complex and were commonly made up of many pollen sacs fused into a large structure. The item “Museum quality beautiful pre dinosaur fossil fern Alethopteris bohemica Franke” is in sale since Thursday, April 9, 2020. This item is in the category “Collectables\Rocks, Fossils & Minerals\Fossils\Plants”. The seller is “paleobotanica_com” and is located in SOSNOWIEC. This item can be shipped to North, South, or Latin America, all countries in Europe, all countries in continental Asia, Australia.
- Modified Item: No
- Type: Fossils
- Sub-Type: Plants
- Pre dinosaur fossil plant: Carboniferous