| 词条 | Quercus furuhjelmi |
| 释义 |
|fossil_range = {{fossil range|Paleogene}} |image = |genus = Quercus |species = furuhjelmi |authority = Heer }}Quercus furuhjelmi was a type of 'brown (or 'chestnut') oak' that lived in the Paleogene era; it is only known by its fossil remains, which have been found in Kazakhstan[1] and Alaska.[2] According to some authorities (Trelease, 1924)[3] they were related to the white oaks, subgenus Lepidobalanus (or leucobalanus) while others relate them to the Heterobalanus of East Asia.[3] Chestnut oaks are a seemingly polyphyletic group. The chestnut oaks of East Asia (for example Q. crispula Blume) have been placed in the subgenus Heterobalanus,[3] while a chestnut oak from western North America – Q. sadleriana R.Br.ter is considered by some to be a member of the Leucobalanus subgenus and by others to be in the Heterobalanus subgenus.[3] Comparison of the brown leaves of the chestnut tree and the brown oaks does not indicate any fundamental distinction between the foliage of these groups, although some species of heterobalanus have some pointed teeth, which are absent in leucobalanus. Some specimens of Q. furuhjelmi also had some sharp teeth, which suggests that this species was probably related to Heterobalanus.[3][4] References1. ^[https://doi.pangaea.de/10.1594/PANGAEA.526586 Bruch, Angela A; Zhilin, Sergey G (2006): Miocene macroflora of Ashutas (Kazakhstan). PANGAEA] Accessed 20 May 2018 2. ^[https://www.researchgate.net/publication/260135711_Palynology_of_Eocene_strata_in_the_Sagavanirktok_and_Canning_Formations_on_the_North_Slope_of_Alaska Palynology of Eocene strata in the Sagavanirktok and Canning Formations on the North Slope of Alaska] Palynology 26(1):59–93 · December 2002, accessed 20 May 2018 3. ^[https://www.fs.fed.us/psw/publications/documents/psw_gtr044/psw_gtr044_001.pdf 'Ecological Relationships: Neogene History of the California Oaks' "Several specimens of the early and middle Miocene Alaskan Q. furuhjelmi Heer are definitely bristle-tipped (Wolfe and Tanai)"] fs.fed.us, accessed 21 May 2018 4. ^1 2 3 4 [https://books.google.co.uk/books?id=B_PEFR9iJR4C&pg=RA5-PA32&lpg=RA5-PA32&dq=fossil+Quercus+furuhjelmi&source=bl&ots=TpBfthkkBA&sig=t_z6Ih4bR8uXhQUJyFNO2mh71U8&hl=en&sa=X&ved=0ahUKEwiPwdTv8JPbAhXID8AKHZQAAiYQ6AEIPzAI#v=onepage&q=fossil%20Quercus%20furuhjelmi&f=false U.S. Geological Survey Professional Paper, Issues 1101-1108] p 32, Accessed 20 May 2018 External links
1 : Quercus |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。