Summary
Glyptostrobus europaeus is an extinct conifer species of the family Cupressaceae that is found as fossils throughout the Northern Hemisphere. The sole living species of Glyptostrobus (Glyptostrobus pensilis) was described from China in 1926.[1] The name of the genus comes from the Greek "glypto" meaning grooved or carved, and "strobilus" meaning cone. The species name "europaeus" refers to the fact that it was first described from Europe.
| Glyptostrobus europaeus Temporal range:
| |
|---|---|
| |
| Glyptostrobus europaeus foliage; late Paleocene, Paskapoo Formation | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Gymnospermae |
| Division: | Pinophyta |
| Class: | Pinopsida |
| Order: | Cupressales |
| Family: | Cupressaceae |
| Genus: | Glyptostrobus |
| Species: | G. europaeus
|
| Binomial name | |
| Glyptostrobus europaeus | |
History edit
Fossilized remains of Glyptostrobus were first described as Taxodium europaeus by Adolphe-Théodore Brongniart in 1833 and reassigned to the genus Glyptostrobus by Oswald Heer in 1855. The division of fossil members of the genus into a number of other species is considered by some to rest on "very unreliable criteria".[2] In fact, it has been stated that fossil Glyptostrobus does not appear to differ significantly from the living species and "it is possible that the tree now on the verge of extinction in China is the Tertiary species unchanged".[1]
Description edit
Like living Glyptostrobus, G. europaeus was deciduous and shed its branchlets seasonally. It bears leaves three types of leaves, cupressoid (scale-like), cryptomeroid (needle-like), and taxodioid (flat and oblong),[3] as well as two transitional types (crypto-cupressoid and crypto-taxodioid).[4] All are spirally arranged, but some are twisted at the base to lie in two horizontal ranks. The seed-bearing cones are pyriform (pear-shaped) and up to 20 mm long and 10 mm wide. They consist of woody imbricate (overlapping) scales that are roughly triangular in shape, and are borne terminally on short twigs with scale-like leaves. The seeds are up to 13 mm long and 7 mm wide, winged and triangular to hatchet-shaped. The pollen-bearing cones are small and globose, up to 3 mm long and 3 mm wide. They consist of acute-tipped, incurved, imbricate scales and are borne on short, alternately arranged twigs with scale-like leaves.[4][5]
Age and distribution edit
Remains of Glyptostrobus are found in sediments of Early Cretaceous (Aptian stage) to Pleistocene age in Europe, Greenland, North America and Asia. Throughout the Tertiary period Glyptostrobus was a major component of northern forests in lowland and swampy areas, where in many places it coexisted with Metasequoia occidentalis.[6]
References edit
- ^ a b Henry, A. and McIntyre, M. 1926. The swamp cypresses, Glyptostrobus of China and Taxodium of America, with notes on allied genera. Proceedings of the Royal Irish Academy v. 37, sect. B, No. 13, p. 90-116, 8 plates.
- ^ Hickey, L.J. 1977. Stratigraphy and paleobotany of the Golden Valley Formation (early Tertiary) of western North Dakota. Geological Society of America, Memoir 150.
- ^ Brown, R.W. 1936. The genus Glyptostrobus in America. Journal of the Washington Academy of Sciences, v. 26, p. 353-357.
- ^ a b Christophel, D.C. 1976. Fossil floras of the Smoky Tower locality, Alberta, Canada. Palaeontographica, Abteilung B, Band 157, p. 1-43.
- ^ McIver, E.E. and Basinger, J.F. 1993. Flora of the Ravenscrag Formation (Paleocene), southwestern Saskatchewan, Canada. Palaeontographica Canadiana No. 10, 167 p. Geological Association of Canada and Canadian Society of Petroleum Geologists.
- ^ LePage, B.A. 2007. The taxonomy and biogeographic history of Glyptostrobus Endlicher (Cupressaceae). Bulletin of the Peabody Museum of Natural History, v. 48, no. 2, p. 259-426.