Cuticular Anatomy of Angiosperm Leaves from the Lower Cretaceous Potomac Group I. Zone I Leaves
dc.contributor.author | Upchurch, Garland R. | |
dc.date.accessioned | 2007-11-06T19:40:56Z | |
dc.date.available | 2012-02-24T10:03:17Z | |
dc.date.issued | 1984-02 | |
dc.description.abstract | Angiosperm leaf cuticles from the oldest part of the Potomac Group reinforce previous paleobotanical evidence for a Cretaceous flowering plant diversification. Dated palynologically as Zone I of Brenner (Aptian?), these remains show a low structural diversity compared to later Potomac Group and modem angiosperms. All cuticle types conform to a single plan of stomatal construction that is unusual in its extraordinary plasticity: both the number of subsidiary cells and their arrangement vary greatly on a single epidermis, such that the stomatamight be classified as paracytic, anomocytic, laterocytic, and intermediate. Such stomatal diversity is uncommon in extant angiosperms but is known from a few Magnoliidae. Many species possess secretory cells comparable to the oil cells of modem Magnoliidae, and a few show the bases of probable uniseriate hairs. None of the cuticle types can be assigned to a single modem family, but several show similarities with Chloranthaceae and Illiciales. These results support the concept that subclass Magnoliidae includes some of the most primitive living angiosperms. | |
dc.description.department | Biology | |
dc.format | Text | |
dc.format.extent | 11 pages | |
dc.format.medium | 2 files (.pdf) | |
dc.identifier.citation | Upchurch, G. R. (1984). Cuticular anatomy of angiosperm leaves from the lower Cretaceous Potomac Group. I Zone I Leaves. American Journal of Botany, 71(2), pp. 192-202. | |
dc.identifier.doi | https://doi.org/10.1002/j.1537-2197.1984.tb12503.x | |
dc.identifier.uri | https://hdl.handle.net/10877/2569 | |
dc.language.iso | en | |
dc.publisher | Botanical Society of America | |
dc.source | American Journal of Botany, 1984, Vol. 71, No. 2, pp. 192-202. | |
dc.subject | Cretaceous | |
dc.subject | angiosperms | |
dc.subject | cuticle | |
dc.subject | stomata | |
dc.subject | anita | |
dc.subject | Potomac group | |
dc.subject | angiosperm | |
dc.subject | Chloranthaceae | |
dc.subject | illiciales | |
dc.title | Cuticular Anatomy of Angiosperm Leaves from the Lower Cretaceous Potomac Group I. Zone I Leaves | |
dc.type | Article |