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Cuticle Micromorphology of Podocarpus, Subgenus Podocarpus, Section Scytopodium (Podocarpaceae) of Madagascar and South Africa

Authors: Frevel, B.J.; Stockey, R.A.; Woltz, P.;

Cuticle Micromorphology of Podocarpus, Subgenus Podocarpus, Section Scytopodium (Podocarpaceae) of Madagascar and South Africa

Abstract

Cuticle micromorphology of leaves from seven species and three varieties of the conifer genus Podocarpus subgenus Podocarpus section Scytopodium from South Africa and Madagascar was studied with scanning electron microscopy. External and internal features of abaxial and adaxial cuticles are characterized for all taxa and are compared with other known Podocarpus species. External cuticles exhibit Florin rings and stomatal plugs with underlying epidermal cell outlines usually visible. Leaves are hypostomatic and stomata occur in discontinuous but fairly regular rows in most species. Stomata are oriented parallel to the long axis of the leaf and usually lack polar subsidiary cells. From two to six subsidiary cells occur, with two or three being the most common. Internal cuticle on subsidiary cell surfaces is granular to rugose, usually with a deep groove corresponding to the external Florin ring. Cuticle on guard cell surfaces is granular or rugose to pitted, and prominent polar extensions are present in all species. Epidermal cell outlines are undulating and cuticle on epidermal cell surfaces is granular to rugose and pitted. The most useful characters to distinguish species of this section are the micromorphology of cuticle on the guard cell and subsidiary cell surfaces, epidermal cell shapes, and sometimes the length of polar extensions.

Country
Canada
Related Organizations
Keywords

Podocarpaceae, Laubenfels, New Zealand

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Powered by OpenAIRE graph
Found an issue? Give us feedback
selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
5
Average
Average
Average
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