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Obscure gymnosperms from the Late Triassic
Obscure gymnosperms from the Late Triassic
The Iraniales were established in 1977 by Schweitzer for a group of gymnosperms found in the Late Triassic of Iran. The reproductive structures contained male and female portions. The male structures were more proximal and catkin-like. The ovulate structures were on distal branches, appearing flattened and as heart-shaped capsules. The reproductive structures are similar to Leptostrobus, and the leaves are similar to Desmiophyllum, possibly indicating affinities with the Czekanowskiales. Some researchers accept this order as taxa within the Czekanowskiales.
Ecology & Form
Ecology & Form
Stems
Stems
Unknown
Leaves
Leaves
Desmiophyllum-type foliage (i.e. elongate leaves with parallel venation) is found in the same rocks and may be connected
Reproduction
Reproduction
Seed plants that may have affinities with Czekanowskiales
Reproductive structures were called "flowers" and they were structurally "perfect" (male and female in same structure)
Pollen-producing structures
Axis bearing helically-arranged clusters of microsporangia appearing catkin-like
Pollen is unknown
Ovulate structures
Secondary axes that dichotomized to produce two flattened, heart-shaped "capsules"
There is a ridge of delicate tissue along the ridge of these capsules
These structures may have similarities to Leptostrobus (in the Czekanowskiales)
Geologic Age
Geologic Age
Classification
Classification
└Iraniales †
Above: Reconstruction of Irania hermaphroditica
Above: Desmiophyllum foliage
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