Microsporangia of Lyginopteris.
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Answer:
Reproductive Structure of Lyginopteris:
Some of these Palaeozoic leaves bore microsporangia on them. The fertile pinnules were more or less peltate in form and on their underside they bore usually six sporangia. These sporangia are usually bilocular. Such a type has been described as Crossotheca type.
Reproductive Structure of Lyginopteris:
. Morphological Features:
The stem Lyginopteris was slender and covered with large scaly leaves. Near the base of the plant adventitious roots developed. The plant seems to have been a climber.
Lyginopteris oldhamia also known as Calymatotheca hoeninghausi was described in detail by Williamson, Scott, Brongniart, Binney, Potonie, and Oliver and Scott. It was found abundantly in the coal ball horizon of Lancashire and Yorkshire.
Microsporangia of Lyginopteris
- Lyginopteris is a Genus of fossil plants which belonged to the late Carboniferous period.
- They are considered ancestral ferns , but were different from ferns in several aspects with seed formation being the most evident.
- The pinnules (secondary divisions) of the leaves bore microsporangia on their lower side.
- The microsporangia were usually bilocular (having two chambers) and typically six in number.
- They appeared like minute hair-brushes or epaulets under the leaves.
Some related information can be found here:
Structure and function of microsporangium
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What is the Difference between Microsporangia, Micrsoporangium, Microsporogensis, MicroSpore tetrad?
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