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What is strobilus of Equisetum?

What is strobilus of Equisetum?

Horsetails (Equisetum arvense) are hollow-stemmed plants that anchor deep into the ground by an extensive, creeping root system. Also commonly known as mare’s tail, horse pipes, or snake grass, their origins reach far back into the past, some 200 million years.

What are male strobili?

The male strobili are typically about 0.4-0.8 in (1-2 cm) in diameter and form on the lower part of the tree. The female strobili are much larger and form on the upper part of the tree. The male strobilus is composed of many modified leaves, called microsporophylls, which are spirally arranged about a central axis.

Does Equisetum have strobili or cones?

Strobili or cones are found in Equisetum. Strobili or cones are the dense and compact structure present on non flowering plants. They contain sporangia and perform function of protecting spores from wild animals and harsh conditions of environment. In Equisetum they are present at terminal position on stem.

What is a strobili in gymnosperms?

Gymnosperm seeds are not enclosed in an ovary; rather, they are only partially sheltered by modified leaves called sporophylls. You may recall the term strobilus (plural = strobili) describes a tight arrangement of sporophylls around a central stalk, as seen in pine cones.

What is the position of strobilus in Equisetum?

The strobilus are terminal in position and generally are borne terminally on the chlorophyllous vegetative shoot (Fig.

What is produced in the strobilus?

The central stem produces bracts and in the axil of each bract is a cone scale. Morphologically the cone scale is a reduced stem. Ovules are produced on the adaxial surface of the cone scales.

What is Pinus male cone?

Pinus is a monoecious plant that carry both male and female cone on the same plant but on different branches. The male cone (staminate /microsporangiate strobilus) bears spirally arranged microsporophylls on the central axis. Each microsporophyll carries two microsporangia on the underside.

Are cones present in Pinus?

The members of the pine family (pines, spruces, firs, cedars, larches, etc.) have cones that are imbricate (that is, with scales overlapping each other like fish scales).

Do Cycas have strobili?

The female Cycas strobilus is comprised of a loose assemblage of individual megasporophylls. Plants with emerging megasporophylls were selected within each of the locations in Feb.

Where is strobili found?

Strobili or cones are found in some pteridophytes (like, Selaginella and Equisetum) and all gymnosperms.

What is the structure of Equisetum?

The plant body of Equisetum has an aerial part and an underground rhizome part. The rhizome is perennial, horizontal, branched and creeping in nature. The aerial part is herbaceous and usually annual. Majority of the species are small with a size range in between 15 and 60 cm in height and 2.0 cm in diameter.

How do strobili reproduce?

In a microsporangiate, or pollen-producing, strobilus there are two fused bracts at each node forming a cup-shaped structure (collar) that encloses numerous fertile shoots. Each fertile unit consists of two bracteoles enclosing a microsporophyll or microsporangiophore with two sporangia at the tip.