Cycas is a genus of cycad, and the only genus in the family Cycadaceae with all other genera of cycad being divided between the Stangeriaceae and Zamiaceae families. Cycas circinalis, a species endemic to India, was the first cycad species to be described in western literature, and is the type species of the genus. [4][5]

Feb 3, 2025 · Here we will see the anatomical features of Cycas stem, leaves, rachis, and roots. A cross-section of the Cycas stem shows an irregular exterior due to the attachment of leaf bases. It has a single layer of epidermis having several inferences and leaf traces. The cortex is multilayered and is made of parenchyma cells.

Anatomy of Cycas. Primary and Secondary Structure of Cycas Stem with Diagrams. Anomalous Secondary Thickening of Cycas Stem. Easy Short Notes on Cycas Stem Anatomy, Girdle Traces and Leaf Traces

Cycas is a palm-like, evergreen plant (Fig. 8.8). Prior to the anatomical studies of the stem of Cycas revoluta by Brongniart (1829), the Cycas was actually considered a palm. The plant body consists of a columnar aerial trunk with a crown of pinnately compound leaves as its top.

Oct 8, 2024 · Stem: The stem of Cycas is characterized by its thickness, erect posture, and woody composition, usually exhibiting an unbranched structure known as a caudex. Branching: Branching is infrequent and typically occurs only as a result of injury or the emergence of adventitious buds. Surface Characteristics:

Feb 1, 2025 · Morphology of Cycas Stem. Cycas has an unbranched, columnar, and erect stem. Certain species of Cycas form branches when injured or upon attaining maturity. The young stem is underground and tuberous. They become columnar and aerial as they grow. The matured stem has rhomboidal leaf bases and scars formed by the scale leaves.

Cut thin transverse sections of different parts (young normal root, old normal root, coralloid root, young stem, old stem, rachis and leaflets of Cycas revoluta and C. circinalis), stain them separately in safranin- fast green combination, mount in …

An interesting feature of the stem is that, to begin with, it is monoxylic but becomes polyxylic as a result of accessory rings of cambia, which arise in the cortex. The first vascular cambium as well as the successive cambia become active simultaneously.

The stem is erect, columnar, woody and un-branched. It is covered with alternate whorls of leaf bases of foliage leaves and scale leaves. The stem apex bears a crown of leaves and sex organs at maturity.

Young stem of cycas is differentiated into epidermis, cortex and vascular cylinder (fig). The epidermis is the outermost layer of stem covered with a thick cuticle.