Anatomy of Cycas Leaflet. Ø Cycas leaflet is with distinct midrib and lateral wings. Mid-rib is swollen and the wings are flattened. Margins of the leaves are revolute (curved downward) in Cycas revoluta. Ø Anatomically, the leaf is differentiated into: § Upper Epidermis § Hypodermis § Mesophyll § Vascular Tissue § Lower Epidermis

Each leaflet is sub-sessile and lanceolate in shape having an acute apex. A midrib is present in each leaflet. 14. The margin of leaflets is revoluted or curved down­ward in C. revoluta, while it is flat in C. circinalis and C. rumphii. 15. Leaves are circinately coiled when young (Fig. 5). 16.

According to Chamberlain (1935) the “vernation is circinate in the midrib and pinnules of Cycas”. Leaves, when young, have circinately coiled pinnae like those of ferns (Fig. 8.14). Very young parts of Cycas are also covered by fern-like hairs or ramenta.

Internal structure of a cycas leaf can be differentiated into a swollen midrib portion and two lateral wings. The wings are curved downwards. The outermost layer of leaf consists of thick-walled epidermis surrounded by layers of cuticle.

Oct 8, 2024 · The pinnae, or leaflets, contain a prominent midrib devoid of lateral veins. The margins of the pinnae are typically flat but can sometimes curve downwards and inwards (revolute), leading to the specific nomenclature of C. revoluta.

According to Chamberlain (1935) the “vernation is circinate in the midrib and pinnules of Cycas”. Leaves, when young, have circinately coiled pinnae like those of ferns (Fig. 8.14). Very young parts of Cycas are also covered by fern-like hairs or ramenta. 2. Scaly Leaves or Cataphylls:

Feb 1, 2025 · Foliage leaves of Cycas are formed every year. They are coiled when they emerge. The young leaves have a midrib but no lateral veins. Moreover, foliage leaves will gradually fall off which will leave leaf bases on the stem. The characteristics of foliage leaves are as follows. They are formed as a single crown arranged in a whorl.

a zone, 3 cells thick, of elongated colourless cells which run parallel to the leaf surface from the midrib to the margin. It constitutes the accessory transfusion tissue. The development of this tissue in the leaflet of Cycas serves to compensate for the unbranched condition of the midrib as it …

Rachis has several vascular bundles arranged in the shape of inverted omega ( ). Each leaflet is sessile, leathery, stiff, and lanceolate with only midrib and without lateral veins. Margin is entire revolute with acute or spinous apex. Some of the lower leaflets are modified into spines.

Jul 31, 2023 · The leaves have circinate vernation and have a midrib without lateral veins. The foliage leaves are not permanent and fall off, leaving leaf bases. Xylem contains tracheids and xylem parenchyma but lacks vessels.