Difference between phellogen and phelloderm is

Isobilateral ( equifacial )  leaves are placed in a plant in  such a way that both its surfaces receive equal amount of sunlight.It doesnot have distinct upper and lower surfaces. Mesophyll is usually indistinguishable. Most of the monocot plants have isobilateral leaves.

The cortex consists of several layers of thin walled parenchyma cells. Intercellular spaces are small but abundant. The cortical cells can be rounded, oval or angular.
They store food. The major function of the cortex in the root hair zone is conduction of water and minerals from the epiblema to the interior of the root. 

The endodermis of a dicot stem is rich in starch grains, so it is called starch sheath .

Upper surface is covered by adaxial epidermis
Lower surface is covered by abaxial epidermis

Casparian strips or carsparian strps or casparian bands.

Bulliform cells make the leaves curl during the condition of the water stress. The epidermal cell modification in plants that prevents water loss is known as Bulliform Cells.

Earlywood is the another name of springwood and latewood is another name of autumnwood.

Collenchyma  and sclerenchyma are types of simple permanent tissues.

Apical meristems  are responsible for the growth in length of roots and shoot 

Cuticularised trichoblasts or epidermal hair which produce a stationary layer of air over the surface that reduces isolation and rate of transportation.

It protoxylem lies next to phloem the condition of the xylem arrangement is called as exarch.

It is made of cellulose, hemicellulose and pectic substances

Fascicular combium and phellogen ( cork cambium).

Root apical meristem - Root Tip
Shoot apical meristem - Topmost regions of stem axis.

Difference between lenticels and stomata are

Differences between intrafascicular cambium and interfascicular cambium are 

A well-developed pith is present in dicot stem and monocot roots.

In gymnosperms , Vessel elements are not present in xylem, whereas , these are main constituents in angiosperms . In the phloem of gymnosperms, companion cells are not associated with the sieve elements . In angiosperms , companion cells are associated with the sieve elements of phloem.

Secondary growthg in stems of woody angiosperms occurs by two types of cambia, i.e., vascular cambium and cork cambium
(i) Vascular Cambium Ceratin cdells of medullary rays become meristematic to form interfasicular cambium.The fascicular cambium and the interfasicular join to form a complete ring  called cambial ring. The cells of the cambial ring undergo mitotic divisions and produce secondary phloem on its outer side and secondary xylem on its inner side.
At places , vascular cambium possess ray intials.They form vascular rays, phloem rays in seconadry phloem and wood rays in secondary xylem.
As new secondary phloem becomes functional , the previous older phloem gets crushed. Secondary  xylem or wood persists.As a result wood grows with age in the form of annual rings.
In each annual ring , there is wide or broader spring or early wood or spring wood and narrow autumn or late wood.
In old stems, the central part of wood becomes non-functional and dark coloured due to presenceof tyloses and deposition of resins , gums, and tannins.It is called duramen or heartwood.The outer functional wood is called sapwood .
(ii) Cork Cambium As the stem continues to increase in grith due to the activity of vascular cambium the ouiter cortical and epidermal layers get broken and need to be replaced to  provide new protective cell layers.In this way , cork cambium or phellogen develops in the cortex region .Phellogen cuts of cells on both sides.
The outer cells differentiate into cork or phellem while, the inner cells differentiate into cork or phellem while , the inner cells differentiate into secondary cortex or phelloderm.Due to activity of  cork cambium, pressure builds up on the remaining layers peripheral to phellogen  and dultimately these layers peripheral to phellogen nad ultimately these layers die and sloghed off.
At places , aerating pores called lenticules develop, which have loosely  arranged complementary cells.
Significance of secondary Growth 
(i) It repalces old non-functional tissues.
(ii) It provides fireproof, insect proof  and insulating cover around the older plant parts.
(iii) Commercail cork is a product of secondary growth .
(iv) Wood is the product of secondary growth.

The hormones secreted by plant body  influence anatomical changes in it. In the future  are of abscission , a special narrow abscission  zone develops. It consists of  a upper lignified amd suberised protective layer. The seperation  layer consists of  unthicked cells where the hydrolysing enzymes develop.
Pectnases are secreted out to dissolve middle lamallae.Cellulases bring  about  hydrolysis  of cell walls.Due to this, the seperation layer becomes soft and weak.This leads to sheding of leaves from plants. 

The dicot stem is characterised by the presence of conjoint, collateral, and open vascular bundles, with a strip of cambium between the xylem and phloem. The vascular bundles are arranged in the form of a ring, around the centrally-located pith. The ground tissue is differentiated into the collenchyma, parenchyma, endodermis, pericycle, and pith. Medullary rays are present between the vascular bundles.
 

The monocot stem is characterised by conjoint, collateral, and closed vascular bundles, scattered in the ground tissue containing the parenchyma. Each vascular bundle is surrounded by sclerenchymatous bundle-sheath cells. Phloem parenchyma is absent and water-containing cavities are present.
 

Difference between lenticels and stomata are given below