Mycorrhiza can be seen in Pinus and coralloid root in Cycas. Mycorrhiza – system association between the roots of higher plants & fungi.

Thalloid (thallose) liverworts have a ribbonlike, or strap-shaped, body that grows flat on the ground. They have a high degree of internal structural differentiation into photosynthetic and storage zones.

Mosses form dense mat over the surface of ground, thereby helping in preventing soil erosion.

Important features of mosses
(i) Erect, radially symmetrical leafy body produced from filamentous or thalloid juvenile stage is called protonema.
(ii) They bear multicellular branched rhizoids.
(iii) Sporophyte contains large amount of green tissue and is partially dependent upon the gametophyte

In liverworts, the plant body is thalloid, eg., Marchantia. The thallus is dorsiventral and closely appressed to the substrate.
In mosses, the predominant stage is the gametophyte.
It has two phases
(i) Protonema stage which develops directly from a spore.
(ii) Leafy stage which develops from the secondary protonema as a leaf bud.

The thallus structure in Rhodophyceae varies from unicellular to pseudoparenchymatous thallus.
(i) Unicellular thallus (Porphyridium).
(ii) Filamentous thallus (Polysiphonia)
(iii) Pseudoparenchymatous thallus (Gelidium).

Two advantages of artificial system of classification are 
(i)  Artificial system is very easy to remember as it uses only one or a few characters for comparison.
(ii) The traits used are of interest to humans.

Kingdom - Plantae includes multicellular eukaryotic organisms with the photosynthetic mode of nutrition, cell wall cellulose and plastids containing starch as the main reserve food.

Kingdom - Plantae includes unicellular members of green algae e.g., Chlamydomonas Chlorella

Flowering plants are placed in ascending series related to their complexity of floral morphology

Natural system of classification is based on morphology, anatomy, cytology, embryology, molecular biology and genetics of organisms

It indicates the possible origin of diffferent organisms.

Artificial, natural and phylogenetic

Plant kingdom is rich with a large number of species. At every stage of evolutionary development there are interesting examples of new structures coming up to give better tools of survival to the plant
The natural habitat of algae is water, so they can be compared to aquatic animals. As life started in the aquatic environment so algae are the most primitive group of plants. Moreover, their structure is simple with no special organs for special functions.
The way amphibian animals are like a linking point between aquatic and terrestrial life, bryophytes show the same characteristic. Bryophytes need water to facilitate reproduction although they live on soil. In bryophytes we witness some development of leaf-like structures and root like structures. Antheridiopore and Archegoniopore can be compared to flowers of angiosperms
When we analyze Pteridophytes we can see development of vascular tissues for transport of substances. Pteridophytes show true roots as well. While the dominant phase is gametophyte in bryophytes it is sporophyte in Pteridophytes. This is another indication of evolution Gymnosperm look more like a common plant, with well defined roots and stem. Appearance of seeds is another indicator of development. Seeds gave the ability to survive longer durations of adverse conditions. This is a sort of guarantee to continue progeny even after a long spell of adverse environmental conditions.
Angiosperms are more advanced because of many factors. The seed is covered, which means more protection to the embryo. Appearance of flowers was a means to facilitate cross pollination for more variations. Angiosperms can modify almost any part for special purpose. For example, certain plants store excess food in modified leaves or stems or roots.
This essay is an interesting description of how from simple thalloid algae plants have developed into more complicated angiosperms. While algae have a simple thallus to carry out all biological functions, angiosperms have dedicated tissue systems for various functions.

Horticulturists are interested in Ginkgo as it has natural immunity to several plant diseases.
Important features are as follow
i)The plant is a tall tree of upto 30 m height.
ii) Leaves - shaped.
iii) Leaves have furcate venation.
iv) Dwarf shoots of female plant bear distinct megasporangiate structures.
v) Endosperm of roasted seed is edible 
Horticulturists prefer to grow only male plants,as female plant give unpleasant smell.   

Structure of Bryophytes. It is thallus-like and prostrate or erect, and attached to the substratum by unicellular or multicellular rhizoids. They lack true roots, stem or leaves. They may possess root-like, leaf-like or stem-like structures