Although Fungi were once considered to be part of the plant kingdom,
most experts now consider them to be a separate Kingdom or phylum. There
are estimated to be over 100,000 different fungi, most of which form
only tiny threads (Hypha) that can only be seen through a microscope. Of
these, about 20,000 are considered to be high fungi or macro fungi, i.e.
those that produce visible fruiting bodies. Only these are of any
interest to the fungi enthusiast and covered in any detail, mostly of
which belong to the subdivision Ascomycotina and Basidiomycotina.
Species of fungi are divided into the following three categories
1 - Mycorrhizal fungi form a partnership with some plants,but mostly
with living trees.
2 - Parasitic fungi prefer the living host; this category is fairly
small.
3 - Saprophytic fungi prefer dead and decaying material.
Mycorrhizal
Mycorrhizal fungi form a partnership mainly with trees but also with
some plants, but rather then harming the tree, their presence
significantly increases the roots' effectiveness. Fungi send their
hyphae in and about the little rootlets of the tree until its difficult
to tell them apart. The tree supplies the mycelium with moisture and
carbohydrates, and the mycelium returns the favour with minerals and
other nutrients from the surrounding soil. Mycorrhiza fungi are
beneficial both in nature and agriculture; plants with them tend to grow
better than those without.
Parasitic
Parasitic fungi are the second largest group, of whose members do a lot of
serious damage. Rather than obtaining their food from dead animals or plants,
they prefer a living host, often attacking and killing, it then living on as a
saprophytic fungi.
Saprophytic
Saprophytic fungi are the largest group of fungi, they growing on dead organic
matter such as fallen trees, cow patties, dead leaves, and even dead insects and
animals. These fungi have enzymes that work to "rot" or "digest" the cellulose
and lignin found in the organic matter, with the lignin being an important
source of carbon for many organisms. Without their digestive activities, organic
material would continue to accumulate until the forest became a huge rubbish
dump of dead leaves and trees. |