Fungi are a group of organisms that , despite being plants, have no leaves or flowers. In fact ,fungi do not even share the green color that most other plants display .Scientists estimate that there are over 1.5 million different species of fungi in world .Though , to date , only 100000 have been identified , leaving many more that have not been found. One interesting feature of fungi is that they often interact with other organisms in order to survive. These relationships are at times beneficial to both organisms. Other times , the fungus benefits without causing harm to the other organism.