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Arbuscular mycorrhiza I am the fungi arbuscular mycorrhiza. I am almost all over the world and live in about 90 percent of plants. I have been found in fossalized form from the early Early Devonian times, a time known for the development of terrestrial flora, this showed I played a crucial role in the movement of plants from the ocean to the land, the evolution of land plants. I spread around the soil around the roots of plants. I grow the cell walls of plants forming a tree like structure called an arbuscule inside the cell lumen exchanging nutrients. All of these terms refer to mycorrhizal structures. In arbuscular mycorrhizae, the fungus penetrates the soil for a few centimeters (or less) around the fine roots. I help plants, such as those with small roots, or those that lack fine root hair to take up nutrients from the soil. I go through 3 stages before root colonization, which are spore germination, hyphal growth, and host recognition and appressorium formation. My spores are restings structures and I only germinate under suitable temperature, carbon dioxide concentration, pH and phosphorus concentration. My hyphae only grow long under low phosphorus conditions. In my hyphae there is a high surface to volume ratio, plus my roots are finer, so more nutrients can enter and be absorbed then roots. I form an obligate symbionts relationship between plants, and I can not survive with out an carbon food source from the plants. The more carbon supplied to me, the more nutrients I supply to the plant, on the other hand, sometimes I am not a good symbiotic and provide little or no phosphorous, and take in a lot of carbon source.