Mycorrhizae, symbiotic fungal-plant communities, are important to the success of revegetation efforts. Most woody plant species need these root-fungi communities to thrive, and nursery or greenhouse transplants may not have sufficient or correct mycorrhizae for good survival. Mycorhizal communities are particularly beneficial to nitrogen-fixing woody plants, C4-grasses, and soil environments low in phosphorus. Two types of mycorrhizal fungi aid in restoration: ectomycorrhizal fungi and arbuscular mycorrhizal fungi.