Dijkhuizen, L. W., Brouwer, P., Bolhuis, H., Reichart, G.-J., Koppers, N., Huettel, B., et al. (2018). Is there foul play in the leaf pocket? The metagenome of floating fern Azolla reveals endophytes that do not fix N-2 but may denitrify. NEW PHYTOLOGIST, 217(1), 453-466. doi:10.1111/nph.14843.