@article {12730, title = {Biodiversity gradients in obligate symbiotic organisms: exploring the diversity and traits of lichen propagules across the United States}, journal = {Journal of Biogeography}, volume = {43}, year = {2016}, pages = {1667{\textendash}1678}, keywords = {Biodiversity, Biology}, doi = {10.1111/jbi.12746}, author = {Erin A. Tripp and James C. Lendemer and Albert Barber{\'a}n and Robert R. Dunn and Noah Fierer} }