Figure 4.

Photobiont sharing among Nephroma species on a global scale. Photobiont genotypes are given as letters within circles that denote fungal species with respective names given at the edge of each circle. Most bipartite Nephroma species share their Nostoc symbionts with one or more other fungal taxa, and no fungal species associates solely with a single Nostoc genotype, supporting the concept of functional lichen guilds. *Species for which photobiont sharing cannot be shown since only one Nephroma species was sampled from the same region.