Spores are cystic in shape, and roughly 5.0-6.0 μm in diameter. Multigene phylogenetic analysis was conducted in "F. alba" in 2009 which allowed it to be placed into Opisthokonta. The five nuclear encoded genes that were sequenced were: small subunit ribosomal RNA (SSU rRNA), actin, beta-tubulin, elongation factor 1-alpha (EF1-a) and heat shock protein 70 (HSP70). The study's results depicted that from 42 eukaryotic taxa, many alignments were made with a total of 2802 aligned sequences (Brown et al., 2009). Phylogenetic trees based on the molecular genetics sequenced in this study showed that the genus "Fonticula" was a sister taxon to the genus "Nuclearia". Those two sister taxa as a clade are in turn a sister taxa to Fungi. "Fonticula" therefore represents the first evolution of an organism with a cellular slime mold-like morphology within the broad-group Opisthokonta (Brown et al., 2009); (Brown, 2010). Another study done by Barlow et al. in 2014 traced the evolution of the five adaptor protein (AP) complexed in fungi, but also provided some insight onto "Fonticula alba". The adaptor proteins investigated work in vesicular transport in eukaryotes, particularly in cargo-selection and coat-protein recruitment. The study found that "F. alba" had all five adaptor protein complexes present in its genome, whereas the kingdom Fungi only retained the first three adaptor protein complexes (Barlow et al., 2014). This study concluded that the last common ancestor of the sister groups Fungi, and "Fonticula" and "Nuclearia" (also known as the clade Holomycota) contained a complete set of all five adaptor protein complexes. An amoeboid trophic phase alternating with an aggregating fruiting phase describes the life cycle of "F. alba". Fruiting bodies are volcano-like structures that are unique to its genus. Commencing of the fruiting stage occurs when trophic amoeba halt their feeding, and dense aggregations begin to form (Deasey, 1982). Over time, an envelope of a mucus-like substance begins to surround the aggregated amoebae.