Strains of Special Interest
- Obtained from novel or extreme habitats such as freshwater or salt-water wetlands; polluted lands; soils high in salts, phosphorus, acidity, or alkalinity to broaden ecological diversity.
- Poorly represented strains of in species of the collection (to broaden population-level diversity).
- Collected from new geographic locations, especially areas previously unexplored by collectors, to broaden geographic diversity in the collection.
- Strains pre-screened by industry for commercial application (to preserve organisms that can promote business).
- Organisms relevant to ongoing (and possibly future) research but which are in danger of being lost forever as programs change or end.
- Organisms with unique genetic qualities that make them interesting for future research such as dimorphic species, mutants, species retaining ancestral polymorphisms, or even potential cryptic species (same morphology, different genotype).
- Reference or model organisms in a broad range of comparative studies, such as Rhizophagus irregularis in the genome project and Diversispora epigaea in gene expression studies.
- New species (to increase taxonomic diversity in the collection).