Spores are fungal reproductive structures. In arbuscular mycorrhizal fungi, viable spores are one possible source of inoculum. Spore counts and viable-propagule counts answer different questions: not every counted spore necessarily remains viable.
Keep the context.
Biological compatibility, successful colonisation and a measurable plant response are different questions. The growing conditions matter, and general research is not a promise of a particular result with MegaMyco.
References
Read the biology at its source. These references describe general science and study-specific findings.