The Pure Microbial Company


A new generation of mycorrhizae creating a symbiotic alliance between soil fungi and plant roots.

The relationship formed between mycorrhizae fungi and plants is mutualistic and found in plants growing in varying environmental conditions all around the world. Roughly, 95 percent of plants form a dependency of the fungi and thrive from the mutualistic relationship. There are several categories of mycorrhizae that are based on the morphological characteristics and plant-specific association. The three main and most common categories of mycorrhizae are the endomycorrhizae, ectomycorrhizae and the specialty fungi ericoid mycorrhizae. With the different variations, it is important to choose the right mycorrhizae to achieve the best results.

Our company specializes in the mass production of the three main categories of mycorrhizae. With our advanced proprietary technology for in-vitro production, we are able to produce mycorrhizae in the purest form.  We are also, proud of the fact that our mycorrhizae are made in the USA at our facility in Sacramento, California.

Categories of Mycorrhizae

Endomycorrhizae (AM/VAM)

Ectomycorrhizae (ECM)

Ericoid Mycorrhizae

Monotropoid Mycorrhizae

Arbutoid Mycorrhizae

Orchid Mycorrhizae

Ectendo Mycorrhizae



We have successfully developed seven Endo species of mycorrhizae with proprietary in-vitro production system to mass produce each species in product formulations of granular powder and liquid. Our advanced technology allows us to produce the purest forms of mycorrhizae without contamination.

Spores and Hyphae

Endomycorrhizae, Arbuscular (AM) or Vesicular-Arbuscular (VAM) mycorrhizae as it is commonly known as a type of mycorrhizae that generally requires a host plant to survive. The fungi will penetrate the root and enter the root cell of vascular plants and extend its hyphae (fine strands) into the surrounding soil to give plants access to greater soil volume.

Endomycorrhizae helps plants to increase the uptake of water and micronutrients from the soil and the solubilization of phosphorus for greater absorption. About 80% of the plants in the world form a symbiotic relationship with endomycorrhizae, making it most important to growers.


Our continuous R&D work has led to the development of three species of ectomycorrhizae. Ectomycorrhizae are the second most prevalent and diverse group of mycorrhizae fungi, it has at least 10% association with plants species on earth and forms symbioses with conifers and hardwood trees such as beech, birch, oaks, firs, hemlock, pines, spruce, eucalyptus, and hazelnut. Even, truffles the edible fungi produce from a type of ectomycorrhizae.

Unlike Endomycorrhizae that penetrate the root cell, ectomycorrhizae do not penetrate the cell of roots. Instead, the fungus colonize the roots by forming a web-like sheath on the outside of plant roots. The fungus helps the plants to absorb nutrients from the soil or exchange nutrients between neighboring and can help protect host roots from pathogenic fungi.


Ericoid Mycorrhizae

Our advanced mycorrhizae technology has given us the advantage to develop proprietary product formulations, which includes the highly specialized Ericoid mycorrhizae which are specific to Ericales. Ericoid mycorrhizae colonizes plant root families of Empetraceae, Epicridaceae, and Ericaceae plants such as Rhododendrons, Azaleas, Blueberry, Cranberry, Camellias, Heather, Kalmia and Vacinum.

Ericoid mycorrhizae is the term used to describe the symbiosis relationship between the Ericaceae family of plants and several lineages of mycorrhizae fungi. The relationship is formed when the mycorrhizae fungi colonize the fine hair-like roots of Ericaceae plants by forming a hyphen system outside the roots, then penetrates the walls of the cortical cells to form intracellular coils without entering the plant cell plasma membrane. This helps to obtain water and nutrients needed by the plants.