1. In natural mycorrhiza, as well as in synthetic one, of Pinus densiflora with Armillaria matsutake the hyphae enter into the outer brown-colored cortical cells, but they cannot be found in the inner well-swollen, vivid, colorless cells; they cannot be seen also in well-swollen cylindrical colorless epidermal cells.
2. The investigation to obtain mycorrhiza was tried successfully by cultivating both the gills taken from the fruit body of Armillaria matsutake and the seedlings of Pinus densiflora on fructose-galactose agar culture medium.
3. Judging from the results of pure culture (slow growth of the mycelia) and of the investigation to obtain mycorrhiza, the mycorrhizal establishment of Armillaria matsutake with Pinus densiflora in the forest seems to be very rare.