Publisher's Synopsis
Excerpt from The British Mycological Society Transactions, 1920, Vol. 7
Mr J. Ramsbottom then gave an account of mycorhiza in orchids. A seed of such an orchid as Odontoglossum is um differentiated except that the cells at the suspensor end are much the larger. If the seed be sown it merely swells: as Bernard showed, however, the seeds germinate readily if sown on a culture of the fungus extracted from the root of the orchid. The fungus passes through the suspensor into the large cells. Rapid division then takes place in the small cells at the anti podal end of the seed. Here the growing point of the stem is laid down and later the growing point of the root. The young root absorbs its way through the tissues of the protocorm and emerges at the side without touching the fungus zone, thus being free from hyphae on entering the soil. It has usually reached a length of -5 cm. Before it becomes infected from the soil. Flasks showing Odontoglossum seedlings grown on a com mercial scale, a culture of the fertilising fungus and a series of microtome sections prepared by the late Mr J. Charlesworth were exhibited.
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