Abstract
Cultures <i>in vitro</i> made in agar are rather precarious, because gel strength varies both with the medium formula used and the source and grade of agar. Any solidifying agent (like for example agar) should be strong enough to support cultivated plantlets, yet liquid enough to allow the nutrients and drossy products from plants through the medium. It should also be a chemically inert material. Agar, especially in acid solutions, is an undefined constituent of culture media, namely in the mentioned properties. Silica sand, used in cultures of herbs up to the present time, is applicable also in cultures of <i>Sorbus sudetica</i>. The required acid medium is exactly defined if sand is substituted for agar. Similar cultures of wood species, including conifers, will be realized in future research.
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