Some mamilarias in test tubes, placed on filter paper in liquid MS media.
<a href="//commons.wikimedia.org/wiki/User:Juan_de_Vojn%C3%ADkov" class="mw-redirect" title="User:Juan de Vojníkov">Juan de Vojníkov</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>. Taken as a schollar work at the <a href="https://en.wikipedia.org/wiki/University_of_Life_Sciences_Prague" class="extiw" title="w:University of Life Sciences Prague">University of Life Sciences Prague</a>, Czech Republic.