I noticed that there are hardly any pictures on Google Images so I thought putting these here would enrich the internet. I made them with my phone so it’s not best quality but they are free to be used anywhere

It starts as a tiny piece of the leaf that has been surface sterilized 30 secs wih Ethanol (70%) and then 3 mins in 35% dilution of houshold bleach. subsequently washed twice with autoclaved water to remove bleach. You can see how they have developed after 3 weeks