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Originally Posted by patlee  Your new orchid does look like a den. Unfortunately I am not the expert of dens ,but I'm sure someone else will jump in here with the info you need. In the meantime, you can go to the AOS web site and get a cultural sheet on the care of dendrobiums. 
That white stuff around your other orchid, it reminds me of the gooey insulation that expands to fit the crevices of whatever you are insulating. I hope this thread can give you a little more detail and that you have luck with the chid. Keep us posted if you find out what it is. I have never seen anything like it before  |
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Originally Posted by jerrymeola The white growth is probably a fungal growth but while I have seen it fairly regularly it does not seem to attack the orchid. I usually remove and replace all the medium and forget about it.
Your little Dendrobium keiki looks like a Nobile Den. You will know when it flowers (Jan-March in the northern hemisphere probably June-Aug for you) because the flowers on a Nobile grow from the cane not on a stem like common Den. With either type Den you do not need to do anything special. If you are growing them outside give them as much light as they will take without the leaves browning.
The second photo of the dead leaf is more important. The blackening at the bottom of the leaf is a sign of fungal infection. If you see this type of blackening on a green leaf it is serious and can destroy a plant rapidly. Since your photo is of a yellow leaf it may be aftermath of a leaf dying of old age and not a serious problem. When it is fungal the rot will spread rapidly and needs to be cut off before it reaches the rhizome. |
where is the rhizome i just need to know so when i check my plant for futher infection.
can this infection spread to my other orchids that are near it