Rootbound and more

As I said in my intro posting, I am taking over the care of some very neglected orchids and have never worked with them before. For years they have been hand watered occasionally but mostly surviving off rainwater, with nothing else done to care for them.
They are extremely rootbound, one (labeled 'C') looks like it is completely dead, and there looks like there could be fungal issues in the root system. The last couple of years have been extremely wet, with record flooding and mould breaking out everywhere.

The orchids in the smaller hanging baskets produced hanging flowers from the bottom of the pot, amongst the roots, that had a very strong musky-vanilla/candy fragrance that filled the whole house. I don't know what type/species etc they are but I would really like to keep and propagate them if possible.
The larger orchid in the pot is a Sydney rock orchid. Recently had a bad mealy bug infestation but doesn't appear damaged from it. It does however have large black blotches on some leaves (sunburn?), if someone knows what this is and how to treat/prevent it I'd appreciate any help.

My understanding is that they need to be divided, re-potted and any fungal issues fixed. Is this correct?
After watching some videos on YouTube, there doesn't seem to be too much involved and the whole process seems to be:
- Remove all old growing medium
- Break up into clumps with min. 3-5 (false?)bulb thingys
- Prune dead roots, cutting only dead root and leaving a small nub of dead material on living root
- Repot with orchid potting mix

Videos I watched were:




A few questions though:

- Most videos have orchids being potted in regular-style pots rather than hanging baskets. With my smaller orchids growing hanging flowers from the bottom, I'm assuming I should keep them in the baskets with coco fibre lining. Is this correct or will they flower ok in a regular-style pot?

- After trimming the dead roots, how should I treat any fungal issues? Can I just use any off-the-self fungicidal or are orchids particularly sensitive to one treatment method vs another?

- The orchids currently get mostly shaded/filtered sunlight most of the day. I know they don't like too much sun, but what lighting is best for recovery after re-potting?

- Also, if anyone has any information regarding the identity of the smaller orchids, I would appreciate any info. Type, species, etc. Anything that might help me better look after them.

Sorry for the long post and thanks in advance for any help

 

Thanks for your reply Marni.
I had to go into town today, so I swung by a nursery and they helped me with a fungicidal that they use on their orchids.

Sounds like their current lighting is ideal, along with their baskets with some fresh lining.

I looked up Stanhopea and after some looking around, I believe they are Stanhopea tigrina. They have very recognisable flowers and are extremely fragrant. Thanks for pointing this out.

My father always called this a Sydney Rock Orchid and it looks like its name is
Dendrobium speciosum, so you are correct there too.

I read that the Stanhopea tigrina are best repotted after flower(late summer-autumn) or early spring, so with it being late autumn I think the timing should be ok to do it now.
I haven't read up on the Dendrobium yet though and am not sure what sized pot it should go into. It will need to be split into at least 2 pots I'm thinking.

 

Just an update.
I watched this video before starting re-potting and I think there are some good tips in it:



Plant C was toast and I had to toss it.
There were heaps of dead roots in the remaining plants and I was reluctant to to cutting them off wholesale since there were healthy roots mixed in that could be damaged. So I cut away as much as I could but still left a lot of dead roots attached when I re-potted the plants. Is this ok? Will the dead roots just breakdown?

Some of the leaves have black spots on them. Is this sunburn or something else? How should this be addressed?

I was able to divide one plant, which is good since I had to toss plant C.
One of the bags of the orchid potting mix had some sort of fungus growing through the mix and I was reluctant to use it, so I was unable to re-pot all of the plants.
I still have one S. Tigrina, the Dendrochilum/Coelogyne and the Dendrobium speciosum to re-pot once I get some more potting mix.
Other than one hanger basket being a little on the small side, I think the re-potting went ok.