I am so confused. What is this please?

[eaglssong]

Hi,

If you read my other posts, I am a rank newbie to all this, and I am now getting brain overload from all the terminology. I hope you will bear with me and my stupid questions, but I figure the only real stupid question is the one I don't ask.

I purchased two flasks while in Costa Rica. One is a Brassia verrucosa, and the other is a Trichocentrum cebolleta. I recently unflasked them, and so far they are still standing (which for me, is a shock in itself). This morning, I noticed some new growth under the moss on the Brassia. Not sure what this is (soon to be new leaves? Pseudobulb? Anything else? ). So, what I'd like to know is, what is it? Should I keep them covered by the moss, or expose them to the light and air?

Thanks for putting up with me. I can't wait for my first class at the AOS on April 25th.