progress with odontocidium (pictures)

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first of all, I am having lots of sucess using spagh moss on this odontocidium hans isler. I have attatched a picture of the nice roots
..also, there is a new shoot coming up, so I will have a new pseudobulb

thank you all for helping me with my questions!!!

the only problem is... when I went ot take the pictures of the roots, I noticed strange markings on the oldest pseudobulb. I check the plant almost everyday, and that was not there before. The largest pseudobulb has what looks to be a bit of these markings as well. Does anyone know what it is? Its not mushy, or crusty or anything, its just some strange coloring, it also doesn't scratch off...

thanks!!