Hi Tamiko, thanks for the question.

Unfortunately, the detail of the picture isn't clear enough to identify the "strings".  Would it be possible to get a well-focused picture of the strings?   A well-focused closeup picture of a few of the "strings" on a solid-colored background would also help.  What did you use as a planting medium?   The picture of the whole plant shows some yellowing on the bottom leaves which could suggest a possible water problem. 

I look forward to your response.