What Fern Is This?

[Maxx]

Here's a fern (well at least I think it's a fern) that sprouted up in my terrarium and grew rapidly to be as tall as the terrarium itself. I have no idea what it is, but it has long roots running along the surface of the moss it's growing in. Anybody know what it is? I would very much like to know.

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Here's a closer picture.

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Here's an even closer picture.

 

[obregon562]

I have way smaller ones of this species running around like weeds! For that fern to do so well, it seems that your terrarium has WAY too little light! Crank the light and it'll probably go away.

 

[Maxx]

I know. I'm trying to figure out what I need for a new terrarium setup. Barrys FAQ said to use T12 bulbs.