What type of mold/fungus is this?

Can anyone let me know what type of mold this is? ( I think there are two, maybe different, I don't know).

http://s1282.photobucket.com/user/ValiantRift/library/

I have an area in my furnished basement that is below a window. Admittedly, this isn't a very good window and (I know now) that it likely leaks. Also below this window is a piece of furniture with that has a lip in the back which means that it isn't pressed against the wall completely.

I was poking around in the area today and decided to check behind this furniture and I'm glad I did. I found the mold/fungus in the above pictures. I've cleaned it up with bleach but I'm concerned if I need to a more extensive repair job. I'm also concerned that I know nothing about what it was.

Any help would be greatly appreciated, thanks!