In some version of the words of lil hokie in another great thread: Post your Super Awsome liverwort pics here. These things are too cool and I'm hoping if you have these things growing on purpose or by accident anywhere you all would hit us with a pic. Lets get this going...
Also I've not asked permission yet, but I'll see if I can copy and paste a very useful post from Whimgrinder on the subject.
"Those are Liverworts, a type of ancient bryophyte. Virtually unchanged since the fossil record (to be played at 33 and 1/3, of course), these strange things reproduce by spores, not seed. The palm-like bodies you see in the photo are the female stalks, known as archgonia. I see no male stalks, which suggests that this species may be dioecious (male and female plants are separate, like the Nepenthes; either/or, but not both). Some species can also reproduce asexually via "gemma cups" which form like little bird nest shaped organs on the surface of the flat thallus ("leaf" surface), and the gemmae are dispersed by water splashing on the plants."
"You can see gemma cups on the thallus surface in this photo, and the cups are full of gemmae, waiting to be dispersed by rain:
Liverworts are quite fascinating.