RE: DS2:Alien vegetation (x-list)

>> put together some house rules for alien plants. 

You should read Redliners by David Drake for some very
hostile plant life, poison, projectiles, vine attacks
, spores - its all there and its a decent MSF story too.

http://www.amazon.com/exec/obidos/ASIN/0671877895/ref=rm_item

The other references I remember for hostile plants and
biospheres are 'Surface Action' by the same Mr D and the 
Deathworld series of books by Harry Harrison (sadly both 
out of print)

-= tim jones =-