Lichen

F lichen
Difficulty	1
Attacks	Touch sticky

F lichen
Difficulty	1
Attacks	Touch sticky
Base level	0
Base experience	4
Speed	1
Base AC	9
Base MR	0
Alignment	0 (neutral)
Frequency (by normal means)	Common
Genocidable	Yes
Weight	20
Nutritional value	200
Size	Small
Resistances	None
Resistances conveyed	None
A lichen: does not breathe. cannot pick up items. has no eyes. has no limbs. has no head. is mindless. does not eat. (*) is neither male nor female. is normally generated hostile.
Reference	monst.c#line1397

A lichen (not to be confused with a lich) is one of the easiest monsters in the game. They are extremely slow and incapable of dealing any actual damage; main attack is to hold you in one place, but this is trivial considering they are easy to beat.

Lichen corpses are not considered meat and, unlike most corpses, never rot.

Encyclopedia entry

The chamber was of unhewn rock, round, as near as might
be, eighteen or twenty feet across, and gay with rich
variety of fern and moss and lichen.  The fern was in
its winter still, or coiling for the spring-tide; but
moss was in abundant life, some feathering, and some
gobleted, and some with fringe of red to it.
        [ Lorna Doone, by R.D. Blackmore ]