moss genus

NOUN
10 LETTERS · STARTS WITH M

moss genus is a valid 10-letter word worth 12 points in Scrabble and 16 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
M3O1S1S1G2E1N1U1S1
3 + 1 + 1 + 1 + 0 + 2 + 1 + 1 + 1 + 1 =12 PTS
DOUBLE WORD → 24TRIPLE WORD → 36
MEANING

What does moss genus mean?