R help - Aug 2006 - how to replace one row with other row?

I want to replace one row with other information in the dataframe. For
example:
> cb04.full[1:5,]
    tag   sp   gx   gy dbh codes status branch species lifestyle *family*genera
1 10101 COMA 1.64 1.54 1.2 10111  alive      0    $BLS?:(B      COMA   *COMA*
COMA
2 10102 COMA 2.05 2.45 1.5 10111  alive      0    $BLS?:(B      COMA   *COMA*
COMA
3 10103 ACBA 0.40 3.20 1.0 10111  alive      0  $BdHLS\e(B      ACBA   ACBA  
ACBA
4 10104 ACBA 0.46 4.45 2.5 10111  alive      0  $BdHLS\e(B      ACBA   ACBA  
ACBA
5 10104 ACBA 0.46 4.45 1.2 10111  alive      1  $BdHLS\e(B      ACBA   ACBA  
ACBA
> sp.basic[36:40,]
   ts   sp       Family    Genera
36 36 *COMA*   *Betulaceae*   Corylus
37 37 CRMA     Rosaceae Crataegus
38 38 EUAL Celastraceae  Euonymus
39 39 EUMA Celastraceae  Euonymus
40 40 EUPA Celastraceae  Euonymus


*When family="COMA" in "cb04.full", I want to replace
"COMA" in "family"
with "Betulaceae" in "sp.basic$Family".*
**
*Thanks!*

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