NOVELTY - A composition of matter comprises plant biomass and at least one enzyme polypeptide having at least 85% amino acid sequence identity to at least one of SEQ ID NO: 1-84.    USE - The composition is useful for reducing biomass recalcitrance, for converting biomass to fuels and chemicals, and for developing transgenic plants with desired traits, e.g. herbicide resistance, insect resistance, disease resistance, and increased tolerance to environmental stress (e.g., drought). The antibodies, gene arrays, and plates are useful for testing, screening, and/or characterizing transgenic plants.    ADVANTAGE - The present invention provides improved systems and methods for reducing costs and increasing yields of cellulosic ethanol including compositions of matter comprising plant biomass and cell wall-modifying enzyme polypeptides and transgenic plants expression cell wall-modifying enzyme polypeptides.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are:    (1) a transgenic plant, the genome of which is augmented with a recombinant polynucleotide encoding at least one enzyme polypeptide linked to a promoter sequence, where the polynucleotide is optimized for expression in the plant, where the at least one enzyme polypeptide has at least 85% sequence identity to at least one of SEQ ID NO: 1-84;    (2) an expression vector comprising a nucleic acid encoding an enzyme polypeptide having at least 85% amino acid sequence identity to at least one of SEQ ID NO: 1-84;    (3) a transformed cell comprising a nucleic acid encoding an enzyme polypeptide having at least 85% amino acid sequence identity to at least one of SEQ ID NO: 1-84;    (4) a method which comprises pretreating a plant part under conditions to promote accessibility of celluloses within the lignocellulosic biomass; and treating the pretreated plant part under conditions that promote hydrolysis of cellulose to fermentable sugars, where the plant part is obtained from at least one transgenic plant, the genome of which is augmented with: a recombinant polynucleotide encoding at least one enzyme polypeptide operably linked to a promoter sequence, where the polynucleotide is optimized for expression in the plant and where the at least one enzyme polypeptide has at least 85% sequence identity to at least one of SEQ ID NO: 1-84;    (5) an isolated antibody that binds specifically to a feruloyl esterase polypeptide;    (6) an isolated antibody that binds specifically to an exoglucanase polypeptide;    (7) an array comprising a solid substrate, the substrate having a surface, and genetic probes where each genetic probe is immobilized to a discrete spot on the surface of the substrate to form an array, and where the genetic probes comprises at least ten different oligonucleotides, each oligonucleotide comprising at least ten consecutive nucleotides from a nucleic acid encoding a polypeptide have a sequence of one of SEQ ID NO: 1-84; and    (8) a plate comprising a solid substrate, the substrate having a surface, and a peptide immobilized to the surface, where the peptide comprises at least six consecutive amino acids from a polypeptide having a sequence of one of SEQ ID NO: 1-84.