NOVELTY - A glycoside hydrolase 61 (GH61) polypeptide comprising an amino acid sequence having at least 75% sequence homology to SEQ ID NO: 23, at least 78% sequence homology to SEQ ID NO: 24 or at least 79% sequence homology to SEQ ID NO: 25, or its fragment or variant capable of enhancing hydrolysis of cellulosic material, is new. Sequences not defined here may be found at ftp://ftp.wipo.int/pub/published_pct_sequences/publication.    USE - The polypeptide is used in enzyme preparation for processing biomass, preferably cellulosic material and in biofuel, starch, textile, detergent, pulp and paper, food, animal feed or beverage industry, bio-finishing textile materials such as fabrics or garments or yarn, biostoning of denim, and for cleaning the interior of a dish-washing machine. The cellulosic material is textile material, plants used in animal feed, or wood-derived pulp or secondary fiber (all claimed).    ADVANTAGE - The polypeptide improves fabric care properties or textile cleaning effect of a detergent composition.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) isolated polynucleotide chosen from (a) a polynucleotide comprising coding sequence of SEQ ID NO: 20, 21 or 22, (b) a polynucleotide encoding the polypeptide, (c) a polynucleotide encoding a fragment of the polypeptide encoded by a polynucleotide of (a) or (b), where the fragment is capable of enhancing hydrolysis of cellulosic material, and (d) a polynucleotide comprising a nucleotide sequence which is degenerate to the nucleotide sequence of a polynucleotide sequence of (a) or (b), or the complementary strand of such a polynucleotide; (2) vector comprising polynucleotide operably linked to regulatory sequences capable of directing expression of the GH61 polypeptide; (3) host cell comprising the vector; (4) method of producing a GH61 polypeptide, involves transforming a host cell with the expression vector encoding the polypeptide, and culturing the host cell under conditions enabling expression of the polypeptide, and optionally recovering and purifying the polypeptide; (5) enzyme preparation comprising the GH61 polypeptide; (6) method for treating cellulosic material, involves reacting the cellulosic material with a GH61 polypeptide or an enzyme preparation; and (7) an Escherichia coli strain (DSM 25497, DSM 25495 or DSM 25499). Sequences not defined here may be found at ftp://ftp.wipo.int/pub/published_pct_sequences/publication.