The ornamental design for a portable tissuedispenser, as shown and described.
FIG. 1 is a top, front and left side perspective view of a portable rolled
tissue dispenser showing my new design, the broken-line disclosure of a
tissue roll being for illustration purposes only and forming no part of
the claimed design;
FIG. 2 is a reduced top plan view thereof;
FIG. 3 is a reduced front elevational view thereof; and,
FIG. 4 is a top, front, and left side perspective view thereof, the
dispenser being shown without the rod for holding the tissue roll.