The point-intercept method was employed as described in the introduction. A gridded quadrat frame was used to systematize the distribution of the points. An existing frame was modified, using nylon fishing line, to produce a two stringed 50x50 cm. quadrat frame (internally measured) with 5 x 5 cm spacing, as seen in fig. 3. The two strings provided a fixed trajectory, perpendicular to the ground, for the line, which was represented by a 0,8 cm. thick wooden rod. The frame was placed on 4 aluminum legs, with a height of app. 50 cm. Only a subsection of 25x25 cm of the frame was used for sampling.