In each plot, we chose canary trees that had a girth
above 60 cm (Saipunkaew et al. 2006). Since the tree
species develops buttress roots, straight tree criteria
could not be used. With eight trees on each plot, the
total number of sampled trees used in this research
was 24 canary trees. Lichens were sampled using a 32
x 20 cm2 plastic quadrat, located on the main stem or a
buttress side that were covered by many lichens. Two
quadrates were used on each tree, placed on different
sides of the tree. Every macrolichen found inside the
quadrates was observed and counted. Lichen covers
were measured by drawing the circumference of
the whole thalli that were included in the quadrates,
on a piece of transparent plastic. Sample pouches
made from paper were used to collect samples of the
macrolichens for further study. Samples were taken
as little as possible, in view of the very slow growth
rate of lichens.