Trichoderma species usually form vegetative hyphae which are septated,
hyaline and smooth-walled (Rex et al., 2001; Gams and Bissett 2002).
Conidiophores (Figure 2.2) are highly branched. Lateral side branches
produced from main branches may or may not be paired, and sometimes may
rebranch. Normally, the branches will form at or near 90° with respect to the
main branch. Paired branches will assume a pyramidal structure. The typical
conidiophore terminates with one or a few phialides that usually arising
directly from the axis near the tip. In some species, however, the main
branches are terminated with sterile or fertile elongations (Samuels et al.,
2002a).