Fig. 7.

Light micrographs of endophytic filaments of A. douglasii in preformed leaves and bud scales of longitudinal sections of Pseudotsuga menziesii. (A) Uniseriate filament in a preformed leaf of a dormant bud. (B) Oblique section of a uniseriate filament in a bud scale of an actively growing early summer bud. Endophyte cells are indicated by the arrow. (C) Preformed leaf of a dormant bud illustrating the presence of two uniseriate filaments (arrows) and initiation of branching (asterisk). Scale bars = 50 μm.