Fig. 1 (A) TEM of labellar trichome of D. unicum showing stalk cell with ‘head’ of component cells. Note that both cell types contain a nucleus (n) but whereas the stalk cell (arrow) contains dense cytoplasmic contents, the component cells have peripheral cytoplasm. Each component cell contains a single starch grain (s). Scale bar = 5 µm. (B) Detail of component cell showing peripheral cytoplasm with mitochondria (m) and plastids (p), the latter containing plastoglobuli. Spherical osmiophilic bodies (o) may also occur in the cytoplasm. Scale bar = 1 µm.