R É G I F A S Z E R K E Z E T E K - Hidak és Szerkezetek Tanszéke

(a)
(a) [Left and center] — surface
view and section through bordered pits
in conducting cells; [right] - solid view
of two pits cut in half (after a woodcut
by Or L. Chalk): I, pit opening; II, torus;
III, margo strands formed from the
primary wall: IV, pit cavity; V, secondary
wall, (b) Bordered pits on the radial wall of
a softwood. The arched dome on one side has
been torn away during sample preparation
to reveal the torus and supporting margo
strands. Magnification x3000 (scanning
electron micrograph by Building Research
Establishment, © Crown Copyright)
(b)
Biológiai kártevők 1/4