Sclereids are sclerenchyma cells having thick lignified
secondary walls. Douglas-fir sclereids, also called bast fibers,
are long (1 mm in length), sharply pointed, spindle-shaped fibers
of a red-brown color. Sclereids from Douglas-fir bark and nine
other western coniferous species were examined for their morphology.
The external surface characteristics of sclereids...
The inner bark of Douglas-fir was successively extracted with ethanol-water (4:1 v/v), benzene-ethanol (2:1, v./iv), water, and 0.5% aqueous ammonium oxalate solution. The residue was reacted with acidified sodium chlorite, a commonly used reagent to separate lignin from carbohydrates. In general the reaction dissolves the lignin and leaves the carbohydrates...
The purpose of this thesis was to develop regression equations
for predicting diameter inside bark at various heights up the stem
N
for four tree species, noble fir (Abies procera Rehd.), Pacific silver
fir (Abies amabilies (Doug.) Forbes), Douglas-fir (Pseudotsuga
menziesii (Mirb.) Franco), and western hemlock (Tsuga heterophylla
(Raf.) Sarg.)....