Grand Fir ID?

RandyFulle randyfulle at aol.com
Tue Jun 9 00:23:40 EST 1998


Forest Fair,

Two species (Pseudotsuga sp. and Abies sp). If of cone bearing age you will
find that Pseudotsuga's cones have bracts with three points and are pendant
(downturning) at maturity and soon deciduous, middle scale of bract pronounedly
long. Leaves flattened, needle-like, short-petiolate, wholly deciduous and
leaving an indented scar somewhat broader than long, 1.5-3.5mm, retained 7-10
years, mostly uniformly spreading or upswept on branches, greenish on upper
surface but white-banded with stomata beneath. Abies have cones that are
upright on the stem, resinous, and leave behind a central stalk in fall after
seed dessimination. If you look in the tops of Abies sp. you will see little
dead twigs sticking straight up and scattered around on the branches. However,
Abies grandis/concolor  is green waxy above with two pale white lines on the
underside, soft to the touch. Abies leaves thin and flexible, deeply grovved
very dark green and lustrous on upper surface, silvery white on lower surface,
with two broad bands of 7-10 rows of stomata, rounded and conspicuousl
emarginate at apex, 1-1/2"-2-1/4" long, often notched at apex. Abies grandis
and Abies concolor can hybridize in the wild and you will find populations that
can best be described as Abies ConGrandis

Good Luck

Dr. Randy Fuller
Forest Pathologist



More information about the Ag-forst mailing list