386 BOTANICAL GAZETTE [NOVEMBER 
_ A NEW CHARACTERISTIC OF ENGELMANN SPRUCE 
In 1907 near Bernice, Mont., the writer observed a specimen of Engel- 
mann spruce (Picea Engelmanni Engelm.) with resin vesicles in the bark, 
which are so typical of the genus Abies. They are not mentioned in any 
of the descriptions of Engelmann spruce, and the character appears to have 
been entirely overlooked by botanists. It is therefore desired to direct 
attention to this noteworthy feature and place it on record. Since 1907 it 
has been observed at several places in Colorado, and is probably found every- 
where on this species of spruce. The vesicles or “blisters” are not so 
abundant or conspicuous as in the genus Abies. In a few instances they 
were found to be well developed and closely resembled the balsam blisters. 
Commonly, even when of large size, they were rendered obscure by being 
deeper in the bark. 
The only genus besides Abies previously described as having these 
vesicles is Pseudotsuga, in which they are less conspicuous than in Abies. 
To these two genera must now be added at least one species of the genus 
Picea, which shows this common character in many individuals, though 
it is rarely prominent.—E. R. Hopson, Washington, D. C. 
