. Bulletin. Forests and forestry -- United States. KEY TO RING-POROUS WOODS. 67 4. Pith rays fine but very conspicuous, even without magnifier. Color of heart- wood red; of sap wood pale lemon (No. 78) Honey locust. B. Pores of summer wood minute or small, in concentric wavy and sometimes branch- ing lines, appearing as finely-feathered hatchings on tangential section. 1. Pith rays fine, but very distinct; color greenish white. Heartwood absent or imperfectly developed (No. 70) Hackbkrry. 2. Pith rays indistinct; color of heartwood reddish brown ; sapwood grayish to reddish white (Nos- 62"
. Bulletin. Forests and forestry -- United States. KEY TO RING-POROUS WOODS. 67 4. Pith rays fine but very conspicuous, even without magnifier. Color of heart- wood red; of sap wood pale lemon (No. 78) Honey locust. B. Pores of summer wood minute or small, in concentric wavy and sometimes branch- ing lines, appearing as finely-feathered hatchings on tangential section. 1. Pith rays fine, but very distinct; color greenish white. Heartwood absent or imperfectly developed (No. 70) Hackbkrry. 2. Pith rays indistinct; color of heartwood reddish brown ; sapwood grayish to reddish white (Nos- 62"66) Elms- C. Pores of summer wood arranged in radial branching lines (when very crowded radial arrangement somewhat obscured). 1. Pith rays very minute, hardly visible (Nos. 58-60) Chestnut. 2. Pith rays very broad and conspicuous (Nos. 84-102) Oak. D. Pores of summer wood mostly but little smaller than those of the spring wood, isolated and scattered; very heavy and hard woods. The pores of the spring wood sometimes form but an imperfect zone. (Some diffuse-porous woods of groups A and B may seem to belong here.) 1. Fine concentric lines (not of pores) as distinct, or nearly so, as the very tine pith rays; outer summer wood with a tinge of red; heartwood light reddish brown (Nos- 71-75) Hickory. 2. Fine concentric lines, much finer than the pith rays; no reddish tinge in summer wood; sapwood white; heartwood blackish, (No. 105) Persimmon. ADDITIONAL NOTES FOR DISTINCTIONS IN THE GROl —A, black ash; B, white ash; G, green ash. The different species of ash may be identified as follows: 1. Pores in the summer wood more or less united into lines. a. The lines short and broken, occurring mostly near the limit of the rill(T (No 39) White ash. b. The lines quite long and conspicuous in most parts of the summer ' woo,i (No. 43) Green ash. 2. Pores in the summer wood not united into lines, or rarely so. a. Heartwood reddish brown and very firm (No. 40) Red ash. b. Heartwo
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