. Fig. 41.—Female Cone of Pinus muricata, showing the long sharp spines which stand up from the boss or umbo in the centre of the swollen, woody, lozenge-shaped end or "apex" of each seed-scale. Compare these with the un-armed bosses in the centre of each lozenge building up the surface of the cones drawn in Figs. 31, 39, and 40. knob is elongated into a spine of nearly one-third of an inch long (Fig. 41). Theses pines are so hard and sharp that they render it impossible to grasp the cone with the hand in order to pluck it. The cones remain on the tree for fifteen years or more, and
. Fig. 41.—Female Cone of Pinus muricata, showing the long sharp spines which stand up from the boss or umbo in the centre of the swollen, woody, lozenge-shaped end or "apex" of each seed-scale. Compare these with the un-armed bosses in the centre of each lozenge building up the surface of the cones drawn in Figs. 31, 39, and 40. knob is elongated into a spine of nearly one-third of an inch long (Fig. 41). Theses pines are so hard and sharp that they render it impossible to grasp the cone with the hand in order to pluck it. The cones remain on the tree for fifteen years or more, and may be seen in close-set clusters sur- rounding quite old branches. The cones of Pinus rigida— one of the American pitch-pines—are similarly protected by spines. Pinus rigida is easily distinguished by its
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectnaturalhistory, booky
