. Plant studies; an elementary botany. Botany. Fig. 310. Pinus sylvestris, showing mature cone partly sectioned, and showing car- pels (sg, sg1, sq2) with seeds in their axils (g), in which the embryos (em) may he distinguished ; .-1. a young carpel with two megasporangia ; _B, an old carpel with mature seeds (chi, the micropyle being below (Ji\— After Besset. the well-known cones so characteristic of pines and their allies (Fig. 308, a, b, c). Each sporophyll is somewhat leaf-like, and at its base upon the upper side are two megasporangia (Fig. 310). It is these sporangia which are peculiar i
. Plant studies; an elementary botany. Botany. Fig. 310. Pinus sylvestris, showing mature cone partly sectioned, and showing car- pels (sg, sg1, sq2) with seeds in their axils (g), in which the embryos (em) may he distinguished ; .-1. a young carpel with two megasporangia ; _B, an old carpel with mature seeds (chi, the micropyle being below (Ji\— After Besset. the well-known cones so characteristic of pines and their allies (Fig. 308, a, b, c). Each sporophyll is somewhat leaf-like, and at its base upon the upper side are two megasporangia (Fig. 310). It is these sporangia which are peculiar in each producing and retaining a solitary large megaspore. This megaspore resembles a sac-like cavity in. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Coulter, John Merle, 1851-1928. New York, D. Appleton and Company
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