. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. STRUCTURE OF SELAGINELLA 317 which is bridged either by strands of cortical cells, or by radially elongated endodermal cells. The roots and rhizophores are peculiar in exhibiting but a single protoxylem group. The cones, again situated at the ends of usually erect branches (Fig. 180, C), exhibit four rows of sporophylls, all of the same. Fig. 180.—A and B, Selaginelia niarlensii (original). A, Part of a plant showing the leafy shoots, the rhizophores (yh.), and the roots arising from their ends. B, Small part
. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. STRUCTURE OF SELAGINELLA 317 which is bridged either by strands of cortical cells, or by radially elongated endodermal cells. The roots and rhizophores are peculiar in exhibiting but a single protoxylem group. The cones, again situated at the ends of usually erect branches (Fig. 180, C), exhibit four rows of sporophylls, all of the same. Fig. 180.—A and B, Selaginelia niarlensii (original). A, Part of a plant showing the leafy shoots, the rhizophores (yh.), and the roots arising from their ends. B, Small part of a branch enlarged, to show the two kinds of leaves. C, Plant of S. spinosa (after Wettstein), showing two cones. D, Sporophyll, and E, foliage leaf of S. spinosa (after Hie- ronymus). .S^., sporangium. size and shape, and each with an axillarj' sporangium borne on a short stalk (Fig. 180, D, Sp. ; Fig. 181, A, E). The sporangia are of two kinds : the one kind (microsporangia), generally found towards the apex of the cone, are fiUed with numerous small microspores (Fig. 181, A, mi.) ; the other kind (megasporangia) each contain only four large megaspores (Fig. 181, A, mg.).. 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 Fritsch, Felix Eugene, 1879-; Salisbury, E. J. (Edward James), Sir, b. 1886. London, G. Bell and sons ltd.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpl, booksubjectplants
