. The structure and development of mosses and ferns (Archegoniatae). 36o MOSSES AND FERNS CHAP. the Osmundaceae, the stem usually bifurcates once, into branches of equal size, which may rarely fork once more. A section of the rhi-zome (Fig. 203, B),shows a massive cortexcomposed largely of darksclerenchyma, but the in-ner cortex is parenchym-atous. The central cyl-inder is bounded by anendodermis, withinwhich are from one tofour layers of cells con-stituting the ((I), p. 7) was un-able to verify Strasburg-ers statement, that boththe endodermis and peri-cycle in Osmunda, as inthe
. The structure and development of mosses and ferns (Archegoniatae). 36o MOSSES AND FERNS CHAP. the Osmundaceae, the stem usually bifurcates once, into branches of equal size, which may rarely fork once more. A section of the rhi-zome (Fig. 203, B),shows a massive cortexcomposed largely of darksclerenchyma, but the in-ner cortex is parenchym-atous. The central cyl-inder is bounded by anendodermis, withinwhich are from one tofour layers of cells con-stituting the ((I), p. 7) was un-able to verify Strasburg-ers statement, that boththe endodermis and peri-cycle in Osmunda, as inthe other Ferns examinedby the latter ((11), ), are of cortical or-igin. Inside the pericycle isa continuous cylinder ofphloem, whose outer cellsconstitute the proto-phloem. The phloemproper consists mainly ofsieve-tubes of large sizeand with conspicuoussieve-plates upon theirlateral faces. The so-.
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