The structure & development of the mosses and ferns (Archegoniatae) . Fig. 71.—Notothylas orbicularis {SuW.). A, Four-celled embryo ; B, C, older embryos, in longitudinalsection. The archesporial cells are shaded. A, X450; B, C, X225. and Dejidroceros, but may remain short and project but cells are characterised by abundant granular cytoplasm andconspicuous nuclei, showing that they are probably not onlyabsorbent cells, but also elaborate the food materials taken infrom the gametophyte. The gradual transition of the differen-tiated tissues above into the meristem at the base, is p
The structure & development of the mosses and ferns (Archegoniatae) . Fig. 71.—Notothylas orbicularis {SuW.). A, Four-celled embryo ; B, C, older embryos, in longitudinalsection. The archesporial cells are shaded. A, X450; B, C, X225. and Dejidroceros, but may remain short and project but cells are characterised by abundant granular cytoplasm andconspicuous nuclei, showing that they are probably not onlyabsorbent cells, but also elaborate the food materials taken infrom the gametophyte. The gradual transition of the differen-tiated tissues above into the meristem at the base, is preciselyas in Anthoceros, and sections at that point in the two generacan scarcely be distinguished from one another. The columella(in longitudinal section) in both shows four parallel rows ofcells, outside of which lies the single row of archesporial cells,and four rows of cells belonging to the wall of the capsule. As the section is examined higher up, however, there are THE ANTHOCEROTE^ 145 marked differences, especially in the divisions of the arche- KALEVIMA
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Keywords: ., bookcentury1800, bookdecade1890, bookidstructuredev, bookyear1895
