. The British Charophyta. Characeae. III. IV JTiQ. 18.—Development of antheridium of Nitella fiexilis (after Sachs), i. Early stage showing young antheridium divided into eight equal parts by the growth of two vertical walls, at right angles to one another, and a horizontal wall. ii. Further stage showing each eighth part divided into an exterior and interior portion, iii. Later stage showing interior portion again divided, making three layers, the outermost expanding tangentially to form the plates or shields, the middle growing radially to form the mauubria, and the inner- most forming the h
. The British Charophyta. Characeae. III. IV JTiQ. 18.—Development of antheridium of Nitella fiexilis (after Sachs), i. Early stage showing young antheridium divided into eight equal parts by the growth of two vertical walls, at right angles to one another, and a horizontal wall. ii. Further stage showing each eighth part divided into an exterior and interior portion, iii. Later stage showing interior portion again divided, making three layers, the outermost expanding tangentially to form the plates or shields, the middle growing radially to form the mauubria, and the inner- most forming the head-cells which bear the filaments, iv. Section of antheridium at still later stage showing further development of parts, a, cell which in ii-iv divides into (b) flask-cell and (c) extra basal cell; d, branchlet node; e, branchlet internode; /, lateral ray; g, young oogonium. In i-iii the protoplasm has been contracted by 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 Groves, James; Bullock-Webster, George Russell, 1858- joint author. London, The Ray society
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherlondo, bookyear1920
