. The structure and development of mosses and ferns (Archegoniatae). Fig. 195.—A-D, Development of the antheridium of O. cinnamomea, in longitudinalsection, X42S; E, F, G, three surface views of ripe antheridia of O. Clay-toniana; E, from above, the others from the siOe; 0, opercular cell, X425. next developed in the outer dome-shaped cell two or three walls,running more or less obliquely over the apex; either at the topor at one side the last-formed wall encloses a small cell, whichis thrown off when the antheridium opens (Fig. 195, o). Thisopercular cell, both in form and position, recalls s
. The structure and development of mosses and ferns (Archegoniatae). Fig. 195.—A-D, Development of the antheridium of O. cinnamomea, in longitudinalsection, X42S; E, F, G, three surface views of ripe antheridia of O. Clay-toniana; E, from above, the others from the siOe; 0, opercular cell, X425. next developed in the outer dome-shaped cell two or three walls,running more or less obliquely over the apex; either at the topor at one side the last-formed wall encloses a small cell, whichis thrown off when the antheridium opens (Fig. 195, o). Thisopercular cell, both in form and position, recalls strongly thatfound in the Marattiaceas. The divisions in the central cell-correspond closely to thosein Onoclea, but the number of sperm cells is larger, being usu-ally 100 or more. The development is also the same, and willnot be entered into here.^ After the final division of the spermcells the nuclei remain slightly flattened in the plane of division, ^ For details see Campbell (12), p. 61, THE HOMOSPOROUS LEPTOSPORANGIATjE 353 as in the Hepaticae, and the mat
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Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910
