. The structure and development of mosses and ferns (Archegoniatae). er cells, all, how^ever, unmistakably the product of a singlecell, and if a comparison is to be made with the antheridium ofany other Liverwort, the antheridium in the latter is homol-ogous, not with the single one of Anthoceros, but with thewhole group, plus the two-layered upper wall of the cavity inwhich they lie. The first divisions in the antheridium are the same as thosein the original cell, , the young antheridium is divided longi-tudinally by two intersecting walls, and the separation of the9 I30 MOSSES AND FERNS
. The structure and development of mosses and ferns (Archegoniatae). er cells, all, how^ever, unmistakably the product of a singlecell, and if a comparison is to be made with the antheridium ofany other Liverwort, the antheridium in the latter is homol-ogous, not with the single one of Anthoceros, but with thewhole group, plus the two-layered upper wall of the cavity inwhich they lie. The first divisions in the antheridium are the same as thosein the original cell, , the young antheridium is divided longi-tudinally by two intersecting walls, and the separation of the9 I30 MOSSES AND FERNS CHAP. stalk from the upper part is secondary; indeed in the earheststages it is difficult to tell whether these longitudinal divisionswill result in four vSeparate antheridia or are the first divisionwalls in a single one. Secondary antheridia arise later bybudding from the base of the older ones, so that in the moreadvanced conditions the antheridial group consists of a varyingnumber, in very different stages of development (Fig. 68, A). A /->^.--N C,.
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Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910
