Memoirs . except their outerwalls, forming a continuous cavity, the terminal one becoming narrower distally, and forming theefferent chamber and neck; while the position of the basal one is occupied by the upward growingnecks of the individual antheridial colls. Meantime the lower cell, shown in b, separates distallyand obliquely a smaller cell, d, and its extension, which lies beside the latter, is in turn cut off,thus forming three cells, of which the lower forms the antheridial stalk-cell; while the two aboveit are either transformed directly to antheridial cells, as in D. Thaxteri, figure
Memoirs . except their outerwalls, forming a continuous cavity, the terminal one becoming narrower distally, and forming theefferent chamber and neck; while the position of the basal one is occupied by the upward growingnecks of the individual antheridial colls. Meantime the lower cell, shown in b, separates distallyand obliquely a smaller cell, d, and its extension, which lies beside the latter, is in turn cut off,thus forming three cells, of which the lower forms the antheridial stalk-cell; while the two aboveit are either transformed directly to antheridial cells, as in D. Thaxteri, figure 219, or under) ifurther division, e, which may result in the production of as many as five, or, in some cases,possibly six antheridial cells, from some or all of which smaller basal cells may or may not beseparated, /. In my original description of D. africanus, the type of the genus, I stated that the numberof antheridial cells was six; but a reexamination of fresh material has led me to question whether.
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Keywords: ., bookauthoramer, booksubjectarts, booksubjectscience, bookyear1783
