. The structure and development of mosses and ferns (Archegoniatae). Fig. 15.—Fimhriaria sp. (?). A, Part of a vertical section of a young antheiidialreceptacle, showing two very young antheridia (J), X420; B-E, older stages. and lowest cell of the body of the antheridium, or the divisionsin these parts are more irregular. The separation of the cen-tral cells from the w^all is exactly as in Riccia, and the lowersegments do not take any part in the formation of the spermcells, but remain as the basal part of the wall. In Fimhriariathe top of the antheridium is prolonged as in Riccia, but inMarc
. The structure and development of mosses and ferns (Archegoniatae). Fig. 15.—Fimhriaria sp. (?). A, Part of a vertical section of a young antheiidialreceptacle, showing two very young antheridia (J), X420; B-E, older stages. and lowest cell of the body of the antheridium, or the divisionsin these parts are more irregular. The separation of the cen-tral cells from the w^all is exactly as in Riccia, and the lowersegments do not take any part in the formation of the spermcells, but remain as the basal part of the wall. In Fimhriariathe top of the antheridium is prolonged as in Riccia, but inMarchantia this is not the case. The wall cells, as the anther-idium approaches maturity, are often much compressed, butin Targionia hypophylla, where Leitgeb states that this com-pression is so great that the cells appear like a simple membrane,I found that, so far from this being the case, the cells wereextraordinarily large and distinct, and filled the whole spacebetween the body of the antheridium and the wall of the cavity,which in Leitgebs figures ((7), vi., P
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Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910
