. The structure and development of mosses and ferns (Archegoniatae). ther-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., PI. Fig. 12) is repre- II MUSCINEJE—HEPATIC JE—M ARC 11AXTI ALES 51 sented as empty. The antheridium becomes sunk in
. The structure and development of mosses and ferns (Archegoniatae). ther-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., PI. Fig. 12) is repre- II MUSCINEJE—HEPATIC JE—M ARC 11AXTI ALES 51 sented as empty. The antheridium becomes sunk in the thallusprecisely as in Riccia. The sperm cells are nearly cubical andthe spermatozoid is formed in the usual way. The freespermatozoid (Fig. 16, D) shows al-xjut (juc ruid a hrdf com-plete turns of a spiral. The cilia are very long-, and the vesicleusually plainly evident. According to Ikeno (4), in Marclianlia polyiiiorpJia thefinal division, resulting in the pair of s])ermatids, is unaccom-panied by a division wall, and this seems also to be the case in.
Size: 2136px × 1170px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910
