. The structure and development of mosses and ferns (Archegoniatae). Fig. 48.—A, Young plant of Aneura palmata X265 (after Leitgeb); B, three views ofa young plant of Pellia calycina, X420(Leitgeb). m THE JUNGERMANNIALES loi stitute this family, differ from all other Ilepaticae in havingthe leaves radially arranged, and not showing the dorsiventralform that characterises all the others. The i)lants are com-pletely destitute of rhizoids hut ])ossess a rhizcjme-like basalpart, from which the leafy axes arise. The latter have well-developed leaves arranged more or less distinctly in three
. The structure and development of mosses and ferns (Archegoniatae). Fig. 48.—A, Young plant of Aneura palmata X265 (after Leitgeb); B, three views ofa young plant of Pellia calycina, X420(Leitgeb). m THE JUNGERMANNIALES loi stitute this family, differ from all other Ilepaticae in havingthe leaves radially arranged, and not showing the dorsiventralform that characterises all the others. The i)lants are com-pletely destitute of rhizoids hut ])ossess a rhizcjme-like basalpart, from which the leafy axes arise. The latter have well-developed leaves arranged more or less distinctly in three stem growls from a tetrahedral ai)ical cell, as in the acrog-ynous forms, but in Haploniitriinn at least the apical cell doesnot develop into an archegonium. The archegonia are in thisgenus borne at the end of ordinary shoots, but in Calobrynmthe end of the female branch becomes much broadened andthe numerous archegonia stand crowded together. In thiscase it is possible that the apical cell of the stem may finallyproduce an archegonium. Much the same differenc
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Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910
