. The structure and development of mosses and ferns (Archegoniatae). sverse and longitudinal walls succeedwith such regularity that the limits of the primary segmentsremain perfectly evident until the antheridium is nearly fullgrown. The central cells in the fresh antheridium are strongly re-fringent and in stained sections show^ a much more granularconsistence than the outer ones. The nucleus, as in other casesstudied, loses its nucleolus before the formation of the sperma-tozoids begins. The latter in their structure and developmentcorrespond with those of Sphagnum, but owing to their smalle
. The structure and development of mosses and ferns (Archegoniatae). sverse and longitudinal walls succeedwith such regularity that the limits of the primary segmentsremain perfectly evident until the antheridium is nearly fullgrown. The central cells in the fresh antheridium are strongly re-fringent and in stained sections show^ a much more granularconsistence than the outer ones. The nucleus, as in other casesstudied, loses its nucleolus before the formation of the sperma-tozoids begins. The latter in their structure and developmentcorrespond with those of Sphagnum, but owing to their smallersize are not favourable for studying the minute details of de-velopment. In the peripheral cells are numerous chloroplasts which inthe ripe lie close to the inner w^all of the cell As 198 MOSSES AND FERNS CHAP. the antheridium ripens, these gradually assume a bright orange-red colour. The development of the stalk varies in differentcases. Sometimes it consists of a row of several cells, some-times the antheridium is almost sessile. The lowermost seg-.
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Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910
