The structure & development of the mosses and ferns (Archegoniatae) . ns The prothallia of Equisetum are usually dioecious, and, as isusual in such cases, the males are smaller and the antheridiadevelop first. The latter generally appear in about a E. tebnateia there is not so much difference in the appear- 1 Buchtien (i), p. 17. 426 MOSSES AND FERNS CHAP. ance and size of the male and female plants, and they arenot always distinguishable by the naked eye. While in thisspecies, as in others, the antheridia may form at the endsof the prothallial branches, they also may be formed upona
The structure & development of the mosses and ferns (Archegoniatae) . ns The prothallia of Equisetum are usually dioecious, and, as isusual in such cases, the males are smaller and the antheridiadevelop first. The latter generally appear in about a E. tebnateia there is not so much difference in the appear- 1 Buchtien (i), p. 17. 426 MOSSES AND FERNS CHAP. ance and size of the male and female plants, and they arenot always distinguishable by the naked eye. While in thisspecies, as in others, the antheridia may form at the endsof the prothallial branches, they also may be formed upona meristem quite like the archegonia, and are usually inthis species in groups, so that longitudinal sections showantheridia of very different ages, all evidently derived from theactivity of the meristem (Fig. 221). The development showsa close resemblance to that of the eusporangiate Ferns, andin connection with the other points in the growth of thegametophyte and sexual organs, suggest a nearer connection ofthese two groups than is usually admitted. Here, as in the.
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