. Elementary botany . Fig. 228. Two-celled embryo of Pteris serrulata. Remnant of archegonium neck below. and the stem curves upward between the lobes of the heart-shaped body, and then grows upright as shown in fig. 231. Usually only one embryo is formed on a single prothallium, but in one case I found a prothallium with two well- formed embryos which are figured in 232. 375. Comparison of ferns with liverworts and mosse?.—In the ferns then we have reached a remarkable condition of things as compared with that which we found in the mosses and liverworts. In the mosses and liverworts

---

Size: 2063px × 2422px
Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1800, bookdecade1890, bookpublisher, booksubjectbotany