. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. Fig. 145.—Part ot a vascular bundle from the petiole of B. Virginianum, X245; xy, xylem; ph, phloem; s, s, sieve-tuhes; B, two sieve-tubes in longitudinal section, X490; sp, sieve-plates; n, nuclei. easily demonstrated. According to Janczewski (4) these pits do not penetrate the membrane between the cells, but Russow's (5) assumption that there is direct communication between the cells is correct, although difficult to prove. Russow also states that callus is present in the sieve-plates of Bqt

---

. The structure and development of mosses and ferns (Archegoniatae). Plant morphology; Mosses; Ferns. Fig. 145.—Part ot a vascular bundle from the petiole of B. Virginianum, X245; xy, xylem; ph, phloem; s, s, sieve-tuhes; B, two sieve-tubes in longitudinal section, X490; sp, sieve-plates; n, nuclei. easily demonstrated. According to Janczewski (4) these pits do not penetrate the membrane between the cells, but Russow's (5) assumption that there is direct communication between the cells is correct, although difficult to prove. Russow also states that callus is present in the sieve-plates of Bqtrychium, although poorly developed. According to Janczewski the pores are not confined to the transverse walls, but may also occur, but much less frequently, in the longitudinal walls. The contents of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Campbell, Douglas Houghton, 1859-1953. New York, The Macmillan Company;

---

Size: 1678px × 1490px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookauthorcampbelldouglashought, bookcentury1900, bookdecade1910