The structure & development of the mosses and ferns (Archegoniatae) . f has a singlemedian vascular bundle, which does not extend to the arrangement of the leaves is usually spiral, and they areuniformly distributed about the stem, and all alike ; but in afew species, L. complanatuin, they are of two kinds andarranged in four rows, as in most species of Selaginella. Thebranching of the stem is either dichotomous or roots, which are borne in acropetal succession (Bruchmannfound also in L. inundatum adventive roots), branch dichotom- 470 MOSSES AND FERNS CHAP. ously,
The structure & development of the mosses and ferns (Archegoniatae) . f has a singlemedian vascular bundle, which does not extend to the arrangement of the leaves is usually spiral, and they areuniformly distributed about the stem, and all alike ; but in afew species, L. complanatuin, they are of two kinds andarranged in four rows, as in most species of Selaginella. Thebranching of the stem is either dichotomous or roots, which are borne in acropetal succession (Bruchmannfound also in L. inundatum adventive roots), branch dichotom- 470 MOSSES AND FERNS CHAP. ously, like those of Isoetes. The sporangia are borne singly, inthe axils of the sporophylls, which may differ scarcely at allfrom the ordinary leaves (Z. selago, L. luciduhwi), (Fig. 248),or the sporophylls are different in form and size from the otherleaves and form distinct strobili, which are often borne at theend of almost leafless branches (Fig. 243). None of the investigated species of Lycopodium show adefinite initial cell at the apex of the stem, and Treub ^ was. B
Size: 2044px × 1222px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookidstructuredev, bookyear1895
