Ancient Plants / Being a Simple Account of the past Vegetation of the Earth and of the Recent Important Discoveries Made in This Realm of Nature

by Marie Carmichael Stopes

Fig. 30

Tracheides.—Specially thickened cells in the parenchyma, usually for water storage, t, [fig. 30]. Compare [fig. 95], t.

Vascular Tissue

Fig. 31

Wood.—Protoxylem, tracheids and vessels, long, narrow elements, with spiral or ring-like thickenings, s¹ and s², [fig. 31]. Compare [fig. 81], A, px, for fossil.

Metaxylem, long elements, tracheids and vessels. Some with narrow pits, as t in [fig. 31]; others with various kinds of pits. In transverse section seen in [fig. 33], w, fossil in [fig. 114], w.

Wood parenchyma.—Soft cells associated with the wood, p in [fig. 31]. Fossil in [fig. 81], B, p.

Wood sclerenchyma.—Hard thickened cells in the wood.