Memoirs of the Department of Agriculture in India; Botanical Series Volume 2 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 edition. Excerpt: ...The strand of vessels (t) in the haustorium is not formed opposite to the vessels in the host's root. The cells at the side of the sucker (a) are cut off by a collapsed layer (c.l.), and they are moribund and crammed with starch. Between these cells and the inside of the wing of the host's bark there extends a broad layer of clear yellow substance (b). Near the sucker, this layer is striated and is apparently formed by the breaking down of the cells of the sucker: further out, the cells of the host evidently take part. The cells of the host's wood are filled with dark brown substance. Fig. 8. A /oui: g haustorium on Abrus yrecatorius, which has successfully entered the hostis root and yet has withdrawn itself from the woody cylinder. The whole surface (a) of this part of the haustorium is composed of glandular cells filled with typical, dense, granular protoplasm, a structure usually confined to the cells lining the lumen of the gland. This specimen, which is unique among those examined, recalls those met with in the haustoria of Santalum album on Pterolobium indicum Sant. I, fig. 34). Some of the cells are enlarged at a and b and show the position of the glairy secretion below the cuticle. Fig. 4. A haustorium attacking a root of Aerua lanata. The xylem ix) in this root is arranged in concentric bands separated by thinwalled parenchyma p). A black "secretion" separates the sucker from the host, but the section is interesting in showing that this layer is absent where the passage of fluids is taking place (a). The point of junction of the vascular systems of host and haustorium is drawn on a larger scale at a. Plate XI. An attack of Cantjera upon a root of Capparix horrida. A portion of the sucker and the end of one of the host's...