. Studies in fossil botany . Paleobotany. STIGMARIA 243 which the principal rays occupy the meshes. Through- out almost the whole thickness of the woody zone, a regular radial arrangement of the elements prevails ; there is no sharp distinction between primary and. Fig. 98.—Stigmariaficoides. Transverse section of a small specimen. _*-, zone of wood, radially seriated throughout; c, middle cortex, only partially preserved ; pd, peri- derm ; c2, outer primary cortex ; c^t hypodermal zone of cortex ; rt, bases of rootlets; free rootlets are also shown. X 3^. From a photograph by Mr. L. A. Boodle
. Studies in fossil botany . Paleobotany. STIGMARIA 243 which the principal rays occupy the meshes. Through- out almost the whole thickness of the woody zone, a regular radial arrangement of the elements prevails ; there is no sharp distinction between primary and. Fig. 98.—Stigmariaficoides. Transverse section of a small specimen. _*-, zone of wood, radially seriated throughout; c, middle cortex, only partially preserved ; pd, peri- derm ; c2, outer primary cortex ; c^t hypodermal zone of cortex ; rt, bases of rootlets; free rootlets are also shown. X 3^. From a photograph by Mr. L. A. Boodle. Spencer Coll. r47 (now S. Coll. 146s). secondary xylem, but at the inner end of each wedge the elements are smaller and less regular than elsewhere. Good radial sections show that the spiral tracheides arc placed at the extreme inner edge of the wood, next the pith, so that centripetal wood in this form of Stigmaria was entirely absent. This is a rather surprising. 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 Scott, Dukinfield Henry, 1854-1934. London, A. and C. Black
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Keywords: ., bookcentury1900, bookdecade1900, bookpublisherlondonaandcblack
