The ferns of Britain, and their allies. Comprising Equisetaceae, Filicaceae, Lycopodiaceae, marsileaceae. Forming the fourth volume of Florigraphia Britannica / by Richard Deakin.

  • Deakin, Richard, 1808-1873.
Date:
1848
Catalogue details

Licence: Public Domain Mark

Credit: The ferns of Britain, and their allies. Comprising Equisetaceae, Filicaceae, Lycopodiaceae, marsileaceae. Forming the fourth volume of Florigraphia Britannica / by Richard Deakin. Source: Wellcome Collection.

    127/200 (page 95)
    transverse section of the stem, showing five bundles of ducts, which run through its whole length to the pinnules. The vernation of this plant is extremely beautiful; it arises from the rhizoma, closely curled inwards; hut when it is more expanded, it droops backward, while the extremity still retains its tendency to curl inwards, thus forming a double curve, and having a most graceful appearance. 3. P. angula're, Newman. (Fig. 1604.) Angular pinnated Fern. Frond bi-pinnate, lanceolate; pinnae lanceolate; pinnules ovate lanceolate, obtuse, all stalked, (except a few at the point), and auricu- lated on the upper side at the base, and all standing at an obtuse angle with the mid-rib of the pinna. Newman’s British Ferns, p. 173.—Aspidium angulare.—English Botany, t. 2776.—Hooker, British Flora, ed. 4. vol. i. p. 384.— English Flora, vol. iv. p. 278. jRoot long, strong, tough. Rhizoma large, thick tufted, and thickly clothed with large brown membranous lanceolate scales, and very numerous small ones. The stem of variable length, mostly about one-fourth the length of the frond, thick and channeled above, very scaly, as well as the rachis. The frond gracefully drooping, from one to three feet long, of a lanceolate form, bi-pinnate. The pinna linear lanceolate, or lanceolate pinnate, the lower ones standing at right angles with the stem, the upper curving towards the point, a bright shining green on the upper side, pale dull greyish green beneath, and more or less scattered over with slender hair-like scales, as well as the main rib ; but not unfrequently the rachis is very scaly, and the mid-rib of the pinna and pinnules quite smooth. The pinnules are ovate lanceolate, arising at a more obtuse angle from the mid-rib than in the last species ; sometimes they stand at almost a right angle, at others a very acute, auricled on the upper side at the base, which is, however, very variable in size; occasionally it is deeply cut to the mid-rib, and this accompanied with the deep cut teeth, as in fig. g, page 92, it becomes almost pinnated, but usually they are of the form of fig. h, i, j, page 92. The teeth are pointed with soft slender bristles, or hairs, not rigid, and spiny, as in the last species. The terminal bristle of the pinnule and the auricle is the strongest; the upper pinnule of each pinnse is larger than the others, but rarely so large as in P. aculeatum, and often it is scarcely larger than the one next it. The mid-vein is waved, and terminates in the apex; the lateral veins arise alternately, are mostly forked, sometimes three