. Class-book of botany: being outlines of the structure, physiology and classification of plants; with a flora of the United States and Canada. Botany; Plants; Plants. 126 THE CRYPTOGAMIA OR FLOWERLESS 511, Chara fcetida. 512, Portion of a branch ; the two reproductive organs- a, Globule; b, nucule. bearing slender, whorled, leafless branches. The mosses and Hepatiese have filiform stems and branches, erect and creeping. Fern leaves and mushrooms arise on stipes. 626. Leaves. The ferns arc characterized by their great development of leaves called fronds. They are rarely simple, often
. Class-book of botany: being outlines of the structure, physiology and classification of plants; with a flora of the United States and Canada. Botany; Plants; Plants. 126 THE CRYPTOGAMIA OR FLOWERLESS 511, Chara fcetida. 512, Portion of a branch ; the two reproductive organs- a, Globule; b, nucule. bearing slender, whorled, leafless branches. The mosses and Hepatiese have filiform stems and branches, erect and creeping. Fern leaves and mushrooms arise on stipes. 626. Leaves. The ferns arc characterized by their great development of leaves called fronds. They are rarely simple, often pinnatifid, or pin- nate, simply, doubly or triply. Their venation is fork veined and their vernation circinate. The leaves of the mosses and Hepaticae are veinlesa and delicate, mostly ovate and entire, numerously covering the axis. Those of the latter arc often garnished with stipule-like processes called am- phigastria. 627. Thallus. The vegetative system of the Thallogens consists either of delicate filaments or of flattened membranes, varying in color through every shade and hue. In Marchantia, lichens, and seaweeds it is green, olive or red, and called thallus. It may resemble a leaf or a stem, but its functions are still the same. In size it varies from the microscopic Conferva? to the gigantic seawraclc, a fur- long in length. Its structure is purely cellular and uniform, or, as in Marchantia, in layers. 628. Mycelium or spawn is the vegetative system of the Fungi, distinguished from thalli by its want of coloring matter in its cells. It consists of meshes of white or colorless filaments, branching and anas- tamosing to form entangled masses pervading the substance in which the Fungus grows. It is far less conspicuous than the fructification (toad-stool, etc.) which ultimately arises from it. 629. The reproductive organs of the Cryptogamia are the anthe- ridia and archegonia; and by their reaction spores in various spore- vessels are produced. They have been detected in
Size: 1221px × 2047px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectbotany, booksubjectplants, bookyear18
