By Douglas Houghton Campbell
This booklet is a facsimile reprint and will include imperfections reminiscent of marks, notations, marginalia and incorrect pages.
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Extra resources for Elements Of Structural And Systematic Botany: For High Schools And Elementary College Courses (1890)
Sample text
The antheridium consists at first of a basal cell and a terminal one. The latter, which is nearly globular, divides into eight nearly similar cells by walls passing through the centre. ). These cells, especially the outer ones, develop a great amount of a red pigment, giving the antheridium its characteristic color. The diameter of the antheridium now increases rapidly, and the central cells separate, leaving a large space within. Of the inner cells, the second series, while not increasing in diameter, elongate, assuming an oblong form, and from the innermost are developed long filaments (I, J) composed of a single row of cells, in each of which is formed a spermatozoid.
Of the latter, a familiar example is the common kelp, “devil’s apron” (Laminaria), often three to four metres in length, with a stout stalk, provided with root-like organs, by which it is firmly fastened. Above, it expands into a broad, leaf-like frond, which in some species is divided into strips. Related to the kelps is the giant kelp of the Pacific (Macrocystis), which is said sometimes to reach a length of three hundred metres. The highest of the class are the gulf weeds (Sargassum), plants of the warmer seas, but one species of which is found from Cape Cod southward (Fig.
The yellow masses are masses of antheridia; the round bodies, the oögonia. If the plants are gathered while wet, and packed so as to prevent evaporation of the water, they will keep perfectly for several days, and may readily be shipped for long distances. If they are to be studied away from the seashore, sections for microscopic examination should be mounted in salt water (about 3 parts in weight of common salt to 100 of water). If fresh material is not to be had, dried specimens or alcoholic material will answer pretty well.