File:Mosses with hand-lens and microscope - a non-technical hand-book of the more common mosses of the northeastern United States (1903) (14579909418).jpg

Identifier: mosseswithhandl00grou (find matches)
Title: Mosses with hand-lens and microscope : a non-technical hand-book of the more common mosses of the northeastern United States
Year: 1903 (1900s)
Authors: Grout, A. J. (Abel Joel), b. 1867
Subjects: Mosses
Publisher: New York : A. Grout
Contributing Library: Robarts - University of Toronto
Digitizing Sponsor: University of Toronto

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scularbundles so characteristic of the higher plants, but in many species thestem possesses a well - marked central strand of narrow elongated cells,which serve to carry water lengthwise through the stems. This centralstrand is usually correlated with the presence of a costa in the leaf, butthere are some cases where one is present and the other lacking. In manycases the central strand is continued into the costa in the same manner thatthe vascular bundles of the higher plants are continued into the midribs ofthe leaves. The other tissues, shown in Fig. 14 of the glossary, are characteristicof all moss stems, although the outer layers are often reduced in number orin thickness of cell-wall. The moss plant, as here described, is the gametophyte, or sexual gener-ation, corresponding to the prothallial stage of the fern, and, like the fernprothallus, bearing archegonia and antheridia. These are usually borne inclusters, surrounded by leaves. The plants may be either monoicous ordioicous.
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PLATE III LIFE-HISTORY AND STRUCTURE 21 In nearly all the mosses excepting Sp/uii^uiiin and the Pleurocarpi, thearchegonia and usually the antheridia are borne at the ends of the stems. Butin the Pleurocarpi they are borne in axillary buds, or short branches, whichare often called flowers, as are also the terminal clusters of reproductive organsin the other mosses. The egg-cell in the archegonium is fertilized by an antherozoid swim-ming in the dew or rain to the archegonium and down its neck, just as in theferns. After fertilization, the egg grows in a manner similar to that in the ferns, byabsorbing nutrition from the gametophyte; but, unlike the fern, the sporophytedeveloped from this fertilized egg is almost entirely dependent on the game-tophyte for its nutrition during its entire existence, and might almost be saidto be parasitic upon it. These actively swimming antherozoids are extremely interesting microscopicalobjects under the higher powers, 400 to 500 or more diameters, but

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