. Outlines of botany for the high school laboratory and classroom (based on Gray's Lessons in botany) Prepared at the request of the Botanical Dept. of Harvard University. Botany; Botany. have water only when dew or rain falls. Other kiniLs live 111 the crevices of bark on tree trunks ; others on soil. The Sphagnum Mosses live in bogs, of which tliey sometimes form the chief vegetation. Peat from these bogs (used for fuel in some coun- tries) is to a considerable extent made up of the dead stems and leaves of these Mosses. 474. Reproduction is essentially the same ill as in Liverworts.
. Outlines of botany for the high school laboratory and classroom (based on Gray's Lessons in botany) Prepared at the request of the Botanical Dept. of Harvard University. Botany; Botany. have water only when dew or rain falls. Other kiniLs live 111 the crevices of bark on tree trunks ; others on soil. The Sphagnum Mosses live in bogs, of which tliey sometimes form the chief vegetation. Peat from these bogs (used for fuel in some coun- tries) is to a considerable extent made up of the dead stems and leaves of these Mosses. 474. Reproduction is essentially the same ill as in Liverworts. On the end of the stem, usually, at the proper sea- son archeyonia (Fig. 341) are found. An- theridia (Fig. 342) arise in a similar position; but in most species the 342. (iroupof aiitheiiilia: ((/) , i â i j? and sterile filaments ^WO kmds of Or- (/) on the end of a gans OCCUr OU dif- Moss stem. â j , , mi fereut shoots, ihe antherozoid is motile by means of two cilia, and reaches the archegonium and finally the egg cell when the plants are wet. Fertilization results, as iu Liverworts, in the production of a (usually long - stalked) sporogonium (Fig. 340). The ujjper part of tlie old archegonium may be car- ried up on the growing sporogonium as a cap (calyptra, c). The spore capsule opens for libera- tion of the spores by the displacement of a lid (^operculum, o) in most Mosses. 475. When the sj^ore germinates it gives rise, not to the Moss shoot directly, but to a mauy-branched filamentous 341. Archegonkini of a Moss: e, egg cell; n, neck; ?, lid (opening before fertil- ization). â :343. Protonenia of Moss: ft, bud of Moss shoot. â 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 Leavitt, Robert Greenleaf, 1865-1942; Gray, Asa, 1810-1888. Field, forest, and garden botany. New York, Amer
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