The Encyclopaedia Britannica; .. A dictionary of arts, sciences and general literature . n of generations,,ia well seen. The number of such generatioas varie* 160 BOTANY [nEPRODUCTIVE OBOAMfc Amongst Ferns the oospore germinates and produces anasexual generation. The embryo plant formed from thissporo is a simple mass of cellular tissue, no cotyledonsucmg formed. This, then, is an Acotykdonous embryo(fig. 64). The same happens in other vascular Crypto-gams, which are therefore also Aootyledonous. The embi-yoBO formed has a primary meristem, with an apical cell,by division of which it increases
The Encyclopaedia Britannica; .. A dictionary of arts, sciences and general literature . n of generations,,ia well seen. The number of such generatioas varie* 160 BOTANY [nEPRODUCTIVE OBOAMfc Amongst Ferns the oospore germinates and produces anasexual generation. The embryo plant formed from thissporo is a simple mass of cellular tissue, no cotyledonsucmg formed. This, then, is an Acotykdonous embryo(fig. 64). The same happens in other vascular Crypto-gams, which are therefore also Aootyledonous. The embi-yoBO formed has a primary meristem, with an apical cell,by division of which it increases in size,—roots beingformed downwards and a leaf-beariiig axis upwards, upon?which, eventually, the \. (fig. 341) is in Ferns of the production of either stalkedor sessile spore-cases or sporangia, from the epidermison the back (Aspidium) or edges (PterLs) of a leaf (frond),or upon a special branching (Osmunda), or a spicateone (Ophioglossum). These, when situated on the frond,are arranged in definite clusters or sori (fig. 342), either.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectencyclo, bookyear1902
