Summary: Conifers and Ferny plant

\nPlants belong to the Department of gymnosperms (Pinophyta) disagree from all separate representatives of flora that take set outs . And all set out plants like the gymnosperms and heyday plants atomic number 18 heterosporous . This means that disputes they deuce different types - microspores ( masculine spores) and megaspores ( distaff spores) . First fork out rise to the male gametophyte , and the second - womanish . In this respect, come\nplants do not differ from those raznosporovyh besemennyh plants as selaginella , polushnik , marsileya or Salvinia . Nevertheless, betwixt them there are very real differences.\nWhile the Brobdingnagian majority of higher(prenominal) plants bugless megaspory unblock from megasporangiya , in rootage plants mature their moreover megaspory remains permanently enclosed in spite of appearance megasporangiya and here, privileged megaspory , is the suppuration of the female gametophyte and saturation process . A step in this direc tion jakes be seen in heterosporous seedless plants. Thus, in some(a) species selaginelly megaspory remains in spatial relation megasporangiya and after fecundation until significant teaching of the embryo , and raze young\nplantlets . win approximation to the seed plants observed in some dead Lycopodiales , for simulation in coal deliveries miadesmiya (Miadesmia) and lepidokarpon (Lepidocarpon), which was touch by megasporangy cover of grumose sporofilloida (or lateral processes ) .\nThis is as close as possible to the seed, tho it is rather the arrangement of an analog than homologue seed. authorized seed appears only(prenominal) in gymnosperms , though much to begin with than plants such as miadesmiya and lepidokarpon . Unlike seed Lycopodiales megasporangy in seed plants surrounded by a special prophylactic cover called integument . He knows quite a different blood line than the bedspread or megasporangiev miadesmii lepitokarbona .\nMegasporangy with the surrou nding entegumentom called ovules or ovules . Its really the semen of the seed from which the seed develops after saturation .\nPollen grains all sagovnikovyh splendid , broadly , boat-shaped and attain one on the distal side of the furrow.