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allied Angiosperms animals aquatic Arctic areas Bacteria benthic boreal Brown Algae cells Chapter characteristic chiefly climatic commonly Conifers consequently considerable crops cultivated deciduous desert developed Diatoms dicotyledonous dispersal disseminules distribution dominants ecological edaphic effective environment epiphytes example extensive factors favourable flora flowering plants fossil fruits Fungi gametophyte germination Grasses grasslands green Green Algae groups grow growth Gymnosperms habitats herbs higher plants important indicated instances lakes land largely least leaves less Lichens life-forms limited living lower luxuriant materials metres migration Mosses mountains nature normally North America northern numerous occur organisms particular photosynthesis phytoplanktonic plankton plant geography produce rain forest range Red Algae relatively reproduction roots salinity saprophytic season seeds showing shrubs situations soil South species spores sporophyte stems surface temperate regions temperature tend trees tropical tundra types usually various vascular plants vegetation weeds whereas widely widespread woody zone