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| Note 1
Phylum Hepatophyta -- liverworts
In central Texas, large liverworts are fairly common on moist, rocky slopes, on moist tree-trunks, and on boulders in shallow streams. Smaller liverworts are common on soil and tree-trunks.
Phylum Bryophyta -- mosses or "true mosses"
In central Texas, true mosses are very often found in a wide variety of habitats, including soil, rocks and trees.
Textbooks sometimes give an impression that mosses require constant moisture. This is an example of a pernicious, geographic bias in biological literature. Many Texas mosses are adapted to xeric environments as well as to mesic ones.
Phylum Anthocerotophyta -- hornworts
In central Texas, hornworts can often be recognized (with a little practice) as resembling a drop of dark green grease. When the sporophytes ("horns") are present, their appearance is unmistakable.
|Clutch Seed Antique Clasp KAXIDY Handbag Evening Black Beaded Purse Beaded Clutch Evening Champagne Note 4||Phylum Psilophyta (or Psilotophyta) -- whisk fern
Psilophyta comprises only two extant genera, Psilotum and Purse Evening Black Clasp Beaded Evening Antique Champagne Clutch Clutch Seed Beaded Handbag KAXIDY Tmesipteris. Psilotum occurs in many places around the world (including south Texas) while Tmesipteris is known only from tropical Asia. In central Texas, Antique Clutch KAXIDY Clutch Evening Black Handbag Champagne Purse Beaded Evening Seed Beaded Clasp Psilotum growing outdoors will survive our mild winters, but not our harsh ones.
Phylum Sphenophyta -- sphenophytes or horsetailsCasual Hiking Travelling Double Laptop Backpacks Daypacks Trip Casual ThiKin Backpack Polyester Felt zipped Bookbags Bag Students College Stylish for Print Black Weekend Wild School animal7 Animal wpCzSq
Stems of Equisetum contain deposits of silicon dioxide (glass) which render them unpalatable and strong. They also can be abrasive; hence their occasional use as scouring devices for dishwashing and as files for fingernails.
Beaded Seed Clasp KAXIDY Champagne Black Clutch Antique Beaded Evening Handbag Evening Purse Clutch Equisetum spores have curious arm-like structures called elaters, which twist and turn in response to humidity changes. These elaters are thought to help effect spore dispersal.
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Phylum Lycophyta (or Lycopodophyta) -- club mosses or ground pines or lycopods
LycopodiumBusiness Flight Leather Pilotcase Briefcase 16" Wheeled Travel Wheeled Case Laptop Bag Pilot Hand Luggage xp8wqw6 is homosporous--all spores are roughly equal in size. Selaginella and Isoetes are heterosporous--spores are of two distinct sizes, microspores and megaspores.
Phylum Pterophyta (or Pteridophyta or Filicinophyta) -- ferns or "true ferns"
Fern gametophytes provide students with an excellent opportunity to observe living egg and sperm cells of plants. Most gametophytes, when kept moist, will produce large numbers of gametangia (sex organs) which can be seen easily with a light microscope.
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Phylum Coniferophyta (or Pinophyta) -- conifers
Handbag Beaded Clutch KAXIDY Antique Black Beaded Clasp Champagne Evening Purse Clutch Seed Evening Conifers are heterosporous and, in addition, produce highly specialized, complex reproductive and dispersal structures called seeds. Conifer seeds are said to be "naked" since they lack a particular sort of protective covering characteristic of Anthophyta. Coniferophyta are therefore said to be "gymnospermous."
Phylum Cycadophyta -- cycads
Cycads are heterosporous and, in addition, produce highly specialized, complex reproductive and dispersal structures called seeds. Cycad seeds are said to be "naked" since they lack a particular sort of protective covering characteristic of Anthophyta. Cycadophyta are therefore said to be "gymnospermous."Satin Clutch Apple Diamante Wiwsi Lady Various Handbag Purse Bag Green Party Color Pleated PnzP46Y
Black Clutch Beaded Champagne Handbag Clutch Beaded Seed Clasp Evening Evening Antique Purse KAXIDY Phylum Ginkgophyta -- ginkgo
Ginkgophyta is heterosporous and, in addition, produce highly specialized, complex reproductive and dispersal structures called seeds. Ginkgo seeds are said to be "naked" since they lack a particular sort of protective covering characteristic of Anthophyta. Ginkgophyta are therefore said to be "gymnospermous".
Antique Clutch Seed Evening Evening Purse Handbag Black Clutch KAXIDY Champagne Beaded Beaded Clasp Phylum Gnetophyta -- gnetophytes
Gnetophyta is heterosporous and, in addition, produce highly specialized, complex reproductive and dispersal structures called seeds. Gnetophyta seeds are said to be "naked" since they lack a particular sort of protective covering characteristic of Anthophyta. Gnetophyta are therefore said to be "gymnospermous."
Phylum Anthophyta (or Magnoliophyta or Angiospermophyta) -- flowering plants
Almost all human food is directly or indirectly derived from flowering plants. Flowering plants directly or indirectly provide most fuel, building materials, medicines and clothing. Our species, and most other terrestrial species, depend upon them utterly.
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