Study Set Content:
21- Flashcard

whisk ferns scientific name


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22- Flashcard

Loosely resemble small, green whisk brooms. Exactly where these plants fit in the Plant Kingdom is not clear.

Division Psilophyta (The Whisk Ferns

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23- Flashcard

They have been associated with a number of extinct plants called (blank) that flourished perhaps 400 million years ago


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24- Flashcard

consist almost entirely of dichotomously forking (evenly forking) aerial stems and are unique among living vascular plants in having neither leaves nor roots.

o Psilotum sporophytes

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25- Flashcard

are tiny, green, superficially leaflike, veinless, photosynthetic flaps of tissue, are spirally arranged along the stems


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26- Flashcard

Division Psilophyta Photosynthesis takes place in the outer cells of the stem

epidermis and cortex

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27- Flashcard

Sporangia that are fused together in threes and resemble miniature yellow pumpkins are produced at the tips of very short, stubby branches in the upper parts of the angular stems

Immature sporangium

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28- Flashcard

lack pigmentation, no chlorophyll and absorb their nutrients via onecelled, rootlike rhizoids aided by mycorrhizal fungi.

Gametophytes of whisk ferns

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29- Flashcard

he oldest plant known to have had xylem


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30- Flashcard

One group of these fossil plants, of which (blank)  are examples had naked stems (no photosynthetic flaps) and terminal sporangia

Cooksonia and Rhynia

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31- Flashcard

second group of fossils ad somewhat rounded sporangia produced along the upper parts of naked stems


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32- Flashcard

Whisk ferns are of little economic importance?


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33- Flashcard

Their spores have a slightly oily feel and were once used by Hawaiian men to reduce loincloth skin irritations. Hawaiians also made a laxative liquid by boiling this plants in water

Whisk ferns

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34- Flashcard

number of  known species of club mosses


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35- Flashcard

mostly look enough like large true mosses that the Swedish naturalist (blank) lumped both together in a single class.


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36- Flashcard

number of genera of club mosses

two major genera and two minor genera of club mosses.

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37- Flashcard

two major genera of lycophyta

Lycopodium, with about 50 species, and Selaginella, with over 700 species

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38- Flashcard

Ground Pines


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39- Flashcard

often grow on forest floors. They are sometimes called ground pines, partly because they resemble little Christmas trees, complete with “cones” that are upright or, in a few species, hang down


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40- Flashcard

height of ground pines

less than 30 centimeters (1 foot) tall, although some tropical species grow to heights of 1.5 meters (5 feet) or more

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