Biol 3080 Week 4- Wednesday 2/3 notes
Biol 3080 Week 4- Wednesday 2/3 notes BIOL 3040
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This 2 page Class Notes was uploaded by Casey Notetaker on Thursday February 4, 2016. The Class Notes belongs to BIOL 3040 at Clemson University taught by Christina Wells in Spring 2016. Since its upload, it has received 28 views. For similar materials see Biology of Plants in Biology at Clemson University.
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Date Created: 02/04/16
Week 4: Wednesday 2/3 Chapter 17: Seedless Vascular Plants II page 408-415 **** MEMORIZE**** 1. Club Moss: gametophyte is small and inconspicuous a. In some cases it is nonphotosynthetic, mycorrhizal and stays belowground b. In others, it is an irregular, lobed green mass c. Bisexual bears both antheridia and archegonia homosporous 2. Spike Mosses: Selaginella a. Has the most species; grow in moist places, some in deserts b. Bears microphylls and its sporophylls are arranged in strobili c. Has a small, scale-like outgrowth called a ligule near the base of the upper surface of each microphyll and sporophyll d. The gametophyte generations will stay within the spores the sporophyte will grow from the zygote, which is embedded in the female gametophyte (which is still encased in the megaspore wall) e. ** Heterosporous—with unisexual male and female gametophytes f. Sporangia of spike mosses are born on sporophylls two types i. Megasporophylls bear megasporangia that make megaspores (female) 1. Female gametophyte develops within the spore wall- as it matures, the spore wall ruptures and the gametophyte protrudes out ii. Microsporophylls bear microsporangia that make microspores (male) 1. ** male gametophytes develop within the microspore, and they lack chlorophyll 3. Quillworts: Isoetaceae a. Their sporophyte consists of a short, fleshy underground stem (corm) bearing quill-like microphylls on its upper surface and roots on its lower surface b. Each leaf is a potential sporophyll** c. Heterosporous: megasporangia on megasporophylls, micrsporangia on microphylls d. Ligule is present just above the sporangium of each sporophyll 4. Ferns a. Extremely diverse; 11,000 species b. Largest group of plants other than flowering plants (angiosperms) c. Greatest diversity found in tropics d. Mostly homosporous (except water ferns) e. *** seedless nature distinguishes them f. Different fern species have different sporangia morphologies g. Two kinds of Sporangia within the Ferns i. Eusporangia: found in Psilotopsida, Marattiopsida, and all higher vascular plants 1. Larger and have multi-layered walls (many more spores) 2. Parent cells are located at the surface of the tissue form which the sporangium is produced ii. Leptosporangia: found only in Polypodiosida 1. Smaller (fewer spores) and their cell walls are only one cell thick which divides transversely or obliquely 2. Cluster of sporangia= sorus 3. The young sori are covered by specialized outgrowths of the leaf= the indusia
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