microspores and megaspores

Listing 1 - 10 from 18 for microspores and megaspores

Division Lycophyta
... at the base of leaves, and 2) two types of spores (heterosporous), microspores and megaspores, which give rise to male and female gametophytes and sperm cells with two flagella. The development of the gametophytes is described to be "endosporic", a character peculiar to the spikemosses and ...
home.manhattan.edu

Glossary
... and size of spore, viz. microspores heterospory a condition in which an organism produces two different types and sizes of spores, viz. microspores and megaspores heterotrichous (filament) a growth pattern of algae with prostrate filaments for attachment and ...
scitec.uwichill.edu.bb

Fern & Fern Allies Lab
... solution into a petri dish. (This solution simply contains inorganic salts and fungicide). Take the fern frond provided and scrape some spores from the sori onto the surface of the ... prepared slide of the Selaginella strobilus. Note the dissimilarly-sized microspores and megaspores and the ligule on each sporophyll (absent from Lycopodium and in the micrograph below only visible on the bottom right ...
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Glossary of Pollen and Spore Terminology - Part 2 (D-H)
... This term is mainly used in the description of some fossil megaspores. Halo (Erdtman, 1952; Fægri and Iversen, 1989) A clear zone around a well defined feature ... and proximal faces of the exine are different, either in shape, ornamentation or apertural system. Example: Echium vulgare (Boraginaceae). Antonym: isopolar. Heterosporous (adj.) Describing plants producing both microspores and megaspores ...
www.biol.ruu.nl

Glossary of Pollen and Spore Terminology - Part 2 (D-H)
... This term is mainly used in the description of some fossil megaspores. Halo (Erdtman, 1952; Fægri and Iversen, 1989) A clear zone around a well defined feature ... and proximal faces of the exine are different, either in shape, ornamentation or apertural system. Example: Echium vulgare (Boraginaceae). Antonym: isopolar. Heterosporous (adj.) Describing plants producing both microspores and megaspores ...
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Glossary
... and produces the female gamete(s). Megasporangium- The sporangium in which megaspores are produced; the nucellus of seed plants. Megaspore- In plants having two types of haploid spores (microspores (male) and megaspores (female)), megaspores ... microspores and megaspores), the saclike structure in which microspores are produced. Microspore- A haploid spore produced by meiosis of the microsporocyte and ...
www.na.fs.fed.us

Lifecycle of Spikemosses
... produces four haploid megaspores. Upon rupture of mature microsporangia, the small, lightweight microspores (3) are readily dispersed by air currents but the larger, heavier megaspores often remain in ... Breakdown of the parent sporophytic strobili releases the germinated megaspores (female gametophyte), and the young sporophytes soon develop a root and shoot system to become independent plants (9). ...
home.manhattan.edu

Azolla and Anaebaena Symbiosis
... transparent case. Male spores (microspores) are extremely small and are produced inside each microsporangium. Close-up view of Azolla filiculoides showing scalelike, overlapping leaves and several globose reproductive ... the male spore clusters presumably cause them to cling to the female megaspores, thus facilitating fertilization. According to some references, the universal occurrence of Anabaena ...
waynesword.palomar.edu

t
... sizes (heterosporous): minute microspores and relatively very large megaspores. Microspores produce the male antheridia and megaspores produce the female antheridia. Vegetative reproduction In addition to the sexual gametophyte-sporophyte life cycle, some of pteridophytes have developed various vegetative means of propagation to increase the extent and ...
www.anbg.gov.au

Cycad biology: Dinosaur Food and Maiden Hair
... nucellus). The megasporangium contains a megasporocyte which divides by meiosis to make four megaspores. Three degenerate, leaving one functional megaspore. The megaspore divides into a multicellular ... microspores are not shed. The spore divides to make a four-celled microgametophyte within the spore wall. This endosporic microgametophyte is called a pollen grain. The microsporangium opens and ...
www.plantapalm.com

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