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Journal of Paleontology: Primitive pollen cone structure in upper Pennsylvanian (Stephanian) Walchian conifers   (Site not responding. Last check: 2007-10-14) Sporophylls consist of a terete stalk and a heeled distal lamina. Sporangia are attached as a cluster on the adaxial surface of the sporophyll stalk. Sporophylls are attached to the cone axis by a narrow, petiole-like stalk (Figs. www.findarticles.com /p/articles/mi_qa3790/is_199805/ai_n8788620   (1224 words)

Selaginella Subg. Tetragonostachys in Flora of North America @ efloras.org Sporophylls differentiated from vegetative leaves, most sporophylls fertile; megasporophylls and microsporophylls same size, in 4 alternating ranks, appressed, base usually with 2 diverging flaps or auricles, auricles protecting sporangia below. Sporophylls deltate-ovate; apex keeled, strongly truncate in profile; bristle usually yellowish; margins short-ciliate to denticulate on distal 3/4. Sporophylls ovate-lanceolate to lanceolate or seldom ovate; apex attenuate or slightly keeled, not truncate in profile; bristle usually whitish transparent, seldom yellowish (in old leaves); margins short-ciliate to denticulate on proximal 1/2, lacking cilia toward apex. www.efloras.org /florataxon.aspx?flora_id=1&taxon_id=302114   (1364 words)

Anatomically preserved Cycadeoidea (Cycadeoidaceae), with a reevaluation of systematic characters for the seed cones of ... Sporophyll is large with numerous small cortical cells surrounding trace at this level. dimension paralleling the periphery of the sporophyll (Fig. on surfaces that are adjacent to a sporophyll (Fig. www.amjbot.org /cgi/content/full/89/9/1447   (5621 words)

Phycologia: Reproductive phenology of the introduced kelp Undaria pinnatifida (Phaeophyceae, Laminariales) in Tasmania, ...   (Site not responding. Last check: 2007-10-14) Sporophylls were dissected into flat-lying pieces that were scanned on a flatbed scanner with a standard metric. The dry weight of sporophylls was determined after drying for 72 h in a fan-forced oven at 60°C. As reported in Hewitt et al. However, the overall abundance of size class I sporophytes with sporophylls was very low in the late season, with a maximum of five such sporophytes in the 800 m^sup 2^ experimental area. www.findarticles.com /p/articles/mi_qa3850/is_200501/ai_n12412590/pg_2   (1514 words)

Ecological Archives M069-003 Mean size of the Macrocystis sporophyll bundle for plants in the clearing experiments of 1988-1991 and 1993-1995. Mean sporophyll reproductive condition rating of Macrocystis for plants in the clearing experiments of 1988-1991 and 1993-1995. Mean percentage of reproductive sporophyll blades per Pterygophora in the clearing experiments of 1988-1991 and 1993-1995. www.esapubs.org /archive/mono/M069/003   (305 words)

Hill, Jeffrey P.   (Site not responding. Last check: 2007-10-14) Sporophyll crosiers in Ceratopteris richardii have naked pinna meristems that can be observed non-destructively over time by sequential scanning electron microscopy (SSEM). Anatomical study of paradermal sections of the abaxial side of sporophyll pinna tips was combined with SSEM of developing organs to characterize cellular and morphological aspects of organ growth. There were common themes in the spatial arrangement of clonal cell patches at the abaxial pinna surface, although exact patterns varied within and between pinnae. www.botany.org /bsa/portland/section2/abstracts/23.shtml   (269 words)

[No title]   (Site not responding. Last check: 2007-10-14) sporophyll means a leaf that is associated with a spore. All of this occur when the ovule is attached to that modified cone leaf called a megasporophyll. The above sporophyll is not so modified, and actually looks like a leaf. homepage.smc.edu /hodson_kent/plant_growth/Life_Cycle/Gymnosperm/Cycadophyta/megasporophyll.htm   (150 words)

Juniperus Ovulate Cones   (Site not responding. Last check: 2007-10-14) The sporophyll tips or scales (those which become a tiny flap on the fruit coat) are finely toothed on the margin. The lower sporophyll pair usually has one fertile member resulting in a single-seeded berry-cone. Just after pollination the sporophylls elongate rapidly, so that the young cone becomes about twice a long as wide and looks like a tiny urn. uts.cc.utexas.edu /~harms/Fcones.html   (183 words)

[No title] The Cupressaceae have 2 to 6, while the Araucariaceae produce sporophylls with as many as 15 pollen sacs per sporophyll. In the Araucariaceae this large number of pollen sacs is accompanied by a tendency to become more radially arranged about the sporophyll. Having now considered some of the major features of the vegetative organs of the conifers, and the general organization of the ovulate and pollen cones, this laboratory will deal with the detailed morphology of the reproductive structures and the sequence of events in the reproductive cycle of Pinus. www.uleth.ca /bio/bio3560/12.htm   (1546 words)

Search Results for sporophyll - Encyclopædia Britannica In the genus Lycopodium, the sporangia are closely associated with the leaves. In some species (L. lucidulum), the sporangium-bearing leaves (sporophylls) occur in zones among the vegetative portions... The typical fern, a sporophyte, consists of stem, leaf, and root; it produces spores; and its cells each have two sets of chromosomes, one set from the egg and one from the sperm. www.britannica.com /search?query=sporophyll&submit=Find&source=MWTAB   (346 words)

Biology 203   (Site not responding. Last check: 2007-10-14) The megasporophylls of Cycas revoluta are not grouped into a compact strobilus but are loosely arranged at the crown of the megasporophyll-bearing plant and maintain a "leafy" form, with the ovules borne along the margin of the sporophyll. The ovules are not borne in strobili but occur in pairs terminally at the tips of stalks which emerge among the leaf bases. In certain unusual individuals, the collar may be expanded and blade-like, suggesting that the collar may represent the evolutionary remnant of what was an expanded sporophyll in its ancestors. www.lcsc.edu /jschultz/botlab.4.htm   (1275 words)

Lycopsids (from reproductive system, plant) --  Encyclopædia Britannica   (Site not responding. Last check: 2007-10-14) lucidulum), the sporangium-bearing leaves (sporophylls) occur in zones among the vegetative portions of the stems. In most, however, the sporophylls occur in specialized compressed stems, called cones, or strobili. Each sporophyll is associated with one yellow to orange, … www.britannica.com /eb/article?tocId=76170   (829 words)

Phycologia: Reproductive phenology of the introduced kelp Undaria pinnatifida (Phaeophyceae, Laminariales) in Tasmania, ...   (Site not responding. Last check: 2007-10-14) Zoospore release of U. pinnatifida, an annual kelp, was limited to the larger size classes of sporophytes (> 55 cm length) for most of the growing season, with the proportion of mature sporophytes increasing towards the end of the season. Small sporophytes with mature sporophylls were not observed until late in the growing season, i.e. Hypothetically, the smallest mature sporophyte would have a stipe width of 0.6 cm, corresponding to about 33 cm in total length, with a sporophyll circumference of 7.6 cm and a sporophyll biomass of 0.2 g. www.zoeticzone.com /p/articles/mi_qa3850/is_200501/ai_n12412590   (1281 words)

key to DeCew Guide browns, large genera Length of sporophylls less than five times breadth; low intertidal or subtidal Sporophylls thicker than the blade; with asymmetrical cordate base Sporophyll about as thick as blade; with symmetrical base ucjeps.berkeley.edu /guide/nbsk.html   (358 words)

Dr. Walker's Photos :: Marattia   (Site not responding. Last check: 2007-10-14) Marattia sporophyll leaflet showing vein & abaxial foliar synangium XS 600Wx400H Marattia sporophyll leaflet LS showing vein & immature synangium XS 600Wx400H transverse section of Marattia sporophyll leaflet showing vein & abaxial foliar synangium LS 600Wx250H media.humboldt.edu /dkw1/view_album.php?set_albumName=album53&page=3   (101 words)

Key to Cycad Genera   (Site not responding. Last check: 2007-10-14) Sporophyll ends not faceted, seeds attached to sporophylls by a basal Leaflets reflexed, prickles absent on petiole and rhachis Sporophylls lacking horns, leaflets with teeth or entire www.plantapalm.com /vce/taxonomy/genera.htm   (181 words)

BIL 105 - Lecture 24 A cluster of sporophylls is called a STROBILUS So a "pine cone" is actually a whorled cluster of sporophylls: each woody bract is a sporophyll that bears sporangia. Although conifers are monoecious (male and female reproductive structures are borne on a single individual), they bear separate male and female cones. fig.cox.miami.edu /Faculty/Dana/105F00_24.html   (1504 words)

Channel Islands NMS: Giant Kelp sporophyll (Mycrocystis pyrifera) Rocky reefs are important habitat types found throughout the Sanctuary. The reef provides food, shelter, and attachment sites for many seaweeds, invertebrates and fish. The reproductive blades, called sporophyll, are located near the base of the giant kelp plant (Mycrocystis pyrifera) just above the holdfast. www.sanctuaries.nos.noaa.gov /pgallery/pgchannel/habitats/habitats_10.html   (85 words)

Dr. Walker's Photos :: Angiopteris   (Site not responding. Last check: 2007-10-14) Angiopteris sporophyll pinnule XS showing abaxial foliar synangium LS 600Wx250H Angiopteris sporophyll pinnule LS showing transverse section of veins & abaxial foliar synangia 600Wx300H Angiopteris sporophyll pinnule XS showing abaxial foliar synangium LS 600Wx220H media.humboldt.edu /dkw1/view_album.php?set_albumName=album54&page=2   (100 words)

BIL 105 - Lecture 23   (Site not responding. Last check: 2007-10-14) MICROSPOROPHYLL - a sporophyll that produces male spores (microspores) MEGASPOROPHYLL - a sporophyll that produces female spores (megaspores) Flowering plants, like the ones we saw on our tour of the arboretum on Monday, have all of the above, but they are highly derived with respect to their more primitive counterparts in the ferns and even the gymnosperms. fig.cox.miami.edu /Faculty/Dana/105F00_23.html   (261 words)

NAHSTE: Letter to Leonard Cockayne from Charles Ethelbert Foweraker   (Site not responding. Last check: 2007-10-14) He describes the specimens he has collected and how he has preserved them. He states that it will be more difficult to obtain Blechnum penna marina in sporophyll form as all the plants he has seen are in circinate form. He also remarks that he will be relieved to have Saturday afternoons to himself from now on and that he has nearly finished Strasburger and his section drawings are almost complete. www.nahste.ac.uk /cgi-bin/view_isad.pl?id=GB-0248-DC-002-12-96&view=basic   (139 words)

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