Pinnules poisson
Web1 Thallus regularly to irregularly pinnately to tripinnately branched; having moderately to well-developed pinnae; winged at the margin of the ultimate pinnule, unistratose alar portion more than 2 cells wide; ultimate pinnules cross-sections 3 –5 cells thick; usually on wet soil or rocks, rarely on wet decaying logs 2 WebSep 15, 2016 · A synopsis of all Neotropical species of Cyathea with bipinnate fronds is presented. This artificial group includes 27 species with entire or very shallowly lobed pinnules. The provided key includes together, for the first time, species that had been previously treated in three different genera: Sphaeropteris, Trichipteris, and Cyathea. Full …
Pinnules poisson
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WebFronds medium-sized to large, stipe base without articulation, hairy, vertically grooved above; lamina 1-4-pinnately compound, oblong to ovate-oblong; pinnules or lobes slightly oblique, acroscopic pinnule at base larger than basiscopic, usually parallel to rachis or pinna rachis, mostly triangular, rarely lanceolate, usually grayish hispid or … WebThe pinnules, which extend into the intertentacular cavity formed by the free or fused tentacles, intermesh to form a filter. Beside each pinnule base is a ciliary tract. In each intertentacular region, ciliary tracts produce a current of water… Read More
WebApr 10, 2024 · pinnule in American English (ˈpɪnjuːl) noun 1. Zoology a. a part or organ resembling a barb of a feather, a fin, or the like b. a finlet 2. Botany a secondary pinna, one of the pinnately disposed divisions of a bipinnate leaf 3. a metal plate with a small hole in it, used as a sight in a quadrant WebDec 7, 2024 · Five arms arise from the cup and bear fine side branches (pinnules) that give each arm a feather-like appearance. Although some crinoids have only five arms, in most species each arm divides one or more times near its base, so that some species have 10 arms and others as many as 180.
WebApr 3, 2024 · The fossil pinnules can be categorized into two types: asymmetrical and symmetrical. Asymmetrical pinnules are exclusively found in fossils, and two genera and … WebApr 1, 2024 · pinnule (plural pinnules) Any of the ultimate leaflets of a bipinnate or tripinnate leaf; a subleaflet. A part or an organ which resembles the barb of a feather, particularly …
WebFeb 27, 2024 · The Crinoids (Class Crinoidea) The Crinoidea – or Feather Stars and Sea Lilies – are among the most ancient of the Echinoderms. Most of them consist of a set of many branched arms, connected to a central cup-shaped body – which in some cases possesses a stalk that keeps them attached to the substrate. One group, the comatulid …
http://flora.huh.harvard.edu/china/mss/volume02/Flora_of_China_Volume_2_3_Tectariaceae.pdf helen olaussonWebThe pinnules, which extend into the intertentacular cavity formed by the free or fused tentacles, intermesh to form a filter. Beside each pinnule base is a ciliary tract. In each … helen ojiWebEach vane (also called a pinnule or pinule) has a hole, slot or other indicator through which one can view a distant object. From Wikipedia Two to four sori occur per fertile pinnule. … helen okobokekeimeiWebdivisions are called pinnules. Palmate blades have pinnae that are directly attached to the end of the petiole and extend outward from the center of the frond, extending like fingers from a person's palm. (Figure 7). Reproductive Structures and Fertile and Sterile Leaves Underneath a fern blade, you may find small helen olausson årehusWebMay 10, 2024 · Popularly known as sea lilies, crinoids are sea creatures related to the starfish, brittle stars, and sea urchins. There are about 700 species of crinoids known to … helen okohhttp://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=100603 helen olsson kauhelen oliva anthony