Analytical Keys to the Genera and Species of the Fresh Water Algæ and the Desmidieæ of the United States: Founded on the Classification of the Rev. Francis Wolle's MonographsE.F. Bigelow, 1893 - 117 pagine |
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Analytical Keys to the Genera and Species of the Fresh Water Algæ and the ... Alfred Cheatham Stokes Visualizzazione completa - 1893 |
Analytical Keys to the Genera and Species of the Fresh Water Algæ, and the ... Alfred Cheatham Stokes Anteprima non disponibile - 2018 |
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Algæ angles rounded angular Antheridia apices Aquatic arms artificial key Bambusina bands basal lobes basally inflated bifid bluish branches Cells globose Cells slightly central Chlorophyll clustered colorless constricted crenate curved cuspidate Cytioderm smooth dentate Desmids diam Diameter of filaments End lobe ends rounded Ends truncate filling the oögonium forms front view furcate fusiform gelatinous geminate granulate green Heterocysts irregularly Isthmus Jelly mass Journ long as wide longer than broad longer than wide Margins crenate Margins smooth membrane Micr moniliform mucilage mucous notched oblong obtuse oögonia oöspore Oöspores globose orbicular ovate papillæ plant punctate quadrangular radiating semi-cell semi-cell elliptical semi-cell oval semi-cells pyramidal sheath short sinus species spherical spines spinous spiral Spirogyra Spore straight Stratum striæ surface swollen tegument Thallus tufts twice as long twice longer Ulothrix undulate verrucæ verrucose wet rocks wide 66 width yellowish
Brani popolari
Pagina 94 - Cytioderm verrucose; end more or less protruding and scolloped (4-crenate) ccelatum, 86 yy. Cytioderm verrucose; end more or less protruding, not scolloped, ornatum, 82; protractum, 82 yy. " " end not protruding; semi-cell twice as long as wide, oblong-quadrangular, angles rounded, Broomei, 86 zz. Cytioderm finely granulate or punctate; semi-cells triangular, angles rounded, margins smooth Turpinii, 158 zz. Cytioderm verrucose; semi-cell subreniform, 3 times as wide as long commisurale, 83 zz. "...
Pagina 98 - Angles of end lobe and margins of basal each with 3 diverging spines, cuspidatum, 105 x. " " with short spines, margins of basal dentate or granulate abruptum 107 x. Angles of end lobe with one cusp or spine. . . . rostratum 106 y. Basal and central lobules both slightly emarginate, oblongum, 98 y. Basal lobes slightly emarginate, central obtuse, multilobatum, 98 z. End lobe columnar, margins nearly parallel, end truncate, attenuatum, 103 z.
Pagina 81 - FIG. 8. i. Cells twice broader than long, lobes not constricted (a). 1. " " " " lobes constricted near the end, constrictum.** 2. Cells twice longer than broad, in sheath or not . excavatum, 29 2.
Pagina 20 - ... observing pedestrian in the wayside lanes, beside the ditches and slow brooks. As soft emerald clouds, or graceful streamers floating in the sluggish current, or resting like a green scum on the surface, they are readily seen and as easily gathered. No collecting tools are demanded for either Algae or Desmids, except a dipper of some kind, a common tin dipper is as good as...
Pagina 78 - claspers' across the sutures Onychonema, 9 c. Without 'claspers;' cells united by a narrow isthmus, Sphcerozosma, 8 d. Band not twisted; cells with 'claspers' across the sutures, Onychonema, 9 d. " " cells without 'claspers
Pagina 81 - Cells united by their entire end margins (£). a. Cells united by the outer portions of the ends (d). b. Cells nearly twice as long as broad longatum, 26 b. Cells less than twice as long as broad (c). c. Cells in side view quadrate . quadratum, 26; quadrangulatum, 27 c.
Pagina 107 - Semi-cells twisted; 2-3 times longer than wide, elliptic or oblong, altcrnans, 128 //. Semi-cells not twisted (mm). mm. Front view ends concave; end view angles rounded, » striolatum, 126 mm. " " end view angles acute, Pringlei, 132 mm. Front view ends convex; end view angles crenate, sides smooth, crenatum, 126 mm. " " end view angles not crenate, somewhat truncate ,. . . . dilatatum, 128 mm.
Pagina 104 - Rotula, 135 h. Arms truncate, oblique, geniculate, short; end view 4-radiate, inconspicuum, 125 h. Arms acute or aculeate, curved; end view 3-radiate . sudeticum* i. Ends separated by a more or less elongated isthmus (_/).
Pagina 103 - Sides not constructed; diameter -s^0 to yj-j in. (75-83/1), grandc, 120 & " " " diameter ¥J¥ in. (6o/<) . . . inerme 122 c. Angles mucronate (d). c. Angles aculeate, spinous, awned or notched (e). d. Mucros double on basal angles, none on the end in front view; semi-cells truncated triangles paniculosum, 124 d. Mucros single on all angles, horizontal; diameter less than y^ in.
Pagina 106 - End view, sides straight, angles 3-4 spinous,, polymorphum, 126 dd. " sides concave; arms long, straight, in front view diverging paradoxum, 129 dd. End view, sides concave; arms short, Haabceliense, 131; nanum, 138 dd. " sides convex; arms short, tumid at base, Heleanum, 133 ee.