The Journal of the Linnean Society: Botany, Volumen9The Society, 1867 |
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Términos y frases comunes
ab E Acanthacea acutis æqualibus Anders antheris apice apothecia Arthonia Assam basi Bear Lake Bengalia bracteis bracteolis branches breviter Burmah Calcutt calyce Calyx Capsula Caule ciliatis clasped colour common Concan Corolla Corticolous crassit curved Distr Dovrefjeld Dunedin extus Färö fere Flores floribus flowers Folia foliis Forma gardens genera genus glabra Griffith Gum Copal herb Herbarium Hffm Hook hort Iceland inches India infundibuliformi internodes iodo Island Jerkin labellum labio lanceolatis lata leaf-climbers leaves Lecanora Lecidea Lich lichens linearibus Linn lobis longa longæ longit margine millim montibus Khasiæ ovatis paraphyses parvis Patha petiolatis petioles provincia revolving movement round Saxicolous segmentis sensitive shoot Sikkim Slave Lake Smrf species specimens spirally sporæ stamens stem stick subtus supra surface tendril-bearing tendrils Terricolous thallus Thoms Thwaites trees tubo twining plants utrinque Wall Wight young Zeylania
Pasajes populares
Página 2 - When the shoot of a Hop (Humulus lupulus) rises from the ground, the two or three first-formed joints or internodes are straight and remain stationary; but the next- formed, whilst very young, may be seen to bend to one side and to travel slowly round towards all points of the compass, moving, like the hands of a watch, with the sun.
Página 118 - During several days the tendrils or internodes, or both, spontaneously revolve with a steady motion. The tendril strikes some object, and quickly curls round and firmly grasps it. In the course of some hours it contracts into a spire, dragging up the stem, and forming an excellent spring. All movements now cease. By growth the tissues soon become wonderfully strong and durable. The tendril has done its work, and has done it in an admirable manner.
Página 94 - ... tendrils, had they not been excessively elastic, would instantly have been torn off and the plant thrown prostrate. But as it was, the Bryony safely rode out the gale, like a ship with two anchors down, and with a long range of cable ahead to serve as a spring as she surges to the storm.
Página 4 - Hop), at rates between 5 hrs. 15m. and 6 hrs. 45 m. for each revolution. The extreme tip thus made a circle of above 5 feet (or 62 inches) in diameter and 16 feet in circumference, travelling at the rate of 32 or 33 inches per hour. The weather being hot, the plant was allowed to stand on my study-table ; and it was an interesting spectacle to watch the long shoo't sweeping this grand cricle, night and day, in search of some object round which to twine.
Página 42 - I could hardly remove one from its support. On comparing a thin transverse slice of this petiole with one from the next or older leaf beneath, which had not clasped anything, its diameter was found to be fully doubled, and its structure greatly changed.
Página 107 - Plants become climbers, in order, as it may be presumed, to reach the light, and to expose a large surface of their leaves to its action and to that of the free air. This is effected by climbers with wonderfully little expenditure of organized matter, in comparison with trees, which have to support a load of heavy branches by a massive trunk.
Página 57 - Bignonia capreolata was several times shifted in position in a box where one side only was exposed to the light; in two days all six tendrils pointed with unerring truth to the darkest corner of the box, though to do this each had to bend in a different manner. Six tattered flags could not have pointed more truly from the wind than did these branched tendrils from the stream of light which entered the box. When a tendril does not succeed in clasping a support it bends downwards and then towards its...
Página 10 - Sphcerostema, and Adhatoda, so that the fork pressed on one side alone of the shoot and revolved with it ; I purposely selected some very slow revolvers, as it seemed most likely that these would profit from possessing irritability ; but in no case was any effect produced. Moreover, when a shoot winds round a support, the movement is always slower, as we shall immediately see, than whilst it revolves freely and touches nothing. Hence I conclude that twining stems are not irritable ; and indeed it...
Página 112 - If we inquire how a petiole, a branch or flowerpeduncle first became sensitive to a touch, and acquired the power of bending towards the touched side, we get no certain answer. Nevertheless an observation by Hofmeister* well deserves attention, namely, that the shoots and leaves of all plants, whilst young, move after being shaken. Kerner also finds, as we have seen, that the flower-peduncles of a large number of plants, if shaken or gently rubbed bend to this side. And it is young petioles and tendrils,...
Página 87 - one single lateral branohlet of a [dead] tendril, estimated to be at least ten years old, was still elastic and supported a weight of exactly two pounds. This tendril had five disk-bearing branches, of equal thickness and of apparently equal strength ; so that this one tendril, after having been exposed during ten years to the weather, would have resisted a strain of ten pounds.