. The vegetable kingdom : or, The structure, classification, and uses of plants, illustrated upon the natural system. Fig. III. Algals.] CONFERVACEyE. 15 even asserted by M. Thuret, that in Conferva glomerata and rivularis, the spores havespecial organs of motion, of the nature of ciliae or tentacnla, and that it is by theu rapidaction tliat the spores swim so freely in fluid.—{Ihid. xix. 267.) Motions of anotherkind have been noticed in the Oscillatoiias ; and in the species called Zygnemas, theyare so extraordmary as to approach nearly to the act of eo])ulation in animals. In thelanguage of
. The vegetable kingdom : or, The structure, classification, and uses of plants, illustrated upon the natural system. Fig. III. Algals.] CONFERVACEyE. 15 even asserted by M. Thuret, that in Conferva glomerata and rivularis, the spores havespecial organs of motion, of the nature of ciliae or tentacnla, and that it is by theu rapidaction tliat the spores swim so freely in fluid.—{Ihid. xix. 267.) Motions of anotherkind have been noticed in the Oscillatoiias ; and in the species called Zygnemas, theyare so extraordmary as to approach nearly to the act of eo])ulation in animals. In thelanguage of M. Decaisne, the spores of these plants result from the couphng of two. tubes, of which one transmits to the other, bya pecuhar mechanism, the substance which itcontained, in order to fonn one or two sporesdistmct and separated by a partition, wliich isorganised after the copulation. In thiscoming together, the two tubes project onenipple from each of two opposite cells, whichby degrees touch, after which, the points ofthe nipples are absorbed, a passage establishedbetween the cells, the colouring matter of onepom-s into the other, till one of the cells iswholly emptied. Meyen states, that the red and greenSnowplants, which have been described as Confervse, and assigned to the genusProtococcus, are nothing more than the animalcules called Enchelis sanguinea, andPulvisculus. But this does not affect the genus Protococcus, which contains produc-tions respecting whose vegetable nature no doubt is entertained. Hydrodictyon utriculatum has the appearance of a green net. According to , the cells of this plant, when nearly ripe, contain a number of ac
Size: 2261px × 1105px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, bookdecade1840, bookidvegetablekingdom00lind
