An Introduction to BotanyLongman, 1839 - 594 páginas |
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Página 260
... sporangia burst with elasticity by aid of their ring , and emit minute particles named spores or sporules , from which new plants are produced : as from seeds , in vegetables of a higher order . Interspersed with the sporangia are often ...
... sporangia burst with elasticity by aid of their ring , and emit minute particles named spores or sporules , from which new plants are produced : as from seeds , in vegetables of a higher order . Interspersed with the sporangia are often ...
Página 261
... sporangia are seated within the dilated cup - like extremities of the lobes of the frond , and are attached to the vein which passes through their axis , which is then called their receptacle . In Gleicheni- aceæ , the sporangia have a ...
... sporangia are seated within the dilated cup - like extremities of the lobes of the frond , and are attached to the vein which passes through their axis , which is then called their receptacle . In Gleicheni- aceæ , the sporangia have a ...
Página 262
... sporangia , thecæ , folliculi , or involucra , which dehisce longitudinally inwards . In these sporangia are contained two sorts of granules ; the one very minute and lying irregularly among a larger kind , wrapped in two filaments ...
... sporangia , thecæ , folliculi , or involucra , which dehisce longitudinally inwards . In these sporangia are contained two sorts of granules ; the one very minute and lying irregularly among a larger kind , wrapped in two filaments ...
Página 264
... ( sporangia , Martius ) , containing only one grain in Salvinia , and from six to nine in Azolla . The integument of these cases is thin , reticulated , brownish , and does not swell in water like that of true Marsileaceae : the pedicle ...
... ( sporangia , Martius ) , containing only one grain in Salvinia , and from six to nine in Azolla . The integument of these cases is thin , reticulated , brownish , and does not swell in water like that of true Marsileaceae : the pedicle ...
Página 266
... sporangium , theca , or capsule , which is a hollow urn - like body , containing sporules : it is usually elevated on a stalk , named the seta , with a bulbous base , surrounded by leaves of a different form from the rest , and ...
... sporangium , theca , or capsule , which is a hollow urn - like body , containing sporules : it is usually elevated on a stalk , named the seta , with a bulbous base , surrounded by leaves of a different form from the rest , and ...
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Palavras e frases frequentes
Adolphe Brongniart albumen anther apex appears axis bark base become body botanists Botany bracts branches buds bundles called calyx Cand Candolle carbonic acid carpels cause cavity cells cellular tissue centre chalaza character cloth colour common consists containing corolla cotyledons cyclosis developement dicotyledons direction disk Dutrochet Edition embryo epidermis exist extremity fibres filament fleshy flowers fluid foramen fruit glands grains green growing hairs hilum inches integument kind latex layers leaf leaflets leaves light Linnæus lobes Loudon margin matter medullary rays membrane Mirbel monocotyledons nature nitrogen nucleus observed organs ovarium ovary ovule oxygen parenchyma pericarp petals petiole pistil pith placenta plants Plate plumula pollen pollen tube produced quantity radicle Raphides remarked roots round seeds separate side species specimens spiral vessels stamens stem stigma stomates structure substance surface term terminating tion tree tubes vascular vegetable veins wood woody tissue yellow