An Introduction to BotanyLongman, 1839 - 594 páginas |
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Página 19
... pollen tube of Linum pallescens . In structure it is usually granular ; in consistence it varies between extreme softness and such a degree of toughness , as enables it to resist the pressure of the compressorium without altering its ...
... pollen tube of Linum pallescens . In structure it is usually granular ; in consistence it varies between extreme softness and such a degree of toughness , as enables it to resist the pressure of the compressorium without altering its ...
Página 177
... pollen into a tube opening at top , as in several Ericaceae ( Plate III . fig . 22. ) ; or in the two thecæ being confluent at the apex , and bursting by a common foramen or tube , as in Tetratheca ( see Plate IV . fig . 4. ) . In other ...
... pollen into a tube opening at top , as in several Ericaceae ( Plate III . fig . 22. ) ; or in the two thecæ being confluent at the apex , and bursting by a common foramen or tube , as in Tetratheca ( see Plate IV . fig . 4. ) . In other ...
Página 189
... tube : this phenomenon may be produced artificially at will by placing the pollen - grain in weak nitric or sulphuric acid ; but it is quite a distinct emis- sion from that of the pollen - tubes hereafter to be noticed . A third ...
... tube : this phenomenon may be produced artificially at will by placing the pollen - grain in weak nitric or sulphuric acid ; but it is quite a distinct emis- sion from that of the pollen - tubes hereafter to be noticed . A third ...
Página 191
... pollen falls upon the stigma it emits a fine transparent tube , which is a prolongation of the intine , and down which the fovilla passes until the grain is emptied . The pollen - tube thus formed was first observed by Amici , and is ...
... pollen falls upon the stigma it emits a fine transparent tube , which is a prolongation of the intine , and down which the fovilla passes until the grain is emptied . The pollen - tube thus formed was first observed by Amici , and is ...
Página 219
... pollen tube , or as being the sac of the amnios , as it surely is . He moreover finds that while all endogens have two integuments of the ovule , the majority of monopetalous exogens have but one , whilst the polype- talous usually ...
... pollen tube , or as being the sac of the amnios , as it surely is . He moreover finds that while all endogens have two integuments of the ovule , the majority of monopetalous exogens have but one , whilst the polype- talous usually ...
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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