Book contents
- Frontmatter
- Contents
- CHAPTER I DROSERA ROTUNDIFOLIA, OR THE COMMON SUN-DEW
- CHAPTER II THE MOVEMENTS OF THE TENTACLES FROM THE CONTACT OF SOLID BODIES
- CHAPTER III AGGREGATION OF THE PROTOPLASM WITHIN THE CELLS OF THE TENTACLES
- CHAPTER IV THE EFFECTS OF HEAT ON THE LEAVES
- CHAPTER V THE EFFECTS OF NON-NITROGENOUS AND NITROGENOUS ORGANIC FLUIDS ON THE LEAVES
- CHAPTER VI THE DIGESTIVE POWER OF THE SECRETION OF DEOSERA
- CHAPTER VII THE EFFECTS OF SALTS OF AMMONIA
- CHAPTER VIII THE EFFECTS OF VARIOUS OTHER SALTS, AND ACIDS, ON THE LEAVES
- CHAPTER IX THE EFFECTS OF CERTAIN ALKALOID POISONS, OTHER SUBSTANCES AND VAPOURS
- CHAPTER X ON THE SENSITIVENESS OF THE LEAVES, AND ON THE LINES OF TRANSMISSION OF THE MOTOR IMPULSE
- CHAPTER XI RECAPITULATION OF THE CHIEF OBSERVATIONS ON DROSERA ROTUNDIFOLIA
- CHAPTER XII ON THE STRUCTURE AND MOVEMENTS OF SOME OTHER SPECIES OF DROSERA
- CHAPTER XIII DIONÆA MUSCIPULA
- CHAPTER XIV ALDROVANDA VESICULOSA
- CHAPTER XV DROSOPHYLLUM — RORIDULA — BYBLIS — GLANDULAR HAIRS OF OTHER PLANTS — CONCLUDING REMARKS ON THE DROSERACEÆ
- CHAPTER XVI PINGUICULA
- CHAPTER XVII UTRICULARIA
- CHAPTER XVIII UTRICULARIA (continued)
- ERRATA
- INDEX
CHAPTER XVI - PINGUICULA
Published online by Cambridge University Press: 29 August 2010
- Frontmatter
- Contents
- CHAPTER I DROSERA ROTUNDIFOLIA, OR THE COMMON SUN-DEW
- CHAPTER II THE MOVEMENTS OF THE TENTACLES FROM THE CONTACT OF SOLID BODIES
- CHAPTER III AGGREGATION OF THE PROTOPLASM WITHIN THE CELLS OF THE TENTACLES
- CHAPTER IV THE EFFECTS OF HEAT ON THE LEAVES
- CHAPTER V THE EFFECTS OF NON-NITROGENOUS AND NITROGENOUS ORGANIC FLUIDS ON THE LEAVES
- CHAPTER VI THE DIGESTIVE POWER OF THE SECRETION OF DEOSERA
- CHAPTER VII THE EFFECTS OF SALTS OF AMMONIA
- CHAPTER VIII THE EFFECTS OF VARIOUS OTHER SALTS, AND ACIDS, ON THE LEAVES
- CHAPTER IX THE EFFECTS OF CERTAIN ALKALOID POISONS, OTHER SUBSTANCES AND VAPOURS
- CHAPTER X ON THE SENSITIVENESS OF THE LEAVES, AND ON THE LINES OF TRANSMISSION OF THE MOTOR IMPULSE
- CHAPTER XI RECAPITULATION OF THE CHIEF OBSERVATIONS ON DROSERA ROTUNDIFOLIA
- CHAPTER XII ON THE STRUCTURE AND MOVEMENTS OF SOME OTHER SPECIES OF DROSERA
- CHAPTER XIII DIONÆA MUSCIPULA
- CHAPTER XIV ALDROVANDA VESICULOSA
- CHAPTER XV DROSOPHYLLUM — RORIDULA — BYBLIS — GLANDULAR HAIRS OF OTHER PLANTS — CONCLUDING REMARKS ON THE DROSERACEÆ
- CHAPTER XVI PINGUICULA
- CHAPTER XVII UTRICULARIA
- CHAPTER XVIII UTRICULARIA (continued)
- ERRATA
- INDEX
Summary
Pinguicula vulgaris.—This plant grows in moist places, generally on mountains. It bears on an average eight, rather thick, oblong, light green leaves, having scarcely any footstalk. A full-sized leaf is about 1½ inch in length and ¾ inch in breadth. The young central leaves are deeply concave, and project upwards; the older ones towards the outside are flat or convex, and lie close to the ground, forming a rosette from 3 to 4 inches in diameter. The margins of the leaves are incurved. Their upper surfaces are thickly covered with two sets of glandular hairs, differing in the size of the glands and in the length of their pedicels. The larger glands have a circular outline as seen from above, and are of moderate thickness; they are divided by radiating partitions into sixteen cells, containing light-green, homogeneous fluid. They are supported on elongated, unicellular pedicels (containing a nucleus with a nucleolus) which rest on slight prominences. The small glands differ only in being formed of about half the number of cells, containing much paler fluid, and supported on much shorter pedicels. Near the midrib, towards the base of the leaf, the pedicels are multicellular, are longer than elsewhere, and bear smaller glands. All the glands secrete a colourless fluid, which is so viscid that I have seen a fine thread drawn out to a length of 18 inches; but the fluid in this case was secreted by a gland which had been excited.
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- Insectivorous Plants , pp. 368 - 394Publisher: Cambridge University PressPrint publication year: 2009First published in: 1875