In Other Plants

The areolas are an important modification evolution for these plants

. Give rise to spines, which are their main means of self defense and also the fact that the spines arising from them crop up rather than directly from the stem, coating provides a much more effective than in other plants.

Moreover, the areoles spines occur in many different sizes, numbers and types to suit the specific needs of each species. A typical areola can have one or more central spines long and sharp, serving as a defense. Around them there are often numerous radial spines (10 or more) smaller emerging from the edges of the areola and serve to shade the ground and retain some fresh air between them and the stem.

In Botany , a elaiforo is a secretory gland of oil , which can be either epithelial or tricomtico , found in the flowers of some families of angiosperms , such as Malpighiaceae , Scrophulariaceae , Iridaceae , Cucurbitaceae , Primulaceae , and Solanaceae . Such lipids secreted by the flowers act as attractants of insect pollinators . Representatives of several families of bees collect floral oils to add to the food of the larvae or to line the nest, including families Melittidae , Ctenoplectridae , Apidae and Anthophoridae . To collect these oils, bees have structural modifications that provide assistance for the scraping of it.

The peel (from Latin "foliate", "on pages ") means the removal or loss of leaves of a plant . It is used both to describe the loss or falling leaves as a natural part of life cycle (as is the case of deciduous tree that loses its leaves in autumn ) or due to trauma or external cause (such as dehydration , infestation of worms , Wind speed or hurricane ).

In arboriculture , the term " crust rifted "describes the natural process and condition of the peeling of the bark of a tree , typically in large pieces that can remain partially attached to the trunk until after a time completely detached by the elements of a peel eventual subsequent or more additional layers of bark. Examples of trees with exfoliating bark are "paper maple" Acer griseum , the genus Eucalyptus and several species of Betula .

The exine is the hard outer covering of grains of pollen . The drawings of the surface of the grains formed by the pollen are characteristic of each species usually used as characters for the classification of plants. The main substance that forms the exine is esporopolenina a polyterpene impervious chemical resistant. The esporopolenina is very resistant to decay and can get to give the exine last for thousands of years.

In Botany , the felodermis is a tissue that is found in the bark of woody plants, integrating the periderm , and formed from a secondary meristem called the phellogen . The felodermis consists of living cells, parenchyma , which are distinguished from the cortical parenchyma by their position in the same radial rows in which cells are cork . Generally consists of a single layer of cells (eg, lime, Tilia ) or a few (two in the case of Pelargonium and Prunus ), but in some families, for example in cucurbits , is composed of many layers of cells. Felodermis exceptionally may be formed by collenchyma ( Pachycormus ) ; in Pinus palustris stored starch and Libocedrus comprises sclerenchyma .

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by: Plumstech

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