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leaf blood


leaf blood
Photo Information
Copyright: pedro anahory (anahory) Gold Star Critiquer/Gold Note Writer [C: 99 W: 0 N: 229] (1377)
Genre: Plants
Medium: Color
Date Taken: 2007-01
Categories: Mountain
Camera: Canon 30D, Sigma 28-300mm
Details: Tripod: Yes
Photo Version: Original Version
Date Submitted: 2007-02-12 16:50
Viewed: 3792
Points: 4
[Note Guidelines] Photographer's Note
In botany, a leaf is an above-ground plant organ specialized for photosynthesis. For this purpose, a leaf is typically flat (laminar) and thin, to expose the cells containing chloroplast (chlorenchyma tissue, a type of parenchyma) to light over a broad area, and to allow light to penetrate fully into the tissues. Leaves are also the sites in most plants where respiration, transpiration, and guttation take place

The veins are the vascular tissue of the leaf and are located in the spongy layer of the mesophyll. They are typical examples of pattern formation through ramification. The pattern of the veins is called venation.

The veins are made up of:

xylem, which brings water from the roots into the leaf.
phloem, which usually moves sap out, the latter containing the glucose produced by photosynthesis in the leaf.
Venation (arrangement of the veins)

Palmate-veined leaf
Vein skeleton of a Hydrangea leafThere are two subtypes of venation, craspedodromous, where the major veins stretch up to the margin of the leaf, and camptodromous, when major veins come close to the margin, but bend before they get to it.

Feather-veined, reticulate the veins arise pinnately from a single mid-vein and subdivide into veinlets. These, in turn, form a complicated network. This type of venation is typical for dicotyledons.
Pinnate-netted, penniribbed, penninerved, penniveined; the leaf has usually one main vein (called the mid-vein), with veinlets, smaller veins branching off laterally, usually somewhat parallel to each other; eg Malus (apples).
Three main veins originate from the base of the lamina, as in Ceanothus.
Palmate-netted, palmate-veined, fan-veined; several main veins diverge from near the leaf base where the petiole attaches, and radiate toward the edge of the leaf; e.g. most Acer (maples).
Parallel-veined, parallel-ribbed, parallel-nerved, penniparallel veins run parallel most the length of the leaf, from the base to the apex. Commissural veins (small veins) connect the major parallel veins. Typical for most monocotyledons, such as grasses.
Dichotomous There are no dominant bundles, with the veins forking regularly by pairs; found in Ginkgo and some pteridophytes ( in wikipedia)

I used a sigma 28-300 at 300 and a close up lens 2D
tripod and natural light

Janice, Alex99 has marked this note useful
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Critiques [Translate]

  • Great 
  • Janice Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 3277 W: 148 N: 6163] (18832)
  • [2007-02-12 21:10]

HIn Pedro, you show us an attractive leaf and yoru nbotes are very interesting, thank you. The leaf if a bit over-exposed where the white is shining, but I do like its shape and coloours. TFS
Janice

  • Great 
  • Alex99 Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 4072 W: 133 N: 7096] (23735)
  • [2007-02-13 10:56]

Hi Pedro.
I like your detailed and interesting note so much. It supplements the perfect picture excellently. The subject is very nice. Reproduction of the leaves is really great. I have heard that Sigma 28-300 mm in not sharp at 300 mm. Your picture denies this opinion. Details and sharpness are amazing. Lighting (and darks) are wonderful too. In this season I shall try to use flash less often. My best wishes and TFS, dear friend.
Alexei.

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