Ginkgo post-nuclear winter?
(via hqcreations)Source: marisa-ramirez
The shades of blue of the Willdenow’s Spikemoss
Selaginella willdenowii (Selaginellales - Selaginellaceae) is a species of spikemoss. Although sometimes these plants are commonly called Peacock ferns, they are not true ferns but fern-like plants or fern-allies.
It is a scrambling terrestrial plant with blue-green fronds that exhibit amazing iridescence when young, appearing to change color from different shades of blue, green and purple, depending on the light and angle, and turn pink, red and purple when exposed over time to bright sunlight. The blue leaves gradually turn to green with age or exposure to more direct light.
Transmission electron microscopy studies confirm the presence of a layered lamellar structure of the upper cuticle of iridescent leaves as being responsible for the blue iridescence. A recent research on this topic do not support the idea that iridescence in plants acts to enhance light capture of photosynthetically important wavelengths, because the reflectance of light in the range 600–700 nm is very similar for both iridescent and non-iridescent leaves.
However, it has been hypothesized some other adaptive advantages that leaf iridescence may offer, such as a visual defense against herbivores, a mechanism to protect shade-adapted plants against sun-flecks and other potentially damaging sudden high light levels, and a polarization filter enhancing orientation of photosynthetic apparatus within the cell.
Native to Myanmar, Indonesia, Malaysia and the Philippines, this species has now been naturalized in many countries after been introduced as a garden ornamental.
Photo credit: ©Driss & Marrionn | Locality: Aceh, Sumatra, Indonesia
(via plant-a-day)Source: libutron