Sunday, May 1, 2016

Fungi Field Trip by Reylene Pineda






Figure 1: Two types of lichens that shows a mutualistic relationship with a moss. 

Displaying IMG_0600.JPG
Displaying IMG_0600.JPGThis is an example of a lichen, the white part are the leaves which is determined to be the Foliose as it has the leaf-like structure and the "witch's hair" are known to be fruitocose because it seems to have that mini-forest trend. These types of lichens shows a mutualistic relationships with another organism, the fungi offers protection of the moss and the nutrients absorbed by them while the photosynthetic organisms provides constant food supply to fungi.

Figure 2: A sick tree, it's undergrowth is dead
This tree lost its co-dominant branch due to fungal disease. The disease ate all the heartwood and made it hollow enough to fall off when the wind strike. As the fungus eats this tree, it secretes the sap (white part of the tree on figure 2) which tell us that it is a sick tree and will eventually die. This is another example of a mutualistic relationship, a fungus and a plant; where plants provide an easy access to food for fungi and plants benefits from fungi due to it's mycelia that aid in absorbing nutrients and water. However, these fungi are pathogenic and are slowly killing this tree.  D: 

Karina has touched a lot of other topics like ectomycorrhizal and other characteristics of fungi that may or may not be harmful to other organisms. I personally believe this outdoor experience is a better alternative than to stay inside a laboratory looking at slides because it helped me understand the materials better. I did not know anything about Lichens and other organisms that live in the forests but now there are more things to be curious about when hiking! I love nature and this is by far the best "lab" i've attend.

2 comments:

  1. It was amazing to see how a fungi can eat a big tree from inside and make it fall down. I think what happens is that decay fungi destroy the internal structural components such as cellulose and lignin. Then the tree trunks and limbs become unable to support their own weight and that is when it can fall. I think such fungus disease is not only common in old tree but as well as in young trees. I wonder what the cause could be? It makes since that the fungus takes over an old tree to provide opportunity for new cells to grow but the fact that the fungus can take over a young tree and make it fall is an interesting phenomenon. I will look more into it through outside research.

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  2. Hi, great descriptions of the lichen and what happened with the tree that is dying. I thought that part of her speech was very interesting as well and looking at signs for tree fungal problems will probably become second habit on hikes now.

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