Download The Lichen Symbiosis by Vernon Ahmadjian PDF
By Vernon Ahmadjian
Not just a useful connection with what's recognized approximately lichen bionts and their interactions but additionally a advisor to destiny experiences. Compares numerous features of lichen-forming bionts with these of different fungi, algae and cyanobacteria. good points in-depth descriptions of tradition tools. comprises over one thousand references representing a selective sampling in such topics as pollution, photosynthesis and breathing.
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Extra info for The Lichen Symbiosis
Example text
The most logical method is by pycniospores. These small, variably shaped spores are produced in large quantities by lichens . They are contained in flask-shaped structures called pycnidia which are associated closely with the fruiting bodies. Pycnidia usually are immersed in a thallus, and their openings appear as brown or black dots scattered over the surface of a lichen [194]. Pycniospores may act as male gametes which fuse with the trichogyne, an extension of the ascogonium or female reproductive part of a lichen fungus.
The pseudoparenchyma units continued to develop even after one year of culture and the beginning of further differentiation into the various Synthesis Experiments 83 thallus layers was seen. however, did not progress beyond these preliminary stages. The third step in lichen synthesis, the formation of a mature thallus, required conditions in addition to a nutrient poor substrate. One of the most important conditions was that of drying [14]. This was demonstr~tecl by another experiment. The two symbionts were fragmented togeth~r 111 a blender, and the mixture cultured for several months on an orgamc nutrient agar medium.
It is possible that the seasonal responses of a m ycobiont are supported by nutrient material wh ich accumulates either through an excess of photosynthetic products or through absorption of substances from the substrate and is stored in the medulla. Studies on polysaccharide distribution in Peltigera polydactyla showed that the medulla contained 50% more polysaccharide than the algal layer, which indicates that storage areas may exist within a lichen thallus [254, 257]. Many questions remain unanswered in our understanding of the physiological relationships of a lichen symbiosis.