Lichens are a type of symbiotic organism made up of a plantlike partner and a fungus. 2. In shape, the lichens are of three types: Crustose (Graphis, Lecanora)Foliose (Parmelia, Peltigera)Fruticose (Cladonia, Usnea)The bulk of lichen is formed by fungal partner or mycobiont. ... Tree diagrams. There are three major types of lichen — crustose, foliose, and fructicose — each of which has its own shape, structure, and environmental preferences. Parmelia: It is a common example of a foliose lichen which is found growing on the bark as well as the rock intermixed with the mosses at higher altitude (above 4,000 ft.). Lichen thallus which is generally "leaf-like", in appearance and attached to the substrate at various points by root-like structures called rhizines. Crustose lichens are flat, thin and without any distinct lobes. Foliose Lichens. 1. The tissues forming the thallus are arranged more or less in strata one above the other. First, you get CRUSTOSE lichen which form a thin crust on their substrate. The lichen shape is vital in lichen identification. Crustose Lichens . Example # 1. In the traditional sense of lichens, their thallus can be artificially divided into four forms: foliose, crustose and fruticose. They are usually found closely attached to stones, rocks, barks and the trunk of trees. Usnea. Therefore lichen classification is part of the subject of fungal classification. Lichens are made up of two organisms — fungus and algae — that live together as one. Haematomma puniceum and Graphic scripta are the best examples of crustose lichens. Green crustose lichens cover the basalt boulders that form the south buttress of Pollock Mountain. These are the flat coloured splotches you see on stones and tree bark (and are really hard to draw!) Foliose Lichens . The Lichen Thallus. Crustose lichen, Lecanora chlarotera . no seeds or flowers. Parmelia 2. (b) Crustose lichen: The crustose lichens, which have very poorly defined thallus, in general, have a similar structure but the development of the different layers is not so complete like that of foliose lichen. The following points highlight the two main examples of lichens. Intermediate types include leprose and squamulose lichen, among others. 12). https://www.anbg.gov.au/lichen/form-structure-reproduction.html While collecting lichens it is necessary to look for such structures with the help of hand lens. MOSS and LICHEN NATURE is NEAT raisingupwildthings.com { } CRUSTY (CRUSTOSE) LEAFY (FOLIOSE) SHRUBBY (FRUTICOSE) Some Moss Types Basic Lichen Shapes July 2004. It is generally restricted to a narrow zone below the surface. Lichens are often referred to as lichenized fungi and it is the fungal partner on which the classification of a lichen is based. Some crustose lichens belonging to family Graphidaceae bear worm like structures, which are nothing but the modified apothecia, and are called as lirellate apothecia (Fig. Lichens grow all over the world, in many different environments. This is an illustration of a crustose lichen… The examples are: 1.
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