Lichens that form a crustlike covering that is thin and tightly bound to the substrate are called crustose. It usually affects the genital and anal areas. fruticose synonyms, fruticose pronunciation, fruticose translation, English dictionary definition of fruticose. See Figure 1. Those with a flattened and crusty appearance are called crustose lichens. See more. Of or relating to a lichen whose thallus is branched and shrubby. Colors range from gray-green to bright orange-red. The thallus is complex, conspicuous and much branched. They play an important role in our natural ecosystems and can let us know when those ecosystems are in trouble. In a lichen, the mycobiont produces a thallus, which houses the photobiont. Lichens grow in many interesting forms. Crustose lichens … Lichen sclerosus (LIE-kun skluh-ROW-sus) is an uncommon condition that creates patchy, white skin that appears thinner than normal. The composite body of a lichen is called a thallus (plural thalli); the body is anchored to its substrate by hairlike growths called rhizines.There are three main lichen body types: crustose, fruticose, and foliose. Being cylindrical in cross-section, the layers from out­side are cortex, medulla (composed of algal cell and fungal mycelium) and central chondroid axis (composed of compactly arranged fungal mycelia). adj. Fruticose definition, having the form of a shrub; shrublike. Foliose lichens have raised, leaf-like lobes. They adhere to their substrate loosely. The Foliose lichen is a leafy type with rounded and teethed margin. Fruticose types have a highly branched form. Fruticose lichens have branched growths with finger or thread-like projections. Anyone can get lichen sclerosus but postmenopausal women are at higher risk. Adj. There are also many other types of lichen like “fruticose” that is a more shrubby type with rounded branches. Define fruticose. Crustose types look like a crust that has formed on a surface. It grows in odd shaped structures like gloves or threads. The internal structure of Usnea, a fruticose lichen, shows different types of orientation. Lichens are beautiful, especially when you view a lichen-drenched Douglas-fir or a colorful crust-covered cliff, and up close when viewed under a hand-lens or microscope. Some lichens have the aspect of leaves (foliose lichens); others cover the substrate like a crust (crustose lichens) (illustration, right), others such as the genus Ramalina adopt shrubby forms (fruticose lichens), and there are gelatinous lichens such as the genus Collema. Fruticose lichen characteristics: Fruticose lichens have an erect shrub-like or filamentous morphology and can be approximately 10cm high. They may be erect or hanging. They are diverse, adaptable, functional, and little understood. Foliose lichens are leaflike in both appearance and structure. 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