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Crustose lichen forms a thin crust adhering closely to the substratum. In some cases, this crust may be thick and lumpy, and may be detached, in part, or submerged below its surface. The thallus of a crustose lichen is usually only discernible because of the discolouration of the substrate. Some crustose lichens have thalli consisting of ...
A leprose lichen, which is typically considered to be a form of crustose lichen, is one with a powdery or dust-like appearance. Its undifferentiated thallus is an irregular mix of fungal hyphae and scattered photobiont cells, lacking a cortex or any definable layers. [6] [47] Morphologically, it is the simplest growth form. [48]
Pyrenula cruentata is a species of corticolous (bark-dwelling), crustose lichen in the family Pyrenulaceae. The lichen, characterized by its crimson-colored thallus and perithecial warts, [2] has a neotropical distribution. [3] The lichen was first formally described in 1885 by Swiss botanist Johannes Müller Argoviensis as Bottaria cruentata. [4]
Arthonia radiata is a crustose lichen with an immersed thallus, often separated from its surroundings by a thin brown line.The thallus is typically pale, ranging from white to pale grey, sometimes with a brown or olive tinge, and often forms a mosaic-like pattern on its substrate.
Cryptothecia rubrocincta is a crustose lichen, because it grows in the form of a surface crust. The thallus, or body of the lichen is spread out flat and can be either tightly to loosely attached to the growing surface. It is 0.15–0.30 mm thick, and can be smooth, or have low radiating ridges.
Some lichen thalli 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. [1] Although the form of a lichen is determined by the genetic ...
Acne symptoms and signs. Acne blemishes are most common on the face, chest, back, shoulders and neck, but they can appear almost anywhere. With acne, you might have pimples, blackheads, papules ...
Buellia frigida is a species of saxicolous (rock-dwelling), crustose lichen in the family Caliciaceae.It was first described from samples collected from the British National Antarctic Expedition of 1901–1904.