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The thallus of a crustose lichen is usually only discernible because of the discolouration of the substrate. Some crustose lichens have thalli consisting of scattered or loosely grouped granules. Crustose lichens differ from the leprose lichen by having an upper cortex and algal cells that are located directly beneath the cortex. The thallus 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.
Mycobilimbia australis is a crustose (crust-forming) lichen that forms a spreading, uneven, dull-coloured patch ranging from pale greyish to brownish or greenish grey. The lichen's main body takes on the texture of whatever surface it grows on and is typically dotted with small black-brown spots that are either developing or aborted reproductive structures.
A crustose lichen, Caloplaca marina. Crustose is a habit of some types of algae and lichens in which the organism grows tightly appressed to a substrate, forming a biological layer. Crustose adheres very closely to the substrates at all points. Crustose is found on rocks and tree bark. [1]
[40]: 159 Crustose and squamulose lichens lack a lower cortex, and the medulla is in direct contact with the substrate that the lichen grows on. In crustose areolate lichens, the edges of the areolas peel up from the substrate and appear leafy. In squamulose lichens the part of the lichen thallus that is not attached to the substrate may also ...
The order Pertusariales is a group of mostly lichen-forming fungi. The thallus, or lichen body, is typically crustose, meaning it forms a crust-like layer that closely adheres to the substrate. In some species, the thallus may rarely be slightly lobed or have a small, leaf-like appearance (minutely foliose). [5]
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.
Usnea filipendula – one of about 20,000 described species of lichen. The following outline provides an overview of and topical guide to lichens.. Lichen – composite organism made up of multiple species – a fungal partner, one or more photosynthetic partners, which can be either green algae or cyanobacteria, and, in at least 52 genera of lichens, a yeast. [1]