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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 ...
With the exception of calicioid lichens, lichen growth forms are based on the appearance of the thallus, which is the vegetative (non-reproductive) part of the lichen. [5] In most species, this form is determined by the lichen's fungal partner, though in a small number, it is instead the alga or cyanobacteria (the lichen's photosynthetic ...
Lichen growth forms are used to group lichens by "vegetative" thallus types, and forms of "non-vegetative" reproductive parts. 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 ...
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]
Pertusaria is a large genus of warty crustose lichens in the Pertusariaceae family. [1]: 322 The fruiting bodies are usually modified apothecia that immersed in warts on the main body with small holes for the spores to emerge, similar to ostioles, or are fully above and lecanorine (spore bearing discs surrounded by a ring of tissue similar to the tissue of the thallus.
Flavoplaca citrina is a crustose (crust-like) lichen with a yellow-green thallus (the main body of the lichen). The thallus is pulverulent (powdery) and entirely covered with granular soredia (tiny, powdery reproductive propagules). It can vary from thin to moderately thick and is usually soft.
Roccellaceae species have thalli (the main body of the lichen) ranging in form from crust-lie to bush-like . Crustose forms are often also byssoid (wispy, like teased wool). [1] The ascomata (spore-producing structures) are typically apotheciate (open, disc-like) or lirellate (elongated, slit-like).
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.