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Usnea is a genus of fruticose lichens in the large family Parmeliaceae. The genus, which currently contains roughly 130 species, was established by Michel Adanson in 1763. Species in the genus grow like leafless mini- shrubs or tassels anchored on bark or twigs.
The structure of fruticose lichens depends also on their mycobionts. [4] Lichen undergoes diffuse growth and the thallus elongates over time. [5] New branch cells grow through the wall materials of older neighboring cells. [5] [6] Microenvironmental conditions influence individual thalli and branches, causing non-uniform growth. [5]
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] The cell walls of leprose lichens contain chemical compounds which make them hydrophobic, and thus largely water repellent. However, the lack ...
A podetium (plural podetia) is a lichenized stem-like structure of an apothecium rising from the primary body of the thallus. [4] Since it is part of the reproductive tissue, it is not considered part of the thallus. [4] The podetium may be branched, and sometimes cup-like. It usually bears the pycnidia or apothecia or both.
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]
The Parmeliaceae is a large and diverse family of Lecanoromycetes.With over 2700 species [2] in 71 genera, it is the largest family of lichen-forming fungi.The most speciose genera in the family are the well-known groups: Xanthoparmelia (822 species), Usnea (355 species), Parmotrema (255 species), and Hypotrachyna (262 species).
This contagious skin rash is caused by streptococcus and staphylococcus bacteria that enter the body through compromised skin. Other symptoms to note: Initially, red blisters form at the infection ...
Parmelia species have a foliose (leafy) thallus with a substrate attachment ranging from loose to tight. The lobes comprising the thallus are rounded, more or less straight, and may be contiguous or overlapping (imbricate). The texture of the upper thallus ranges from smooth to foveolate (covered with puts and depressions).