Placidium Californicum

	Placidium Californicum ''Placidium'' is a genus of crustose to squamulose to almost foliose lichens. The genus is in the family Verrucariaceae. Most members grow on soil (are terricolous), but some grow on rock (saxicolous). The fruiting bodies are perithecia, flask-like structures immersed in the lichen body (thallus) with only the top opening visible, dotting the thallus. Lichen spot tests are all negative. Members of the genus lack rhizines, but otherwise resemble members of the genus '' Clavascidium''. Members of the genus are commonly called stiplescale lichens or earthscale.Field Guide to California Lichens, Stephen Sharnoff, Yale University Press, 2014, Taxonomy The genus was circumscribed in 1855 by Italian lichenologist Abramo Bartolommeo Massalongo. María Prieto and Ibai Olariaga suggest that ''Placidium'' is a superfluous illegitimate name according to strict application of nomenclatural rules. This is because when Massalongo circumscribed the genus in 1855, he included the original ty ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In binomial nomenclature, the genus name forms the first part of the binomial species name for each species within the genus. :E.g. ''Panthera leo'' (lion) and ''Panthera onca'' (jaguar) are two species within the genus ''Panthera''. ''Panthera'' is a genus within the family Felidae. The composition of a genus is determined by taxonomy (biology), taxonomists. The standards for genus classification are not strictly codified, so different authorities often produce different classifications for genera. There are some general practices used, however, including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: # monophyly – all descendants of an ancestral taxon are grouped together (i.e. Phylogeneti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Type Species In International_Code_of_Zoological_Nomenclature, zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the species that contains the biological Type (biology), type wiktionary:en:specimen, specimen (or specimens). Article 67.1 A similar concept is used for suprageneric groups and called a type genus. In botanical nomenclature, these terms have no formal standing under the International Code of Nomenclature for algae, fungi, and plants, code of nomenclature, but are sometimes borrowed from zoological nomenclature. In botany, the type of a genus name is a specimen (or, rarely, an illustration) which is also the type of a species name. The species name with that type can also be referred to as the type of the genus name. Names of genus and family ranks, the various subdivisions of those ranks, and some higher-rank names based on genus names, have suc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Verrucariales Verrucariales is an order (biology), order of Ascomycota, ascomycetous fungi within the subclass Chaetothyriomycetidae of the class Eurotiomycetes. Although most of the Verrucariales are lichenised, the family Sarcopyreniaceae consists of 11 species of lichenicolous fungi, lichenicolous (lichen-dwelling) fungi. Phylogenomics, Phylogenomic analysis suggests that the divergent evolution, divergence between the lichenised Verrucariales and nonlichenised Chaetothyriales occurred about 131 million years ago. Description Members of the Verrucariales are primarily organisms that form symbiotic relationships with algae or cyanobacteria, creating lichens. These lichens are remarkable for their ability to thrive in a wide range of environments, from extremely dry land habitats to freshwater and even marine ecosystems, where they are particularly abundant. A significant portion of Verrucariales species can be found saxicolous lichen, growing on rocks, especially in temperate climates. Some ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Placidium Yoshimurae ''Placidium'' is a genus of crustose to squamulose to almost foliose lichens. The genus is in the family Verrucariaceae. Most members grow on soil (are terricolous), but some grow on rock (saxicolous). The fruiting bodies are perithecia, flask-like structures immersed in the lichen body (thallus) with only the top opening visible, dotting the thallus. Lichen spot tests are all negative. Members of the genus lack rhizines, but otherwise resemble members of the genus '' Clavascidium''. Members of the genus are commonly called stiplescale lichens or earthscale.Field Guide to California Lichens, Stephen Sharnoff, Yale University Press, 2014, Taxonomy The genus was circumscribed in 1855 by Italian lichenologist Abramo Bartolommeo Massalongo. María Prieto and Ibai Olariaga suggest that ''Placidium'' is a superfluous illegitimate name according to strict application of nomenclatural rules. This is because when Massalongo circumscribed the genus in 1855, he included the original ty ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]