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Omphalina
Omphalina is a genus of small agarics with white, nonamyloid, basidiospores and decurrent lamellae[1][2][3]. Typically the pileus has a deep central depression giving the umbrella-like to funnel-shaped pileus the appearance of a belly button, or a belly with a navel. Similarly shaped agarics are said to be omphalinoid in appearance. Additional recommended knowledge
Historical nomenclatural confusionThe generic name Omphalina is an ancient one, linked to the even older mushroom name Omphalia which cannot be used because it is an illegitimate later homonym. Historically, the former was generally applied to any white-spored, similarly sized and shaped mushroom. As a result, many species that still are labelled Omphalina, or were labelled Omphalia are in fact not true Omphalinas. The now conserved type species is Omphalina pyxidata[1][2][3]. Prior to conservation of the type, typification was debated and unstable for several decades. Phylogenetic redefinitionMolecular phylogenetic studies using DNA show this species and others on mosses with reddish brown to yellowish brown pigments that encrust the hyphal walls are related, while many other former Omphalinas are distantly related and are classified in other orders, or families, and in other genera. BiologyOmphalina in the modern sense is a small genus of bryophyte colonizing mushrooms. They grow on mossy burned soils and in undisturbed mossy areas in Arctic, Antarctic, alpine and rural and urban sites. Many other bryophilous mushrooms occur in such habitats but they have other characteristics. Reclassified and excluded former OmphalinasLichenized omphalinas, which are basidiolichens, are now placed in Lichenomphalia. Examples are: Omphalina ericetorum also known as Omphalina umbellifera, now called Lichenomphalia umbellifera; etc. Bryophilous grey to blackish former omphalinas are in the genus Arrhenia. Examples are: Omphalina epichysium, now Arrhenia epichysium; Omphalina sphagnicola now Arrhenia sphagnicola; etc. Any former omphalina with amyloid spores goes into another genus. These genera include Mycena, Myxomphalia, Pseudoarmillariella, Xeromphalina, etc. No true Omphalina has gelatinized or slimy tissues or brightly colored pigments. Neither do they have cystidia. Excluded species whose exclusion is supported by molecular analysis, include the genera: Blasiphalia, Chrysomphalina, Chromosera, Contumyces, Gerronema, Haasiella, Loreleia, Rickenella, etc. Etymology of OmphalinaOmphalina is the diminutive of Omphalia which is a reference to the belly button or navel-like appearance of the small dome-shaped caps with a central depression. It derives from the Greek word omphalos. References
Categories: Fungi | Basidiomycota |
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Omphalina". A list of authors is available in Wikipedia. |