Secotioid fungi produce an intermediate fruiting body form that is between the mushroom-like hymenomycetes and the closed bag-shaped gasteromycetes, where an evolutionary process of gasteromycetation has started but not run to completion. Secotioid fungi may or may not have opening caps, but in any case they often lack the vertical geotropic orientation of the hymenophore needed to allow the spores to be dispersed by wind, and the basidiospores are not forcibly discharged or otherwise prevented from being dispersed —note—some mycologists do not consider a species to be secotioid unless it has lost ballistospory.
Lepiota is a genus of gilled mushrooms in the family Agaricaceae. All Lepiota species are ground-dwelling saprotrophs with a preference for rich, calcareous soils. Basidiocarps are agaricoid with whitish spores, typically with scaly caps and a ring on the stipe. Around 400 species of Lepiota are currently recognized worldwide. Many species are poisonous, some lethally so.
The Agaricaceae are a family of basidiomycete fungi and include the genus Agaricus, as well as basidiomycetes previously classified in the families Tulostomataceae, Lepiotaceae, and Lycoperdaceae.
Calvatia is a genus of puffball mushrooms that includes the giant puffball C. gigantea. It was formerly classified within the now-obsolete order Lycoperdales, which, following a restructuring of fungal taxonomy brought about by molecular phylogeny, has been split; the puffballs, Calvatia spp. are now placed in the family Lycoperdaceae of the order Agaricales.
Weraroa was a genus of mushrooms from the families Hymenogastraceae and Strophariaceae. The genus was initially described by mycologist Rolf Singer in 1958 to accommodate the single species Secotium novae-zelandiae reported by Gordon Herriott Cunningham in 1924. It was thought that the genus represented an intermediary evolutionary stage between a hypogeous (underground) ancestor and the related epigeous genus Stropharia. Advances in phylogenetics and taxonomic changes since 1958 found it contained unrelated species from multiple genera. It is now considered a synonym of the genus Psilocybe.
Agaricus abruptibulbus is a species of mushroom in the genus Agaricus. It is commonly known as the abruptly-bulbous agaricus or the flat-bulb mushroom. First described by the mycologist Charles Horton Peck, this bulbous-stemmed edible species smells slightly of anise or bitter almond, and turns yellow when bruised or cut. The mushroom is medium-sized, with a white, yellow-staining cap on a slender stipe that has a wide, flat bulb on the base.
Podaxis is a genus of secotioid fungi in the family Agaricaceae. Species, which have the appearance of a "stalked-puffball", have a worldwide distribution, and tend to be found growing solitary or scattered on sandy soils, especially in arid regions. Although close to 50 species have been described, it has been argued that many of them may represent extremes in the natural range of variations found in Podaxis pistillaris.
Agaricus lilaceps, also known as the cypress agaricus or the giant cypress agaricus is a species of mushroom. It is among the largest and most choice edible Agaricus species in California. Aside from size, Agaricus lilaceps is characterized by a robust stature, as the stipe often club-shaped.
Macrolepiota albuminosa is a species of agaric fungus in the family Agaricaceae, found in Peradeniya, Ceylon.
Agaricus columellatus is a species of secotioid fungus in the family Agaricaceae. The species was described by William Henry Long in 1941. The type collection was made in Arizona, where it was found growing singly on the ground in a grassy area in Mesquite-Catclaw flats. Originally described as the sole member of the monotypic genus Araneosa, in 2016 molecular genetic studies revealed its affinity to the genus Agaricus.
Endoptychum is a genus of secotioid fungi in the family Agaricaceae. Like the majority of secotioid taxa, the individual species of Endoptychum are thought to be recent mutations from agaricoid species, hence, Endoptychum is likely not a valid monophyletic genus.
Disciseda is a genus of gasteroid fungi in the family Agaricaceae. It is a widely distributed genus that is prevalent in arid zones. Disciseda was circumscribed by mycologist Vassiliĭ Matveievitch Czernajew in 1845.
Gymnogaster is a genus of fungi in the family Boletaceae. It is a monotypic genus, containing the single secotioid species Gymnogaster boletoides, found in Australia. The fungus produces bright yellow fruit bodies with a light brown internal gleba, and the fruit bodies turn blue then dark brown after bruising or handling.
Agaricus deserticola, commonly known as the gasteroid agaricus, is a species of fungus in the family Agaricaceae. Found only in southwestern and western North America, A. deserticola is adapted for growth in dry or semi-arid habitats. The fruit bodies are secotioid, meaning the spores are not forcibly discharged, and the cap does not fully expand. Unlike other Agaricus species, A. deserticola does not develop true gills, but rather a convoluted and networked system of spore-producing tissue called a gleba. When the partial veil breaks or pulls away from the stem or the cap splits radially, the blackish-brown gleba is exposed, which allows the spores to be dispersed.
Tubaria is a genus of fungi in the family Tubariaceae. The genus is widely distributed, especially in temperate regions. Tubaria was originally named as a subgenus of Agaricus by Worthington George Smith in 1870. Claude Casimir Gillet promoted it to generic status in 1876. The mushrooms produced by species in this genus are small- to medium-sized with caps ranging in color from pale pinkish-brown to reddish-brown, and often with remnants of the partial veil adhering to the margin. Mushrooms fruit on rotting wood, or, less frequently, in the soil. There are no species in the genus that are recommended for consumption.
Montagnea arenaria, commonly known as the gasteroid coprinus, is a species of secotioid fungus in the family Agaricaceae. Originally named Agaricus arenarius by Augustin Pyramus de Candolle in 1815, it was transferred to the genus Montagnea by Sanford Myron Zeller in 1943. The species is characterized by a cap that has an apical disc, radial gills, a hymenophore, and spores with a prominent germ pore. It is inedible.
Agaricus inapertus, commonly known as the mountain gasteroid agaricus, is a species of secotioid fungus in the genus Agaricus. It was first described by American mycologists Rolf Singer and Alexander H. Smith in 1958 as Endoptychum depressum. Molecular analysis later proved it to be aligned with Agaricus, and it was formally transferred in a 2003 publication.
Leucoagaricus rubrotinctus, commonly known as the red-eyed parasol, is a widespread species of fungus in the family Agaricaceae. It was described as new to science in 1884 by American mycologist Charles Horton Peck as Agaricus rubrotinctus. Rolf Singer transferred it to the genus Leucoagaricus in 1948. The fungus may be a complex of several closely related species. It is inedible.
Agaricus aestivalis is a species of mushroom-forming fungus in the genus Agaricus. They are found in Germany and are edible.
