Ronald H. Petersen

Hymenopellis radicata, commonly known as the deep root mushroom, beech rooter, or the rooting shank, is a widespread agaric readily identified by its deeply rooted stalk (stipe).

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Multiclavula is a genus of basidiolichens in the family Hydnaceae. The widespread genus contains 14 species. The genus was circumscribed by the American mycologist Ron Petersen in 1967, with Multiclavula corynoides assigned as the type species.

Clavulinopsis laeticolor, commonly known as the golden fairy club or handsome club, is a clavarioid fungus in the family Clavariaceae. It forms slender, cylindrical, yellow fruit bodies that grow on the ground in woodland litter or in agriculturally unimproved grassland.

Ramaria flavescens is a species of coral fungus in the family Gomphaceae. It was first described as Clavaria flavescens by Jacob Christian Schäffer in 1762; American mycologist Ron Peterson transferred it to the genus Ramaria in 1974. The IUCN Red List labels this species as Critically Endangered in Denmark and as Data Deficient in the Czech Republic.

Multiclavula mucida is a globally distributed species of basidiolichen belonging to the family Hydnaceae. Since its initial classification by Christiaan Hendrik Persoon in 1797, the species has been described under various synonyms and associated with multiple genera. Persoon described its fruiting bodies as gregarious (i.e. growing in groups but separate at the base), varying from simple to branching structures, predominantly whitish in colour with yellow to brownish tips. He also noted its frequent appearance in autumn on decaying, moist wood, often covered with a greenish crust necessary

Macrotyphula is a genus of clavarioid fungi in the family Phyllotopsidaceae. Basidiocarps (fruit bodies) are simple, narrowly club-shaped to filiform, sometimes arising from a sclerotium. They typically grow on dead wood or leaf litter, often in swarms.

Rhizomarasmius is a genus of fungi in the family Physalacriaceae, containing about five species.

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Neonothopanus is a genus of three species of fungi in the agaric family Omphalotaceae. The genus was circumscribed in 1999. The type species N. nambi is found in Australia, South America, Central America, and Malaysia, while N. gardneri is found in South America. Both of these species are bioluminescent. N. hygrophanus, found in central Africa, was added to the genus in 2011.

Multiclavula vernalis or the orange club-mushroom lichen is a species of clavarioid fungus in the Clavulinaceae (club-mushroom lichen) family. It was originally named as a species of Clavaria in 1822 by Lewis David de Schweinitz. Ronald H. Petersen transferred it to Multiclavula in 1967.

Hymenopellis is a genus of fungi in the family Physalacriaceae. The genus was circumscribed by mycologist Ron Petersen in 2010. The type species is Hymenopellis radicata, originally described by British botanist Richard Relhan in 1780 as Agaricus radicatus.

Dendrocollybia is a fungal genus in the family Tricholomataceae of the order Agaricales. It is a monotypic genus, containing the single species Dendrocollybia racemosa, commonly known as the branched collybia or the branched shanklet. Dendrocollybia racemosa fruit bodies have small pale grayish-white or grayish-brown caps up to 1 cm (0.4 in) wide, and thin stems up to 6 cm (2.4 in) long. The species is characterized by its unusual stem, which is covered with short lateral branches. The branches often produce spherical slimeheads of translucent conidiophores on their swollen tips. The

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Pleurotus abieticola is an edible species of fungus in the family Pleurotaceae, described as new to science by mycologists R.H. Petersen & K.W. Hughes in 1997. It grows on rotten wood of Picea in subalpine forests dominated by it. It has been reported first in far‐eastern Russia (Sikhote-Alin Nature Reserve), and then northeastern China (Songjianghe and Baihe in Jilin) and northwestern Russia (north of Saint Petersburg). It can be cultivated. Phylogenetic research has shown that while it belongs to P. ostreatus clade, it forms its own intersterility group.

Neonothopanus nambi is a poisonous and bioluminescent mushroom in the family Omphalotaceae. The genetic and molecular mechanisms underlying this species' bioluminescence were published in 2019, the first to be elucidated for a fungus. In 2020, genes from this fungus were used to create bioluminescent tobacco plants. Italian-Argentinian naturalist Carlo Luigi Spegazzini described the species in 1883 as Agaricus nambí in the subgenus Pleurotus, from material collected in December 1879 near Guarapí, a locality in Yaguarón, Paraguarí Department, Paraguay. Pier Andrea Saccardo placed it in the

Mucronella pendula is a species of fungus in the family Clavariaceae. It was first described in 1901 by George Edward Massee as Myxomycidium pendulum and the holotype collection is from Tasmania. American mycologist Ron H. Petersen transferred it to Mucronella in 1980.

Flammulina populonica is an edible winter mushroom. It differs from closely related species Flammulina velutipes by being slightly larger in size and having a thicker stem. It grows on wood of quaking aspen and other poplars (members of the genus Populus). It is found mainly in northern Europe and North America. Culinarily, it is used in the same way as F. velutipes. It requires cooking and is often used in soups.

Collybiopsis confluens, commonly known as the clustered toughshank, is a type of mushroom from the Omphalotaceae family. The fruiting body appears from summer until autumn in deciduous and coniferous forests. Collybiopsis confluens is not an edible mushroom.

Cantharellus persicinus, the peach or pink chanterelle, is a fungus native to the Appalachian region of eastern North America. Like other popular edible chanterelles, it is a member of the genus Cantharellus. It is suspected of being mycorrhizal, found in association with oaks and eastern hemlock. DNA analysis has shown C. persicinus to be a genetically valid species.

Rhizomarasmius pyrrhocephalus is a taxon of fungus. It serves as the type species of its genus.

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Ramaria flavosaponaria is a species of coral fungus in the family Gomphaceae. It is found in the mountains of eastern North America from Georgia and Tennessee to Nova Scotia.

Lentinula raphanica is a species of edible agaric fungus in the family Omphalotaceae. Described as two species, Armillaria raphanica and Gymnopus alliaceus by William Alphonso Murrill in 1943, they have been moved to a single species of the genus Lentinula by Ron Petersen and J. L. Mata in 2001. The convex caps are up to 7.5 centimetres (3 in) wide, pale with yellowish blotches. The stem is up to 8 cm (3+1⁄4 in) long. The spore print is white. The fruitbodies are similar in external appearance to others members of the genus Lentinula (including the shiitake, L. edodes), being distinguished by

Gloeomucro is a genus of fungi in the Hydnaceae family. The widespread genus contains nine species.

Cruentomycena viscidocruenta, commonly known as the ruby bonnet, is a species of agaric fungus in the family Mycenaceae. It is found in moist forested areas of Australia and New Zealand, often in small groups on rotting wood. Care in identification needs to be made to distinguish the ruby bonnet from red forms of Hygrocybe mushrooms.

Cantharellus appalachiensis is a fungus native to eastern North America in the genus Cantharellus, which includes other popular edible chanterelles. The cap color varies from brown to yellow, often with a brown spot on the cap at maturity. C. appalachiensis is mycorrhizal and is found in hardwood forests. The scientific name C. appalachiensis is after the Appalachian Mountains.

Campanophyllum is a fungal genus in the family Cyphellaceae. The genus is monotypic, containing the single species Campanophyllum proboscideum, found in Costa Rica. The genus was circumscribed in 2003 to accommodate the species formerly known as Lentinus proboscoides.

Setigeroclavula is a genus of fungi in the family Cyphellaceae. A monotypic genus, it consists of the single clavarioid species Setigeroclavula ascendens, found on the dead rachis of mother spleenwort (Asplenium bulbiferum) in New Zealand. Both the genus and species were described in 1988 by American mycologist Ron Petersen. The small, club-shaped fruitbodies are densely studded with erect hairs. The hyphal system is monomitic; the spores are smooth and hyaline (translucent).

Rhizomarasmius undatus (syn. Marasmius undatus) is a small mushroom which grows on fern rhizomes.