Rudolph Arnold Maas Geesteranus

The Auriscalpiaceae are a family of fungi in the order Russulales. Like much of the Russulales, it has been defined through molecular phylogeny, and includes physically dissimilar species, such as the tooth fungus Auriscalpium and the gilled, often shelf-like members of Lentinellus.

Mycena adscendens, commonly known as the frosty bonnet, is a species of fungus in the family Mycenaceae. The fungus produces small white fruit bodies (mushrooms) with caps up to 7.5 mm (0.3 in) in diameter that appear to be dusted with sugar-like granules. Caps are supported by thin, hollow stems up to 20 mm (0.8 in) long, which are set on a disc-like base. Its distribution includes Europe, Turkey and the Pacific coast of the United States. The fruit bodies grow on fallen twigs and other woody debris on the forest floor, including fallen hazel nuts. The variety carpophila is known from Japan.

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Sarcodon leucopus is a species of tooth fungus in the family Bankeraceae. It is found in Asia and Europe, where it grows in association with pine trees. The fungus produces a pale brown fruiting body up to 20 cm across, with thin downward-pointing spines on its underside that start whitish and age to purplish-brown. It is considered near-threatened by the IUCN and endangered in Switzerland.

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Hydnellum auratile is a tooth fungus in the family Bankeraceae, first described by the German mycologist Max Britzelmayr in 1891. The fungus produces distinctive orange to orange-brown fruit bodies with caps up to 5 cm wide that fade to brown with age. It forms ectomycorrhizal associations with both coniferous and deciduous trees, particularly Scots pine and Norway spruce on calcareous soils. Though widely distributed across Europe, parts of Asia, Australia, and North America's Pacific Northwest, H. auratile is considered endangered in Switzerland.

Cynema is a genus of fungi in the family Tricholomataceae. This is a monotypic genus, containing the single species Cynema alutacea, found in Papua New Guinea.

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Auriscalpium dissectum is a species of fungus in the family Auriscalpiaceae of the Russulales order. Found in Zaire, it was described as new to science in the year 1979.

Nothomitra is a genus of fungi in the earth tongue family Geoglossaceae. There is no known common name. Nothomitra is morphologically distinguished from Microglossum in that the fertile hymenium in Nothomitra is not flattened as in Microglossum. Furthermore, the hymenium in Nothomitra is distinctly free at the junction of the stipe, unlike in Microglossum in which the hymenium is flattened and gradually intergrades with the stipe.

Mycorrhaphium is a genus of fungi in the family Steccherinaceae. The genus was circumscribed by Dutch mycologist Rudolph Arnold Maas Geesteranus in 1962. The type species is Mycorrhaphium adustum (formerly referred to Hydnum). Fruit bodies of species in the genus have caps, stipes, and a hydnoid (tooth-like) hymenophore. There is a dimitic hyphal system, where the skeletal hyphae are found only in the tissue of the "teeth", and a lack of cystidia. The spores are smooth, hyaline (translucent), and inamyloid. Walter Jülich created the family Mycorrhaphiaceae to contain the type genus

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Auriscalpium umbella is a species of fungus in the family Auriscalpiaceae of the Russulales order. Described by the Dutch mycologist Rudolph Arnold Maas Geesteranus in 1971, it is known from New Zealand.

Auriscalpium barbatum is a species of spine fungus in the family Auriscalpiaceae of the Russulales order. Found in Western Australia in 1977 embedded on fragments of humus in sandy soil, it was described as new to science by the Dutch mycologist Rudolph Arnold Maas Geesteranus in 1978.

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Sarcodon wrightii is a species of tooth fungus in the family Bankeraceae. It was first described in 1860 by Miles Berkeley and Moses Ashley Curtis as Hydnum wrightii. They were sent a specimen collected from Japan as part of the North Pacific Exploring and Surveying Expedition (1853–56). Rudolph Arnold Maas Geesteranus transferred it to the genus Sarcodon in 1967. The fungus produces roughly spherical spores that are tuberculate (covered in warts) and measure 5.5–6.5 by 4.5–5.5 μm.

Sarcodon thwaitesii is a species of tooth fungus in the family Bankeraceae. It is found in Asia, Europe, and New Zealand, where it fruits on the ground in mixed forest.

Sarcodon rutilus is a species of tooth fungus in the family Bankeraceae. Found in Papua New Guinea, it was described as new to science in 1974 by Dutch mycologist Rudolph Arnold Maas Geesteranus. The specific epithet rutilus refers to the red cap.

Hydnellum lepidum is a species of tooth fungus in the family Bankeraceae. Found in Europe, it produces pinkish‑brown to purplish‑brown fruiting bodies with scaly caps up to 10 cm across and downward‑pointing spines underneath. The fungus forms mycorrhizal associations with deciduous trees, particularly oak.

Sarcodon quietus is a species of tooth fungus in the family Bankeraceae. Found in the Congo, it was described as new to science in 1967 by Dutch mycologist Rudolph Arnold Maas Geesteranus.

Sarcodon procerus is a species of tooth fungus in the family Bankeraceae. Found in the Democratic Republic of the Congo, it was described as new to science in 1967 by Dutch mycologist Rudolph Arnold Maas Geesteranus. Its spores measure 6.7–8 by 4.5–5.4 μm.

Sarcodon praestans is a species of tooth fungus in the family Bankeraceae. Found in Papua New Guinea, it was described as new to science in 1974 by Dutch mycologist Rudolph Arnold Maas Geesteranus.

Sarcodon ianthinus is a species of tooth fungus in the family Bankeraceae. Found in Papua New Guinea, it was described as new to science in 1974 by Dutch mycologist Rudolph Arnold Maas Geesteranus.

Sarcodon humilis is a species of tooth fungus in the family Bankeraceae. Found in Malaysia, it was described as new to science in 1971 by Dutch mycologist Rudolph Arnold Maas Geesteranus.

Sarcodon conchyliatus is a species of tooth fungus in the family Bankeraceae. Found in Malaysia, it was described as new to science in 1971 by Dutch mycologist Rudolph Arnold Maas Geesteranus. The fruit bodies have finely tomentose caps that are dull ochraceous, greyish or brownish, and typically have drab to purplish tinges. The spines on the cap underside are not decurrent on the stipe. Maas Geesteranus placed the fungus in the section Virescentes, along with S. atroviridis and S. thwaitesii, all species with flesh that dries to a deep olive green color.

Sarcodon caliginosus is a species of tooth fungus in the family Bankeraceae. Found in Papua New Guinea, it was described as new to science in 1974 by Dutch mycologist Rudolph Arnold Maas Geesteranus. Its fruit bodies have dark grey-brown caps with reddish tinges and brownish-pink coloration at the margins.

Sarcodon aglaosoma is a species of tooth fungus in the family Bankeraceae. Found in Papua New Guinea, it was described as new to science in 1976 by Dutch mycologist Rudolph Arnold Maas Geesteranus. It is quite similar to H. joeides and S. ianthinus, both also from New Guinea.

Phellodon rufipes is a species of tooth fungus in the family Bankeraceae. It was described as new to science in 1971 by Dutch mycologist Rudolph Arnold Maas Geesteranus, from collections made in Japan.

Phellodon plicatus is a species of tooth fungus in the family Bankeraceae. Found in Australia, it was first described in 1925 by Curtis Gates Lloyd as a species of Hydnum. Dutch mycologist Rudolph Arnold Maas Geesteranus transferred it to the genus Phellodon in 1966.