Richard William George Dennis

Lachnellula willkommii is a species of fungus belonging to the family Lachnaceae. It is native to Eurasia and Northern America.

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Psathyrella pennata, commonly known as the carbon brittlestem, or bonfire brittlestem, is a species of mushroom in the family Psathyrellaceae. It usually fruits during the spring.

Cudoniella clavus is a species of fungus in the family Helotiaceae. It was first described in 1805 by Johannes Baptista von Albertini and Lewis David de Schweinitz as Peziza clavus. British mycologist R. W. G. Dennis transferred it to Cudoniella in 1964. Fruit bodies of the jelly-like fungus consist of a disc-like cap measuring 0.4–1.2 cm (1⁄8–1⁄2 in) with a thin stipe. They are usually cream in colour, sometimes with hints of ochre or violet. They grow on rotting twigs, stems, leaves, and cones that are submerged in water. Cudoniella clavus is a widespread and common species. It is inedible.

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Panaeolus antillarum is a species of mushroom in the family Bolbitiaceae.

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Neottiella rutilans is a species of apothecial fungus belonging to the family Pyronemataceae. This European species appears in autumn as bright yellowish-orange discs among Polytrichum and related mosses.

Cheilymenia fimicola is a species of apothecial fungus belonging to the family Pyronemataceae.

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Cookeina speciosa is a species of fungus in the family Sarcoscyphaceae.

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Grovesia is a genus of fungi in the family Helotiaceae. This is a monotypic genus, containing the single species Grovesia pulchella. The genus name of Grovesia is in honour of James Walton Groves (1906-1970), who was a Canadian mycologist. The genus was circumscribed by Richard William George Dennis in Kew Bull. vol.14 on page 444 in 1960.

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Pseudonaevia is a genus of fungi in the family Dermateaceae. This is a monotypic genus, containing the single species Pseudonaevia caricina.

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