Fungi named in 1938

Coprinellus disseminatus, formerly known as Coprinus disseminatus and commonly known as the fairy inkcap, fairy bonnet, or trooping crumble cap, is a species of agaric fungus in the family Psathyrellaceae. It can be found around dead wood in Europe and North America.

Panaeolus semiovatus var. semiovatus, also known as P. semiovatus and Anellaria separata, and commonly known as the ringed panaeolus, is a medium-sized buff-colored mushroom with black spores that grows on dung.

Baeospora myosura, commonly known as conifercone cap, is a species of fungus that produces agaricoid fruit bodies. The cap is convex before flattening, 2 centimetres (3⁄4 in) wide, and coloured pale brown to cream. The lamellae are adnexed, pale, and very close. The spore print is white to cream and amyloid. The mushroom grows on decaying conifer cones and is common in North America and Europe. It is nonpoisonous but of unknown edibility.

Hemimycena is a genus of fungi in the family Mycenaceae. The genus has a widespread distribution, and according to a 2008 estimate, contains about 50 species. The genus was described by mycologist Rolf Singer in 1938. They lack amyloid reaction in the spores.

Baeospora is a genus of fungi in the family Cyphellaceae. Basidiocarps (fruit bodies) are agarics. The genus was circumscribed by mycologist Rolf Singer in 1938. The most recently described species, B. occidentalis, is a snowbank fungus that was discovered in montane coniferous forests of the western USA.

Sowerbyella is a genus of fungi in the family Pyronemataceae. The genus has a widespread distribution, and contains 17 species found mostly in Europe and China. The genus was circumscribed by John Axel Nannfeldt in Svensk Bot. Tidskr. vol.32 on page 118 in 1938. The genus name of Sowerbyella is in honour of James Sowerby (1757–1822), who was an English naturalist, illustrator and mineralogist.

The Zoopagaceae are a family of fungi in the Zoopagales order. The family contains 6 genera, and 78 species. The family was circumscribed in 1938.

Mycenella is a genus of fungi in the family Tricholomataceae. The widespread genus contains 10 species, found mostly in temperate regions. Mycologist Rolf Singer circumscribed the genus in 1938.

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Sowerbyella radiculata is a species of apothecial fungus belonging to the family Pyronemataceae. The typical form appears as yellowish cups up to 5 cm (2.0 in) in diameter usually on soil close to coniferous trees. A distinctive form, var. kewensis, is usually larger (up to 10 cm (3.9 in) across) and often associated with broad-leaved trees. This is an uncommon European species.

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Eutypella canker is a plant disease caused by the fungal pathogen Eutypella parasitica. This disease is capable of infecting many species of maple trees and produces a large, distinguishable canker on the main trunk of the tree. Infection and spread of the disease is accomplished with the release of ascospores from perithecia. Therefore, the best way to manage the Eutypella canker is to remove trees that have been infected. If infected, it can decrease the quality of wood cut for lumber and can thus have a negative economic impact.

Stemphylium sarciniforme is a plant pathogen infecting lentil, red clover and chickpea.

Pycnopeziza is a genus of fungi in the family Sclerotiniaceae.

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Lindtneria is a genus of fungi in the family Stephanosporaceae. As of March 2015, Index Fungorum accepts nine species in the genus. It is named after Serbian mycologist Vojteh Lindtner (1904–1965).

Lactarius adhaerens is a member of the large milk-cap genus Lactarius in the order Russulales. It is found in Madagascar, where it grows on decayed wood. The species was first described in 1938 by French botanist Roger Heim.

Guepiniopsis alpina, commonly known as the jelly cup, alpine jelly cone, or poor man's gumdrop, is a species of fungus in the family Dacrymycetaceae. The small, gelatinous fruit bodies are orange and cone- or cup-shaped, producing a yellowish spore print. Found in western North America and Iran, the fungus grows on decaying conifer wood. It is of little to no culinary interest.

Basidiodendron is a genus of fungi in the order Auriculariales. Basidiocarps (fruit bodies) are corticioid, thin, effused and are typically found on fallen wood. The genus is widespread in both temperate and tropical regions and contains over 30 species.

Agaricus subrutilescens, also known as the wine-colored agaricus, is a mushroom of the genus Agaricus.

Acervus is a genus of fungi in the family Pyronemataceae. They have cup-shaped fruitbodies that may be up to 1.5 cm (0.6 in) in diameter, with a bright yellow to orange-colored hymenium. Fruitbodies occur on soil, duff, and plant debris. Six of the seven species in the genus are found in China.

Taphrina polystichi is an ascomycete fungus that parasitizes Christmas fern (Polystichum acrostichoides) in eastern North America. It was described by A. J. Mix in 1938.

Pseudohiatula cyatheae is a species of fungus in the family Physalacriaceae, and the type species of the genus Pseudohiatula. The species was first described by mycologist Rolf Singer in 1938.

Omphalia tralucida is a species of fungus in the family Tricholomataceae. First described scientifically by Donald Everett Bliss in 1938, it causes decline disease in the date palm (Phoenix dactylifera).