Fungi named in 1805

Amanita porphyria, also known as the grey veiled amanita or the porphyry amanita, is a fairly common, inedible mushroom of the genus Amanita found in Europe and North America.

Rhizocarpon geographicum (the map lichen) is a species of lichen, which grows on rocks in mountainous areas of low air pollution. Each lichen is a flat patch bordered by a black line of fungal hyphae. These patches grow adjacent to each other, leading to the appearance of a map or a patchwork field. When circular, or roughly circular, the diameter of this lichen species has been widely used to help determining the relative age of deposits, e.g. moraine systems, thus revealing evidence of glacial advances. The process is termed lichenometry.

Morchella semilibera, commonly called the half-free morel, is a species of fungus in the family Morchellaceae. It is native to Eurasia and is edible.

Erysiphe is a genus of plant pathogenic fungi in the family Erysiphaceae. The species in this genus are known for causing powdery mildew.

Pisolithus is a genus of fungi within the family Sclerodermataceae (suborder Sclerodermatineae).

Peziza varia, commonly known as the spreading brown cup fungus, Palomino cup or recurved cup, is a species of fungus in the genus Peziza, family Pezizaceae.

Gymnosporangium is a genus of heteroecious plant-pathogenic fungi which alternately infect members of the family Cupressaceae, primarily species in the genus Juniperus (junipers), and members of the family Rosaceae in the subfamily Amygdaloideae (apples, pears, quinces, shadbush, hawthorns, rowans and their relatives). The common name cedar-apple rusts has been used for these fungi. According to the Dictionary of the Fungi (10th edition, 2008), there were 57 species in the genus. In 2023, Species Fungorum lists up to 74 species. In junipers (the primary hosts, see photo), some species form a

Pertusaria is a large genus of warty crustose lichens in the Pertusariaceae family. The fruiting bodies are usually modified apothecia that immersed in warts on the main body (thallus) with small holes for the spores to emerge, similar to ostioles, or are fully above and lecanorine (spore bearing discs surrounded by a ring of tissue similar to the tissue of the thallus. Members of the genus are commonly called wart lichens. The widespread genus contains over 500 species. Classification in the large genus relies heavily on thallus chemistry to distinguish and classify species, some of which

Rhizocarpon is a genus of crustose, saxicolous (or sometimes lichenicolous), lecideoid lichens in the family Rhizocarpaceae. The genus is common in arctic-alpine environments, but also occurs throughout temperate, subtropical, and even tropical regions. They are commonly known as map lichens because of the prothallus forming border-like bands between colonies in some species, like the common map lichen (Rhizocarpon geographicum).

Puccinia asparagi is the causative agent of asparagus rust. It is an autoecious fungus, meaning that all stages of its life cycle – pycniospores, aeciospores, and teliospores – all develop upon the same host plant . Rust diseases are among the most destructive plant diseases, known to cause famine following destruction of grains, vegetables, and legumes. Asparagus rust occurs wherever the plant is grown and attacks asparagus plants during and after the cutting season. Asparagus spears are usually harvested before extensive rust symptoms appear. Symptoms are first noticeable on the growing

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Gymnosporangium clavariiforme (tongues of fire) is a species of rust fungus which alternately infects Juniperus and hawthorns. In junipers, the primary hosts, G. clavariiforme produces a set of orange tentacle-like spore tubes called telial horns. These horns expand and have a jelly like consistency when wet. The spores are released and travel on the wind until they infect a hawthorn tree. On the secondary hosts, the fungus produces yellowish depressions on the leaves. It also infects the fruit, which grows whitish tubes like a Medusa head. These are the spore tubes. The spores must then

Roccella tinctoria is a lichenised species of fungus in the genus Roccella, homotypic synonym of Lecanora tinctoria (DC.) Czerwiak., 1849. It was first described by Augustin Pyramus de Candolle in 1805. It has the following varieties: R. t. var. portentosa R. t. var. subpodicellata R. t. var. tinctoria and formae: R. t. f. complanata R. t. f. tinctoria

Roccella is a genus of 23 species of lichens in the family Roccellaceae. The genus was circumscribed by Swiss botanist Augustin Pyramus de Candolle in 1805, with Roccella fuciformis as the type species.

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Erysiphe pisi is a plant pathogen that causes powdery mildew on several plant species.

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Microporus is a genus of fungi in the family Polyporaceae. The genus has a widespread distribution and, according to a 2008 estimate, contains 11 species. The genus name combines the Ancient Greek words μικρός ("small") and πόρος ("pore").

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Erysiphe convolvuli is a species of powdery mildew in the family Erysiphaceae. It is found across the world, where it affects bindweeds (Calystegia and Convolvulus) and has been reported from morning-glory plants (Ipomoea).

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Umbilicaria leiocarpa, commonly known as textured rock tripe, is a species of saxicolous (rock-dwelling), umbilicate lichen in the family Umbilicariaceae. First described by Augustin Pyramus de Candolle in 1805, it is characterised by its small to medium-sized grey thallus with a cracked upper surface and smooth reproductive structures. The species has a primarily Holarctic distribution, being found across Europe from Fennoscandia to the Pyrenees, with populations occurring from sea level to alpine elevations around 2,000 m (6,600 ft). It shows a particular preference for siliceous rock

Collema nigrescens is a leafy (foliose) jelly lichen (Collema genus) found growing on the bark of trees such as bigleaf maples, in wetter coastal parts of California. It is commonly called button jelly lichen or bat's wing lichen. It is blackish-green when wet, and dark brownish-green to dark olive when dry. The photosynthetic partner is the Nostoc cyanobacterium that is spread throughout the thallus (main body part). Although foliose in form, like all jelly lichens, the thallus is not differentiated, lacking layers or an upper or lower cortex (lichen) and the cyanobacteria is spread

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