A to Z of British Fungi

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Common Name	Scientific Name	Description
Oak Bracket	Inonotus dryadeus	A large annual bracket fungus that has corky flesh that is found usually solitary in broadleaf woodland and is parasitic on Oak trees.
Oak Curtain Crust	Hymenochaete rubiginosa	Small, chestnut bracket forming densley crowded, overlapping tiers; often wavy or lobed at the margin
Oak Mazegill	Daedalea quercina	Usually found growing solitary, this large imposing bracket fungus may occasionally occur in tiers, particularly on the cut ends of felled oak trunks. It is seldom...
Oak Mildew	Microsphaera alphitoides
Oak Milkcap	Lactarius quietus	A medium sized agaric found in broadleaf woodland on soil, especially with Oak.
Oak Polypore	Piptoporus quercinus	This rare but widespread fungus causes a brown rot of the heartwood of mature or dead oak trees.
Ochre Brittlegill	Russula ochroleuca	A medium-sized Russula that has an ochre-yellow cap found growing in small scattered troops or solitary on soil with both coniferous and broadleaf trees.
Oilslick Brittlegill	Russula ionochlora	A medium sized Russula that has a variable cap colour, pale cream gills and a white stem, found growing solitary or in small troops on soil with broadleaf trees, usually Beech.
Oily Waxcap	Hygrocybe quieta	This fungus, which is orange-yellow in colour, has flesh that is dryer than most waxcaps and occurs mainly in grassland but may also be found in woodland glades.
Old Man of the Woods	Strobilomyces strobilaceus	A rare, medium to large Bolete, found either solitary or in small groups in both coniferous and deciduous woodland.
Olive Oysterling	Panellus serotinus	A kidney-shaped fungus with a short rudimentary or lateral stem found growing on the fallen trunks and branches of broadleaf trees, favouring Birch and Beech.
Omphalina hepatica	Omphalina hepatica
Omphalina pyxidata	Omphalina pyxidata	A small fungus with a funnel-shaped cap, found growing in troops on soil among grass and moss, usually on sandy soils, less commonly calcareous.
Omphalina rickenii	Omphalina rickenii	A small, pale-grey fungus that has a funnel shaped cap found soil amongst moss, sometimes near walls and on woodland embankments.
Omphalina sphagnicola	Omphalina sphagnicola
Orange Birch Bolete	Leccinum versipelle	A large, often massive bolete with a distinctive orange cap found growing solitary or in small groups on soil, specifically with Birch.
Orange Bonnet	Mycena acicula	A very small fungus with an orange cap found growing solitary or in small tufts on buried wood and other plant debris.
Orange Grisette	Amanita crocea	This lovely fungus is distinguished by a thick, white volva, faint zig-zag white-and-orange stem markings, and an absence of veil remnants on the cap. Amanita crocea, is edible.
Orange Milkcap	Lactarius aurantiacus	A small inedible fungus found solitary or in small groups on soil with coniferous or broadleaf woodland
Orange Mosscap	Rickenella Fibula	A very small fungus with a delicate grooved orange cap found growing in small troops or solitary in damp moss or grass.
Orange Oak Bolete	Leccinum quercinum	A medium to large bolete with a brown cap growing either solitary or in small scattered groups on soil with Oak.
Orange Peel Fungus	Aleuria aurantia	An unmistakable orange cup or irregular disc which as the common name suggests looks like discarded orange peel.
Orange-scaled Parasol	Lepiota magnispora	Smallish to medium sized agaric that has a yellowish cap covered with reddish0brown scales, found growing, usually solitary on damp soil in woodland.
Orbilia inflatula	Orbilia inflatula
Oxyporus populinus	Oxyporus populinus
Oyster Mushroom	Pleurotus ostreatus	Usually found growing in large clumps, on dead or dying hardwood trees, very rarely on conifers, with a variably coloured cap. An edible species that is cultivated around the world.
Oyster Rollrim	Tapinella panuoides	A mediumsized fungus that has a pale buff cap found growing solitary or caespitose on conifer debris.