This is the largest group of fungi, comprising around 20 families.

Agaricaceae - Mushrooms
Agaricus arvensis (Horse Mushroom)

Agaricaceae - Parasols, Powdercaps, Dapperlings, etc.
Cystoderma amianthinum (Earthy Powdercap)	Coprinus comatus (Shaggy Inkcap)	Coprinus comatus (Shaggy Inkcap)

Amanitaceae
Amanita muscaria (Fly Agaric)	Amanita muscaria (Fly Agaric)
Amanita rubescens (Blusher)	Amanita rubescens (Blusher)	Amanita vaginata (Grisette)
Amanita excelsa var. spissa (Grey Spotted Amanita)	Amanita excelsa var. spissa (Grey Spotted Amanita)

Bolbitiaceae - Fieldcaps & Conecaps

Cantharellaceae

Cantharellus cibarius (Chanterelle)

Cortinariaceae - Webcaps
Cortinarius collinitus	Cortinarius stillatitius (Purple Stocking Webcap)	Cortinarius hemitrichus (Frosty Webcap)
		Cortinarius triumphans (Birch Webcap)

Crepidotaceae - Oysterlings & Twiglets

Entolomataceae - Pinkgills

Gomphidiaceae - Spikes

Hydnangiaceae

Laccaria amethystina (Amethyst Deceiver)

Hygrophoraceae - Waxcaps & Woodwaxes
		Hygrocybe pratensis (Meadow Waxcap)
Hygrocybe coccinea (Scarlet Waxcap)	Hygrocybe coccinea (Scarlet Waxcap)	Hygrocybe autoconica (Persistent Waxcap)
Hygrocybe miniata (Vermilion Waxcap)	Hygrocybe laeta (Heath Waxcap)
Hygrocybe conica (Blackening Waxcap)	Hygrocybe conica (Blackening Waxcap)	Hygrocybe conica (Blackening Waxcap)

Hygrophoropsidaceae
Hygrophoropsis aurantiaca (False Chanterelle)	Hygrophoropsis aurantiaca (False Chanterelle)

Lentinaceae - Oysters & Oysterlings

Paxillaceae - Rollrims

Pluteaceae - Shields

Psathyrellaceae - Brittlestems & Inkcaps

Russulaceae - Brittlegills
Russula emetica (Sickener)	Russula ochroleuca (Ochre Brittlegill)	Russula puellaris (Yellowing Brittlegill)	Russula anthracina (Coal Brittlegill)
Russula claroflava (Yellow Swamp Brittlegill)	Russula sardonia (Primrose Brittlegill)	Russula atrorubens

Russulaceae - Milkcaps
Lactarius pubescens (Bearded Milkcap)	Lactarius pubescens (Bearded Milkcap)	Lactarius torminosus (Woolly Milkcap)
Lactarius rufus (Rufus Milkcap)	Lactarius rufus (Rufus Milkcap)	Lactarius deterrimus (False Saffron Milkcap)

Strophariaceae - Mottlegills
Panaeolus semiovatus (Egghead Mottlegill)	Panaeolus semiovatus (Egghead Mottlegill)	Panaeolus semiovatus (Egghead Mottlegill)
Panaeolus acuminatus (Dewdrop Mottlegill)	Panaeolus acuminatus (Dewdrop Mottlegill)

Strophariaceae - Tufts
Hypholoma fasciculare (Sulphur Tuft)
Hypholoma capnoides (Conifer Tuft)	Kuehneromyces mutabilis (Sheathed Woodtuft)

Strophariaceae - Scalycaps

Pholiota squarrosa (Shaggy Scalycap)

Tricholomataceae
Tricholomopsis rutilans (Plums and Custard)	Lepista nuda (Wood Blewit)

Tricholomataceae
Marasmius rotula (Collared Parachute)	Marasmius androsaceus (Horsehair Parachute)

Tricholomataceae
Oudemansiella mucida (Porcelain Fungus)	Armillaria ostoyae (Dark Honey Fungus)	Mycena galopus (Milking Bonnet)

Tricholomataceae
Pleurocybella porrigens (Angel's Wings)	Pleurocybella porrigens (Angel's Wings)

Useful links:

Scottish Fungi Fungus Conservation Trust MushroomExpert.com MycoKey fungus.org.uk