Covers mushrooms and other non-lichenized fungi that form multicellular fruiting bodies large enough to be seen with the unaided eye.

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Scientific names beginning with M:
Macrocystidia cucumiscucumber cap, cucumber-scented mushroom
Distribution: Usually found in nutrient-rich soils among herbaceous plants in gardens and parks rather than in forests (although it can occur there, usually along trailsides).
Marasmiellus candiduswhite Marasmius
Marasmiellus peronatus
Distribution: Northern hemisphere.
Habitat: Forests and woodlands.
Substrate: Leaf litter and woody debris on ground.
Marasmius androsaceushorsehair fungus, horsehair parachute
Marasmius epiphyllusleaf parachute, white pinwheel
Marasmius oreadesfairy ring champignon, fairy ring mushroom
Distribution: The most common species in the PNW, M. oreades, occurs in many parts of the world in lawns, parks, pastures, and other grassy areas, where it often grows in arcs or circles known as fairy rings.
Marasmius plicatulusvelvet-cap Marasmius, pleated mushroom
Melanogaster euryspermusblack veined false truffle
Melanoleuca cognataspring cavalier, peach-gilled Melanoleuca
Spores: large spores (7.5--10 x 4.5--6.5 µm)
Melanoleuca melaleucacommon cavalier, changeable Melanoleuca, dark Melanoleuca
Melanophyllum haematospermumred-gilled Agaricus, redspored dapperling
Habitat: Found in a variety of habitats including forests, green houses, and manure piles
Melanotus horizontaliswood oysterling
Melastiza chaterifalse eyelash cup, red saucer
Mensularia radiataalder bracket
Meruliopsis coriumnetted crust
Habitat: Downed branches of hardwood or brush piles
Microglossum olivaceumolive earth-tongue
Mitrula elegansswamp beacon, matchstick fungus
Habitat: Occurs on very wet plant litter or even on litter submerged in cold, shallow, running water.
Montagnea arenariagastroid Coprinus
Morchella brunneanatural black morel
Morchella elatablack morel
Origin: Native
Morchella importunanorthwest landscape morel
Morchella populiphilawestern half-free morel
Morchella snyderiSnyder's morel
Mutinus caninusdog stinkhorn, dog's stinkhorn
Mycena aciculaorange bonnet, coral spring mycena
Mycena adscendensfrosty bonnet
Mycena alnicolaalder Mycena
Mycena amictacoldfoot bonnet
Spores: ellipsoid spores (6--10 x 3.5--5.5 µm)
Mycena aurantiomarginatagolden edge bonnet
Distribution: Conifer forest along the Pacific Coast Known to be from Europe as well
Spores: ellipsoid, 7--9 x 4--5 µm, smooth and amyloid, and the cheilocystidia are club-shaped with numerous short projections, somewhat like a mace
Mycena capillaripespinkedge bonnet
Mycena cinerellamealy bonnet
Mycena citrinomarginatayellow-edged Mycena
Distribution: Wide variety of habitats, including under trees in forests and parks, among fallen leaves, in the midst of mosses, on rotting tree bark, and in city-dwellers’ lawns.
Spores: 8--12 x 4--5.5 µm
Mycena clavicularis
Habitat: Conifer needles
Spores: spores are medium-sized (7--10 x 3--5.5 µm)
Mycena epipterygia
Distribution: Occurs widely in northern North America, Europe, and Asia, and numerous varieties
Substrate: In the PNW, M. epipterygia occurs in small to somewhat larger groups in needle litter, or on twigs or wood.
Spores: 8--11 x 5--6 µm and the cheilocystidia are club-shaped with short projections
var. epipterygia – yellowleg bonnet, yellow-stemmed Mycena
var. griseoviridis – yellow-stemmed Mycena
var. lignicola – yellow-stemmed Mycena
Mycena filopesiodine bonnet
Mycena galericulatacommon bonnet, common Mycena, toque Mycena
Mycena galopusmilking bonnet, milky Mycena
Mycena haematopusburgundydrop bonnet, bleeding Mycena
Substrate: The fruitbodies grow in groups, often in loose clusters, on both hardwood and conifer logs and can get quite large (for a mycena).
Spores: spores are broadly ellipsoid, 7--12 x 4--7 µm
Mycena latifoliasideshoot bonnet
Mycena leptocephalanitrous bonnet
Mycena maculatareddish-spotted Mycena
Distribution: M. maculata grows in groups or clusters on wood of both hardwoods and conifers in North America and Europe, mostly on conifers in the PNW.
Spores: spores are ellipsoid, 7--10 x 4--6 µm, and, although not conspicuous, the cheilocystidia are of varied shape and often bear projections
Mycena megasporarooting bonnet
Mycena oregonensis
Distribution: Also occurs in Europe.
Substrate: conifer litter under Douglas-fir and other conifers
Mycena overholtsiilarge mycena
Distribution: M. overholtsii apparently is restricted to the mountains of western North America. M. overholtsii appears in the mountains in late spring to early summer on wet rotting stumps and logs recently exposed by, or still partially covered with, melting snow.
Spores: spores measure 5--8 x 3.5--4 µm, and the sometimes hard-to-see cheilocystidia are smooth, slender, and cylindrical or sometimes a bit club-shaped
Mycena pelianthinablackedge bonnet
Mycena pictacryptic bonnet
Mycena puralilac bonnet, lilac Mycena
Mycena purpureofuscapurple edge bonnet
Mycena rosellapink bonnet
Mycena sanguinolentableeding bonnet, terrestrial bleeding Mycena
Mycena strobilinoidesflame Mycena, red-orange Mycena
Distribution: It occurs less commonly elsewhere in northern North America and also in Europe. M. strobilinoides seems to be most common at mid-elevations in the mountains, often in association with pines.
Mycena stylobatesbulbous bonnet
Mycena subcananeutral gray Mycena
Mycena vitilissnapping bonnet
Mycena vulgariscommon Mycena
Myxomphalia mauraburn site Mycena
Substrate: M. maura occurs on charred earth or burned wood under conifers or in fire pits, appearing from early summer late into fall.
Spores: white, smooth to roughened, and amyloid