Entoloma luridum

https://www.mushroomexpert.com/Entoloma_luridum.html

Ecology: Saprobic (possibly mycorrhizal?); growing alone or gregariously under conifers; late summer and fall; originally described from Tennessee (Hesler 1967); distributed in eastern North America from the Great Lakes region to the Appalachians and the Maritime Provinces. The illustrated and described collection is from Wisconsin.

Cap: 5-8 cm across; broadly conic to broadly bell-shaped; bald; moist or dry; the margin becoming broadly wrinkled; pale creamy yellow; hygrophanous.

Gills: Narrowly attached to the stem; close; short-gills frequent; fairly bright yellow, becoming brownish pink as spores mature.

Stem: 6-10 cm long; 1-2 cm thick; equal or slightly tapered to apex; dry; bald; whitish to yellowish; basal mycelium white.

Flesh: Thick; white; unchanging when sliced.

Odor: Not distinctive.

Spore Print: Brownish pink.

Microscopic Features: Spores 5-10 x 5-7 m; angular; predominately 7-sided; subglobose to ellipsoid overall, with a large apiculus; smooth; thin-walled; hyaline in KOH; inamyloid. Basidia 35-40 x 6-10 m; clavate; 4-sterigmate. Hymenial cystidia not found. Pileipellis an ixocutis; elements 4-8 m wide, smooth, hyaline in KOH; subcutis of inflated elements. Clamp connections present.

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Colus pusillus

https://www.mushroomexpert.com/Colus_pusillus.html

Note: The description below is based on the photos sent to me, and on the sources cited below. I have not studied any collections of Colus pusillus.

Ecology: Saprobic; growing alone or gregariously; in woods or in cultivated areas; year-round in tropical and subtropical areas; possibly limited to Oceania.

Fruiting Body: Initially a whitish "egg" up to 2 cm across, attached to white cords; rupturing, with the stinkhorn emerging as a cage-like structure, 5-8 cm high, composed of about 10 corrugated, scarlet arms that are roughly triangular in cross-section and that sometimes fuse into a stem-like and slightly paler base composed of vertical columns; the inner surfaces of the cage covered with foul-smelling, olive brown slime; the egg tissue creating a whitish volva.

Microscopic Features: Spores 4.5-6 x 1.5-2 m; cylindric; smooth; hyaline in KOH.

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Lactarius paradoxus

https://www.mushroomexpert.com/Lactarius_paradoxus.html

Ecology: Mycorrhizal with pines (especially loblolly pine and long-leaf pine); growing alone or gregariously, often in grassy areas near the host trees; summer and fall; originally described from Florida (Beardslee & Birmingham 1940); fairly widely distributed in eastern North America, but more common in the lower Appalachians and the southeastern states; also recorded from the Caribbean and the Gulf Coast of Mexico. The illustrated and described collections are from Arkansas, Georgia, Florida, and Texas.

Cap: 4-13 cm; broadly convex with a slightly tucked-under margin when young; becoming centrally depressed, with an uplifted margin, or shallowly vase-shaped; slimy when fresh; bald; dark blue to bluish, with a silvery sheen when young, becoming dirty grayish to purplish tan; often with faint to moderate concentric zones of color; with old age staining dirty green and eventually becoming sordid bluish green overall.

Gills: Broadly attached to the stem or just beginning to run down it; close; short-gills present; purplish pink when young, becoming dirty buff to orangish with maturity; staining and bruising dirty green.

Stem: 2-5 cm long; 1-1.5 cm thick; usually tapered to the base; bald; without potholes; dry; colored like the cap, but with purplish pink flushes—or purplish pink overall; staining dirty green with age; hollowing.

Flesh: Whitish to bluish, greenish, or purplish (or brownish in the mature, hollowing stem); firm; staining purplish red in places when sliced.

Milk: Very scant; dark purplish red; staining surfaces purplish red.

Odor and Taste: Not distinctive.

Spore Print: Pale yellowish.

Microscopic Features: Spores 7-10 x 5.5-6.5 m; ellipsoid; ornamentation consisting of amyloid warts and ridges extending 0.5-0.75 m high, forming partial reticula. Hymenial macrocystidia rare; to about 60 m long; mucronate; scarcely projecting. Pileipellis a thick ixocutis.

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Ascocoryne cylichnium

https://www.mushroomexpert.com/Ascocoryne_cylichnium.html

Ecology: Saprobic on the well-decayed, wet wood of hardwoods or conifers; usually growing gregariously or clustered; fall and winter; widely distributed in North America.

Fruiting Body: 5-22 mm across; disc-shaped to cup-shaped or goblet-shaped; gelatinous; upper surface purple and bald; undersurface similar to upper surface, or paler and finely fuzzy; with or without a poorly defined stem-like structure; odorless.

Microscopic Features: Spores 18-27 x 4-6 ; smooth; fusiform; multiguttulate; developing several septa with maturity; often with small, subglobose conidia forming, especially at the ends (conidia not coalescing into chains). Asci eight-spored; up to 220 x 15 ; extreme apices blue in Melzer's reagent. Paraphyses filiform, with subclavate to clavate or subcapitate apices 1-3 wide.

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Boletus pseudosensibilis

https://www.mushroomexpert.com/Boletus_pseudosensibilis.html

Ecology: Mycorrhizal with oaks, and possibly with other hardwoods; growing scattered, or gregariously; summer and fall; widely distributed in eastern North America. The illustrated and described collections are from Illinois.

Cap: 4-16 cm; convex, becoming broadly convex; dry; finely velvety when young but soon bald; red to reddish brown or pinkish brown (most commonly reddish brown), fading to pinkish tan; when young sometimes bruising grayish where rubbed; the margin at first tucked under.

Pore Surface: Bright yellow when young, maturing to dirty orangish olive; when very young not bruising, or bruising only faintly, but soon bruising promptly blue, then slowly brown; with 1-2 circular to angular pores per mm at maturity; tubes shallow, 4-8 mm deep (rarely to 10 mm deep, in very large caps).

Stem: 6-10 cm long; 1-2.5 cm thick; usually tapered at the base; dry; solid; bald; yellow overall, with reddish tinges developing in the bottom half; bruising light blue where handled (then, over time, slowly brownish); not reticulate; basal mycelium pale to dark yellow, or sometimes whitish.

Flesh: Yellow in the cap; deep yellow or sometimes reddish in the stem; staining blue on exposure--sometimes faintly and erratically (staining usually more pronounced on older specimens).

Odor and Taste: Not distinctive.

Chemical Reactions: Ammonia flashing purplish blue to blue-green, then resolving to negative, grayish, or orangish on cap surface; negative on flesh. KOH reddish to dull orange or negative on cap surface; orangish on flesh. Iron salts grayish on cap; grayish or negative on flesh.

Spore Print: Dull olive brown.

Microscopic Features: Spores 9-12.5 x 3.5-4.5 ; subfusoid; smooth; orangish brown to golden in KOH; brownish in Melzer's. Hymenial cystidia fusoid-ventricose; 20-35 x 5-10 ; hyaline or with orangish contents in KOH. Pileipellis a collapsing trichoderm of elements 5-12.5 (-15) wide, smooth, hyaline to ochraceous or golden in KOH; at first with primarily tubular terminal cells, but by maturity developing many subterminal and terminal cells that are septate at short intervals, with terminal cell tubular or obnapiform.

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Amanita flavorubescens

https://www.mushroomexpert.com/Amanita_flavorubescens.html

Ecology: Mycorrhizal with hardwoods (especially oaks), but sometimes reported under conifers; occasionally found in urban habitats when trees are near; growing alone, scattered, or gregariously; spring through fall; fairly widely distributed east of the Rocky Mountains, but also known from Arizona and central Mexico.

Cap: 4.5-14 cm; convex, becoming broadly convex or nearly flat; sticky at first or when wet; bright yellow to yellow-brown (often brighter yellow toward the margin, especially when young); sometimes bruising slowly reddish; adorned with conspicuous, woolly to felty, yellow warts; bald underneath the warts; the margin not lined, or only faintly lined at maturity.

Gills: Free from the stem or slightly attached to it; white; close or crowded; short-gills frequent.

Stem: 6-15 cm long; 0.5-1.5 cm thick; more or less equal above a slightly swollen base; bald, or somewhat shaggy below the ring; pale yellow to whitish, bruising and staining slowly reddish; the ring persistent, skirtlike, and whitish to yellowish (sometimes featuring yellow stains at the edges); base often adorned with yellow volval remnants that break up and become indistinct, leaving yellow remnants on the soil.

Flesh: White to yellowish throughout; staining slowly reddish, especially in the base of the stem.

Odor: Not distinctive.

Spore Print: White.

Microscopic Features: Spores 6-11 x 4.5-7 ; smooth; ellipsoid; amyloid. Basidia without clamps; 4-spored. Pileipellis an ixocutis of hyphae 2-6 wide. Lamellar trama bilateral; subhymenium ramose.

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Syzygites megalocarpus

https://www.mushroomexpert.com/Syzygites_megalocarpus.html

Ecology: Parasitic on diverse mushrooms; widely distributed in North America.

Fruiting Body: A fuzzy mold covering the victim's surfaces; yellow becoming bluish or gray.

Microscopic Features: Sporangiophores septate, dichotomously branched up to 6 times, with sporangia at the tips. Spores 5-35 ; round or irregular; surface roughened.

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Cortinarius anomalus

https://www.mushroomexpert.com/Cortinarius_anomalus.html

Ecology: Mycorrhizal with hardwoods or conifers; growing alone or gregariously; fall; apparently widely distributed in North America.

Cap: 2-6 cm; convex, becoming broadly convex, flat, or slightly bell-shaped; dry; silky when young, developing a sheen with age; color variable, but generally grayish lilac to lilac brown when young, becoming more brown from the center outward.

Gills: Attached to the stem; close; lilac gray at first, becoming rusty brown; covered by a whitish cortina when young.

Stem: 3-8 cm long; up to 2 cm thick; equal or slightly swollen at the base; dry; lilac near the apex, at least when young; when young covered with whitish to yellowish veil material that breaks up into bands or sometimes disappears with maturity; solid, becoming hollow.

Flesh: Whitish to lilac (especially in the stem).

Odor: Sweet and slightly unpleasant, or not distinctive.

Spore Print: Rusty brown.

Microscopic Features: Spores 7-9 x 6-7 ; subglobose to very broadly ellipsoid; moderately verrucose. Cheilo- and pleurocystidia absent. Pileipellis a cutis.

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Gymnopus luxurians

https://www.mushroomexpert.com/Gymnopus_luxurians.html

Ecology: Saprobic; growing gregariously or in tight clusters in woodchips, or on lawns (probably fruiting from dead, buried roots), and, rarely, fruiting directly from logs and stumps; summer and fall; widely distributed and relatively common east of the Great Plains; occasionally appearing in western North America. The illustrated and described collections are from Illinois and Pennsylvania.

Cap: 3-11 cm; convex with an incurved margin when young, becoming broadly convex, broadly bell-shaped, or flat; dry or tacky; bald; dark reddish brown when young, fading to pinkish tan; often somewhat streaked-looking; the margin sometimes becoming slightly lined in old age.

Gills: Narrowly attached to the stem, often by means of a notch; close; short-gills frequent; whitish when young, but soon darkening to pale pinkish tan.

Stem: 4-7 cm long; 0.4-1.5 cm thick; more or less equal above a slightly enlarged base; dry; tough; often twisted; somewhat longitudinally ridged; finely silky or finely dusted; whitish above, buff to brownish below; darkening with age; often with white basal mycelium and/or rhizomorphs attached to the base.

Flesh: Whitish to pale pinkish tan; unchanging when sliced.

Odor and Taste: Odor not distinctive, or slightly fragrant; taste not distinctive, or slightly bitter.

Chemical Reactions: KOH on cap surface gray to olive gray—or sometimes very pale gray to negative on older cap surfaces.

Spore Print: White to creamy white.

Microscopic Features: Spores: 7-11 x 3-4.5 m; long-amygdaliform; smooth; hyaline in KOH; inamyloid. Cheilocystidia usually present; 20-40 x 3-7 m; cylindric to clavate, irregular, lobed, or somewhat diverticulate; smooth; thin-walled; hyaline in KOH. Pleurocystidia not found. Pileipellis a cutis of cylindric elements 4-12.5 m wide, brownish-encrusted in KOH except in faded caps, clamped.

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Agrocybe dura

https://www.mushroomexpert.com/Agrocybe_dura.html

Ecology: Saprobic; growing alone, scattered, or gregariously in grass (lawns, meadows, fields); sometimes appearing in fairy rings; appearing from spring through fall, but most likely to be seen in May, at least in temperate climates; originally described from Great Britain (Bolton 1788); widely distributed in Europe and North America. The illustrated and described collections are from Illinois and Missouri.

Cap: 2.5-8 cm; convex at first, becoming broadly convex or nearly flat; tacky when fresh, but soon dry; bald; often becoming cracked or fissured in old age; usually whitish overall, or with a dull yellowish center—but sometimes creamy to dull yellowish overall; the margin often adorned with whitish to yellowish partial veil fibrils and remnants.

Gills: Narrowly attached to the stem; close or crowded; short-gills frequent; whitish at first, becoming dull grayish brown; edges faintly whitish at maturity; at first covered by a white partial veil.

Stem: 5-10 cm long and 3-15 mm thick; more or less equal; rigid; bald or a little fibrillose; whitish, sometimes discoloring brownish, especially in the bottom half; with a flimsy, ephemeral, whitish ring; basal mycelium white.

Flesh: White; unchanging when sliced.

Odor and Taste: Not distinctive.

Chemical Reactions: KOH on cap surface negative to yellowish.

Spore Print: Brown.

Microscopic Features: Spores 11-16 (-19) x 6-9 (-10) m; more or less ellipsoid, with one end flattened for a 2 -3 m pore; smooth; walls about 1 m thick; brownish orange to orangish-brownish in KOH; brown in Melzer's. Basidia 25-35 x 7-9 m; clavate; 4-sterigmate. Cheilocystidia 35-60 x 10-25 m; utriform to widely utriform; smooth; thin-walled; hyaline in KOH. Pleurocystidia 35-55 x 10-20 m; widely utriform to clavate or sphaeropedunculate; smooth; thin-walled; hyaline in KOH. Pileipellis hymeniform but quickly deteriorating and collapsing (best seen on very young caps); hymeniform elements 15-22 x 6-10 m; clavate to pyriform; hyaline in KOH.

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