Summary:
Section Deminutivae (Smith), Section Saetulipes (Maas Geesteranus). Features include 1) small size, 2) a striate, pink to lilaceous pink cap that becomes browner, 3) distant pinkish-white to light vinaceous gills that have concolorous or white edges, 4) a stem that is cap-colored at the base and paler in the upper part, 5) growth on monocots, and 6) microscopic characters including elongate spores.

Cap:
0.2-0.7cm across, small, hemispheric to convex, becoming flat or centrally depressed when old, margin incurved becoming uplifted; pink to lilaceous pink, darker at center, becoming paler, finally "ochraceous-incarnate to light reddish brown or fulvous"; pruinose to finely puberulous [downy], becoming bald, margin translucent-striate and sulcate [grooved], (Maas Geesteranus), 0.2-0.7cm wide, convex to hemispheric with a flattened, depressed, or subumbonate center, occasionally becoming flat with age, margin initially slightly incurved; "whitish to pale vinaceous or livid vinaceous when unexpanded, tending to be paler when expanded except on the disc", occasionally developing more brownish tints when old; "moist but also frosted somewhat if not weathered", "usually radially furrowed and translucent", margin often slightly scalloped, (Redhead)

Flesh:
very thin; colored as cap, (Maas Geesteranus)

Gills:
broadly adnate to decurrent with a tooth, arcuate, distant (6-12 reaching stem); pinkish-white to light reddish brown with edges colored as faces or whitish, (Maas Geesteranus), "ascending or broadly adnate with a small decurrent tooth, or more prominently arcuate", "moderately sized and spaced, varying to subdistant", with none, or 1, rarely 2, series of subgills; whitish to pale vinaceous, (Redhead)

Stem:
0.3-1.5cm x 0.02-0.07cm, equal, sometimes somewhat widened at base, straight or curved, "narrowly fistulose, cartilaginous, tenacious"; pale pink or yellowish pink becoming light reddish brown; dry, smooth, pruinose becoming bald for the greater part, attached to the substrate "by a whorl or comparatively few to numerous, radiating, whitish mycelial hyphae or fibrils which tend to gelatinize" and melt into the substrate, (Maas Geesteranus), 0.7-2.3cm x 0.02-0.12cm, equal or widening slightly downward, rarely narrowing downwards, fistulose, cartilaginous, sometimes compressed but mostly round in cross-section; cap-colored at base and paler above; frosted; "somewhat erumpent to slightly swollen and pubescent or strigose at the point of attachment, or with a small disc of radiating basal hyphae", (Redhead)

Odor:
not distinctive (Maas Geesteranus, Redhead)

Taste:
not distinctive (Maas Geesteranus, Redhead)

Microscopic spores:
spores 10.7-15.6 x 3.0-4.9 microns, elongated pip-shaped, smooth, amyloid; basidia 4-spored, 24-32 x 7-10 microns, narrowly clavate, clamped, with sterigmata 7-9 microns long; pleurocystidia absent, cheilocystidia 13-30 x 5-11 microns, forming a sterile band (gill edge homogeneous), "embedded in gelatinous matter and hard to discern, clavate to obpyriform, clamped, covered with comparatively few to fairly numerous, more or less evenly spaced, simple, cylindrical excrescences" 1.8-3.5 x 0.9-1.8 microns, (Maas Geesteranus), 10-12.2 x 4-5 microns, elongate elliptic to almond-shaped, smooth, amyloid, thin-walled, colorless, with a prominent apiculus; basidia 4-spored, 24-26 x 8.5-9 microns, clavate, clamped; pleurocystidia none, cheilocystidia abundant, 13-23 x 5.5-9.5 microns, capitate-pedicellate to clavate, inamyloid, "thin-walled, with knobs at the apex, embedded in a gelatinous matrix and forming a sterile edge, subtended by gelatinous hyphae", (Redhead)

Spore deposit:
white (Redhead)

Notes:
Mycena tubarioides has been found at least in BC and the Netherlands (Redhead). There is a collection from WA labeled as this species.

EDIBILITY

Synonyms and Alternate Names:
Omphalia tubarioides Maire