Summary:
Also listed in Morels etc. category. Features include a chestnut to blackish brown fruitbody with a pale border, lying flat but undulating, the underside ocher to yellow with conspicuous rhizoids, growing on the ground in coniferous forests, especially on burned ground, and microscopic characters including spores with appendages at both ends.

Microscopic:
spores 30-45 x 8-15 microns, narrowly fusoidal, rough, colorless, with 2 to 4 droplets; asci 375-450 x 12.4-19.9 microns; paraphyses clavate, 5.4-7.9 microns wide at tip, colorless, with brown encrusted pigment, contents finely granular; setae 6.6-8.1 microns in lower part, widening gradually to 8.8-10.9 microns at tip, sometimes lobed, brown, thick-walled except tip thin-walled, aseptate, (Abbott), spores (28)30-40 x 7-10 microns not including appendages, fusiform-navicular [spindle-boat-shaped], "finely warty to rough, sometimes connected transversely to form ridges", with 2 drops and colorless pointed appendages on both ends, appendages 3-5 microns long, spores in part biseriate; asci 8-spored, 300-400 x 15-20 microns, inamyloid; paraphyses "cylindrical and with slight clavate thickenings to 5-8 microns, tips encrusted with amorphous brownish substance, with few septa"; setae "brownish, thick-walled, not septate, tips blunt, lighter, arising from deep within medulla and reaching to the surface of the hymenium", (Breitenbach)

Notes:
Rhizina undulata is found at least in BC, WA, OR, ID, also AB, MB, NB, NF, NT, ON, SK, AK, U.K., and the Netherlands, and is known from Asia, (Abbott). It occurs also in OR (Larsen), and MT (Seaver).

Synonyms and Alternate Names:
Morchella semilibera sensu aucts. mult. (misapplied name)