Observation 105955: Lachnum Retz.

When: 2012-08-16

Collection location: La Agencia, Oaxaca, Mexico [Click for map]


Who: Alan Rockefeller (Alan Rockefeller)

Specimen available

Growing on a fern frond.

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Recognized by sight

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A rough guess
By: Britney Ramsey (Riverdweller)
2012-08-19 17:18:11 CDT (-0400)

based on a name MatchMaker software spit out. MM lists a decent macroscopic match to this as Lachnum pygmaeum. I don’t know if it’s an acceptable name for where you collected this. Here are the notes from MM software.

LATIN NAME Lachnum pygmaeum (Fr.) Bres. Fungi Polonici Ann. Mycol. 1903 p.120; Dasyscyphus pygmaeus (Fr.) Sacc. [as Dasyscypha]; Lachnella pygmaea (Fr.) W. Phillips
NOTES features include yellow to whitish or dull orange cup with white downy hairs on exterior and margin, disc that is yellow to orange, slender stem, and clustered growth just at or below ground level on plant debris and wood; not specifically noted for Pacific Northwest, but “found throughout northern US and southern Canada”, also Europe, (Seaver), one of the larger and commoner members of the genus, reported by Oluna Ceska near Nanaimo BC (determined by J. Ginns from British Cup Fungi and their Allies by Dennis)
UPPER SURFACE fruitbody 0.2-0.4cm across, 0.2-0.7cm high, at first funnel-shaped, then spreading and flat; spore-bearing upper surface pale yellow to deep yellow, often varying toward orange or apricot, retaining the color when dried or becoming more ochraceous; margin rather blunt, when dried becoming somewhat elevated above the spore-bearing surface, finely and obscurely puberulent [downy], (Seaver), cup-shaped becoming expanded to expose a yellow disc up to 0.4cm across, (Dennis), fruitbody 0.2-0.4cm wide, white to yellowish, drying yellow, (Hansen)
UNDERSIDE pale yellow to flesh-color, or dull orange, more or less whitish-puberulent, often appearing smooth when dried, (Seaver), clothed with fine downy hairs (Dennis)
STEM slender, flexuous [wavy], usually somewhat thickened just below the disc, (Seaver), usually long and slender (Dennis), 0.3-0.7cm long, (Hansen)
HABITAT “gregarious or cespitose, typically occurring in a few cespitose clusters of five to ten each, surrounded by a few growing singly”, “arising at ground level on partly buried plant debris of all sorts, especially on roots and rhizomes of grasses and other herbaceous plants” and on limbs of both hardwood and coniferous trees, (Seaver), clustered or gregarious “on dead wood or branches just covered by soil or on dead roots and grass rhizomes, often on Ulex”, in spring and fall, (Dennis), on buried dead branches, roots and rhizomes, (Hansen)
MICROSCOPIC spores 7-11 × 1.9-2.4 microns, “narrow, broadest just above the middle, slightly tapering toward a point, at the lower end, round, or only slightly pointed above, straight”, 1-celled, biseriate; asci 60-75 × 4.5-6 microns, cylindric; paraphyses protruding above the asci, 3-4.5 microns wide, more or less lance-pointed, septate; hairs 20-50 microns long, 4-6 microns wide, clavate, rough, hyaline-white, 1-2-septate, (Seaver), spores 7-12 × 1.5-2.5 microns, narrowly fusiform, non-septate, biseriate; asci 8-spored, up to 70 × 6 microns, cylindric-clavate; paraphyses much longer than asci, 5 microns wide, lanceolate; hairs up to 40 × 5 microns, (Dennis), spores 7-12 × 1.5-2.5 microns, cylindric to fusoid, aseptate; asci 60-75 × 4.5-6 microns; paraphyses exceeding the asci by 15-25 microns, 4-5 microns wide; hairs 20-45 × 3-4 microns, cylindric, thin-walled, colorless, without apical crystals, (Hansen)
NAME ORIGIN means ‘dwarf’
SOURCES Seaver(2) (as Lachnella pygmaea (Fr.) Phill.), Dennis(1) (as Dasyscyphus pygmaeus (Fr.) Sacc.), Hansen, L.(1)

Created: 2012-08-19 08:41:44 CDT (-0400)
Last modified: 2012-08-19 17:08:31 CDT (-0400)
Viewed: 53 times, last viewed: 2018-04-21 14:43:21 CDT (-0400)
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