Notes:
During one of our excursions with the ‘We Love Mushroom’ group, Carolien Reijndertsen, who lead the foray, found some remarkably pale Coprinellus sect. Micacei. Initially, in the field, I thought they could be the illusive Coprinellus pallidissimus, but microscopy revealed broadly ovoid to submitriform spores and lack of caulocystidia, meaning we have collected the second record of Coprinellus saccharinus for the Netherlands! I am very excited to have seen, identified and archived this taxon. Both Jan Knuiman and Thomas W. Kuyper have confirmed the identification.

Distribution in the Netherlands: https://www.verspreidingsatlas.nl/0027370

Description:

Pileus: 12-23 × 13-34 mm; ovoid, campanulate but broad, with indistinct, low, truncate umbo; sulcate, smooth centre; velum sparse, white, sometimes slightly tan; distinctly pale cream ochre with slightly darker centre throughout lifecycle; glistening in direct light.

Lamellae: Numerous, crowded, free or adnexed; even margin, though fimbriate at first, ramarkably glistening in direct light, most likely due to to the large and abundant pleurocystidia that are clearly visible with and without magnification; white at first, later grey brown, then dark brown, eventually black; deliquescent.

Stipe: 40-110 × 3-5 (7) mm; terete, flexuous, slightly thicker at the base; longitudinally striate 3/4 from apex towards base; more velutinose on lower 1/4, demarcated by pseudo-annular zone; white or paler than pileus.

Context: Firm in the stipe, very thin in the outer half of the pileus; sericeous on the cut; concolourous with exterior; hollow in stipe.

Taste/Smell: Mild taste; musky, mushroomy smell.

Microscopy:
- Spores: Generally broadly ovoid, broad upperhalf, often acute apex rendering the spore more submitriform, rarely mitriform; very finely granulose interior; reddish brown in H2O; germpore central (~1 µm), rounded; sometimes slightly flattened dorsally.
- Pleurocystidia large and inflated.
- No caulocystidia were found.
- Velum: large, spherical, hyaline cells.

Measurements: (1000x; H2O; oil-im.; 1 sd=1,02 µm, n=12)
- 10,20 × 5,61 µm
- 8,67 × 5,61 µm
- 10,71 × 7,14 µm
- 9,18 × 6,12 µm
- 10,20 × 6,12 µm
- 11,22 × 6,12 µm
- 10,20 × 6,12 µm
- 9,18 × 6,63 µm
- 10,20 × 6,12 µm
- 10,20 × 6,12 µm
- 9,18 × 7,14 µm
- 9,69 × 6,12 µm
av: (9,18) 9,90 (11,22) x (5,61) 6,25 (7,14) µm
Qav: (1,29) 1,60 (1,83)

Ecology: Growing fasciculate on loamy soil with quite some vegetation debris, at the base of Crataegus, with Fraxinus.

Images

collage.jpg
DSC_1125_20170605161921322.jpg

Proposed Names

83% (1)
Recognized by sight: In the field we knew it was something other than Coprinellus micaceus, beccause of the remarkably pale fruitbodies and the lack of hairs on the stipe.
Used references: – http://www.grzyby.pl/...
- http://www.vielepilze.de/coprinus/copkey/ecopkey.pdf
- http://kvmv.be/...
- Knudsen & Vesterholt. (2008). Funga Nordica
Based on microscopic features: See notes

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= Observer’s choice
= Current consensus

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Created: 2017-06-13 07:13:47 PDT (-0700)
Last modified: 2017-06-13 07:13:49 PDT (-0700)
Viewed: 99 times, last viewed: 2019-05-24 06:24:38 PDT (-0700)
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