Observation 161986: Exidia nigricans (With.) P. Roberts
When: 2014-01-25
(46.3617° 13.6979° 700m)

Notes: Code: Bot_782/2014_DSC9821

Habitat: modestly southeast inclined mountain slope, mixed forest, Fagus sylvatica and Picea abies dominant; overgrown scree, rocks and boulders, calcareous ground, relatively warm and dry place, partly protected from direct rain by tree canopies, average precipitations ~ 3.000 mm/year, average temperature 7-9 deg C, elevation 700 m (2.300 feet), alpine phytogeographical region.

Substratum: fallen Fagus sylvatica branch in its initial disintegration stage.

Place: Lower Trenta valley, on the trail from ‘Na melu’ place to ‘Na skalah’ settlement, at the foot of Mt. Srebnjak, East Julian Alps, Posočje, Slovenia EC.

Comments: Growing in groups of many confluent fruit bodies; clump’s dimensions up to about 8 × 5.5 × 2.5 cm.

Nikon D700/Nikkor Micro 105mm/f2.8 and Canon G11, 6.1-30mm/f2.8-4.5

Proposed Names

61% (2)
Eye3 Eyes3
Recognized by sight: Black, large, confluent, with many warts, but microsopy is required.
Used references: (1) P. Roberts, Exidia nigricans: a new and legitimate name for Exidia plana. Mycotaxon. 109: 219-220 (2009) cited in MycoBank.
(2) G.J. Krieglsteiner (Hrsg.), Die Grosspilze Baden-Württembergs, Band 1, Ulmer (2000), p 98.
(3) S. Buczacki, Collins Fungi Guide, Collins (2012), p 584.
(4) J. Breitenbach, F. Kraenzlin, Eds., Fungi of Switzerland, Vol. 2.Verlag Mykologia (1984), p 62.
(5) http://www.grzyby.pl/gatunki/Exidia_plana.htm (Wigg.) Donk, syn.: E. nigricans (With) P. Rob (1966.
(6) http://forum.pilze-bayern.de/...
Based on microscopic features: Spores smooth. Dimensions: 12,7 [14,2 ; 14,8] 16,3 × 3,6 [4,1 ; 4,3] 4,8 microns, Q = 2,8 [3,4 ; 3,6] 4,2; N = 40; C = 95%, Me = 14,5 × 4,2 microns; Qe = 3,5. Basidia dimensions: 15.7 [18 ; 19.7] 22.1 × 6.1 [9.8 ; 12.3] 16 microns, Q = 1.2 [1.6 ; 1.9] 2.3; N = 15; C = 95%, Me = 18.9 × 11.1 microns; Qe = 1.8. Olympus CH20. NEA 40x/0.65, magnification 400x, in water, congo red. AmScope MA500 digital camera.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
given your explanation
By: Danny Newman (myxomop)
2014-10-08 13:38:55 CDT (-0400)

and the relative non-importance of demonstrating “true” spore color in a posted micrograph (amyloidity, inamyloidity and dextrinoidity being just as well noted in writing as shown in an image), I take no issue whatsoever with this interesting artifact. if anything, I think it adds pizzazz and intrigue to your already excellent observations.

colors are false
By: amadej trnkoczy (amadej)
2014-10-06 05:48:46 CDT (-0400)

Hi Danny,
Thanks for your prize. Unfortunately these colors are false. I have a microscope with poor lighting (tungsten bulb), which strongly changes its color temperature with light intensity. In addition the stability of main power voltage at the place where I live is also very poor. This results in constant unpredictable changing of the color of microscope light. Because I copy/paste spores from several shots into a single published picture, individual contributions have all kind of color. That causes this ‘colorfulness’. Sometimes (when not too lazy) I compensate color temperature of individual contributions to the final picture in PhotoShop, but even then I don’t know, which color is ‘correct’. Would probably be better to convert my microscope pictures to grayscale pictures.

By: Danny Newman (myxomop)
2014-10-04 12:04:50 CDT (-0400)

How is it your spores look like an assortment of jelly beans?? I’ve never seen such an array of colors before in a spore mount.

As always, thank you for your absolutely impeccable contributions.

Created: 2014-03-23 07:34:21 CDT (-0400)
Last modified: 2015-02-23 21:34:27 CST (-0500)
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