Observation 128098: Bisporella citrina (Batsch) Korf & S.E. Carp.
When: 2012-10-06
(46.4277° 13.6155° 1470m)

Notes: Code: Bot_665/2012_DSC5432

Habitat: In mixed alpine forest, dominant Fagus sylvatica with some Picea abies and Abies alba; east oriented mountain slope, calcareous bedrock however apparently acid soil (Vaccinium myrtillus); mostly in shade, partly protected from direct rain by tree canopies, average precipitations ~ 3.000 mm/year, average temperature 2-4 deg C, elevation 1.470 m (4.800 feet), alpine phytogeographical region.

Substratum: fallen, debarked trunk probably Fagus sylvatica.

Place: Mt. Mangart region, northeast ridge of Mt.Planja, 1.553 m, East Julian Alps, Posočje, Slovenia EC

Comment: Pileus diameter less than 2 mm; SP whitish-yellow, faint.

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

Proposed Names

92% (2)
Eye3 Eyes3
Recognized by sight
Used references: (1) M.Bon, Parey’s Buch der Pilze, Kosmos (2005), p 332.
(2) R.Phillips, Mushrooms, Macmillan (2006), p 371.
(3) R.Lueder, Grundkurs Pilzbestimmung, Quelle & Meyer (2008), p 144.
(4) http://www.mycoquebec.org/...
Based on microscopic features: Spores smooth. Dimensions: 10.4 (SD = 1.1) x 4.3 (SD = 0.4) μ, Q = 2.39 (SD = 0.14), n = 18. Olympus CH20, NEA 100x/1.25, magnification 1.000 x, oil, in water. AmScope MA500 digital camera.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Hi Damon,
By: amadej trnkoczy (amadej)
2013-02-09 13:22:46 PST (-0800)

I’m certainly not particularly knowledgeable in mycology. It’s just my retirement hobby (in parallel to botany). I believe I’ve not seen B. sulphurina yet or at least I haven’t recognized it as such. From what I read in literature B. sulphurina is smaller (< 2mm and < 1mm diameter according to two references) than B. citrina (1 – 4 mm). It is also always associated with stromatic Pyrenomycetes and grown more clustered. Spores are narrower (2 – 2.5 micr, Mycoweb.com) than with B. citrina (3 -5 micr).

B. citrina is very common where I live. I’ve seen it many times. I can say that it also can grow in clusters and can be of quite different color. So, clustering and color could hardly be a good distinguishing trait between both species. When I observed this large log with thousands of fruitbodies I noticed that cups were regularly smaller than what I usually see (< 2mm). In the field I modestly hoped that this could eventually be B. sulphurina. Also, a kind of blackish layer was covering some parts of moist log, which could eventually be a Pyromicete (not knowledgeable enough to be sure). Nevertheless, spores clearly proved that this is just another B.citrina (to my small disappointment).

By: damon brunette (damonbrunette)
2013-02-09 10:17:58 PST (-0800)

Since you are particularly knowledgeable, may i pick your brain for a moment. I have the Fungi of Sweden compendium, and long ago noticed Bisporella sulfurina in it. I RARELY see this as an option for the B. citrina look alike…. could you help me at understand when I may run into that particular species?. The clustering of B sulfurnina is supposed to make it distinctive…

Created: 2013-02-08 11:35:20 PST (-0800)
Last modified: 2013-12-03 17:43:04 PST (-0800)
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