Observation 129111: Dacrymyces stillatus Nees

When: 2011-03-18

Collection location: Bovec basin, East Julian Alps, Posočje, Slovenia [Click for map]

46.3387° 13.5409° 510m

Who: amadej trnkoczy (amadej)

No specimen available

Code: Bot_496/2011_DSC6651

Habitat: : South oriented mountain slope, mixed forest, dominant Fagus sylvatica, Acer sp., Picea abies and other hardwood trees, calcareous ground, mostly in shade, partly protected from direct rain by tree canopies, average precipitations ~ 3.000 mm/year, average temperature 8-10 deg C, elevation 510 m (1.670 feet), alpine phytogeographical region.

Substratum: dead quite disintegrated debarked large trunk of Picea abies.

Place: Bovec basin, south of the road from Bovec to village Plužna, near Ušje place, East Julian Alps, Posočje, Slovenia EC

Comments: characteristic forked basidia abundant.

Spores smooth, septated. Dimensions: 14.9 (SD = 0.8) x 5.5 (SD = 0.3) μ, Q = 2.7 (SD = 0.19), n = 28. Motic B2-211A, magnification 1.000 x, oil, in water.

(1) S.Buczacki, Collins Fungi Guide, Collins (2012), p 596. 14-17/5-6
(2) http://www.rogersmushrooms.com/... 12-15/5-6
(3) http://www.mykoweb.com/CAF/species/Dacrymyces_stillatus.html 14-16 × 4.5-6 µ
(4) M.Bon, Parey’s Buch der Pilze, Kosmos (2005), p 324. 10-15/3-5

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

Proposed Names

57% (1)
Recognized by sight
Used references: (1) S.Buczacki, Collins Fungi Guide, Collins (2012), p 596.
(2) http://www.rogersmushrooms.com/...
(3) http://www.mykoweb.com/CAF/species/Dacrymyces_stillatus.html
(4) M.Bon, Parey’s Buch der Pilze, Kosmos (2005), p 324.
Based on microscopic features: Spores smooth, septated. Dimensions: 14.9 (SD = 0.8) x 5.5 (SD = 0.3) μ, Q = 2.7 (SD = 0.19), n = 28. Motic B2-211A, magnification 1.000 x, oil, in water.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
not in the check list?
By: amadej trnkoczy (amadej)
2013-02-21 13:04:51 PST (-0800)

Gerhard and Danny thank you for your input. Relatively high certainty, which I assigned to this determination was based on the fact that Slovenian fungi checklist (A. Poler, ed., Seznam Gliv Slovenije (1998)) knows only two Dacrimices species: D. stillatus and D. chrysospermus. Spore length (measured length 14.9 μ) clearly separates both species – D. sillatus, 14-17 μ (Breitenbach, Collins) and D. chrysospermus, 17-25 μ (E-flora BC, Mycoquebeck.org). I reexamined all 41 spore pictures I made. The result regarding septation (average = 2.62 septa (SD = 0.9 septa), n=41) speaks in favor of D. stillatus. I also reexamined other pictures of basidia with some hypha I made, but they are inconclusive regarding clamps. Judging about thin or thick spore walls is above the level of my knowledge. I always have problems with this because the ‘thickness’ of walls depend on how I focus the scope. May be my equipment or experience is not good enough to answer this questions. It is also easily possible that the Slovenian fungi checklist is incomplete and I found something what is not yet on the list. Nevertheless, next time I find Dacrimices sp. (it is common here around) I know what to look after. Thanks again.

By: Gerhard Koller (Gerhard)
2013-02-21 11:03:28 PST (-0800)

that’s the problem and I do not really believe in stillatus.
D. stillatus should have thickwalled spores and hyphae without clamps. There is a lookalike which is as common as stillatus but has thinwalled spores (see my obs.) which is called Dacrymyces minor. And this observation does indeed like a bit like that (not that confluent as stillatus). Amadej should check if the hyphae have clamps or not. D. minor has none. Spore wall breadth should be more than 0,20 µ for being thickwalled.

i see
By: Danny Newman (myxomop)
2013-02-21 09:55:11 PST (-0800)

3 septations in most spores, others have less, none have more. walls seem thin. presence or absence of clamps not discernible from the given photos.

By: Gerhard Koller (Gerhard)
2013-02-21 02:57:24 PST (-0800)

just for the record:
in Dacrymyces identification it is very important to look if
a) spores are thin- or thickwalled
b) if hyphae or clamped or not

The micro pics are brilliant but I cannot see from them the two above-mentioned features.

In addition, the number of septations in spores is also important, e.g. 1-3 or 3-7 per spore.

Created: 2013-02-21 01:25:39 PST (-0800)
Last modified: 2013-02-21 13:07:30 PST (-0800)
Viewed: 82 times, last viewed: 2018-03-14 15:10:18 PDT (-0700)
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