Observation 196848: Clavulina rugosa (Bull.) J. Schröt.

Code: Bot_837/2014_DSC4173

Habitat: mixed wood, Fagus sylvatica and Picea abies dominant trees; SE oriented, moderately inclined mountain slope; shallow, skeletal soil layer, overgrown sandy calcareous ground with stones and rocks; relatively warm place; in shade; partly protected from direct rain by tree canopies; average precipitations ~ 3.000 mm/year, average temperature 7-8 deg C, elevation 658 m (2.150 feet), alpine phytogeographical region.

Substratum: forest soil, rotten leaves, among stones and mosses.

Place: Lower Trenta valley, right bank of river Soča, between villages Soča and Trenta, west of the upper part of ‘Na Melu’ meadow, East Julian Alps, Posočje, Slovenia EC.

Comments: Habitus of fruit bodies found clearly fit to Clavulina rugosa. Initially, I was almost sure in this determination – until I looked at spores. Their shape and a single large oil drop in each fit perfectly to Clavulina rugosa (Ref.:2). However, spores compared to all sources I’ve checked are markedly too small (see Figs. M2a and M2b) and actually dimensionally correspond much better to Clavulina cinerea (which spores contain several smaller drops (Ref.2)). I have no explanation for this discrepancy and also lack knowledge to judge how important it is. Still, habitus of the fungi found seems to me hard to interpret as Clavulina cinerea. Of cause, this may not be the only option?

Growing scattered solitary and in small groups of a few individual fruit bodies; more than 15 fruit bodies on an area of 2 × 2 m; fruit bodies up to 5 cm tall and 2.5 cm wide; branches around 1.5-2 mm in diameter; flesh brittle; SP white with slight yellow tint, oac5.

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

Proposed Names

28% (1)
Eye3 Eyes3
Recognized by sight: White, few branches, fragile flesh.
Used references: (1) G.J. Krieglsteiner (Hrsg.), Die Grosspilze Baden-Württembergs, Band 2., Ulmer (2000), p 56.
(2) J.Breitenbach, F.Kraenzlin, Eds., Fungi of Switzerland, Vol.2. Verlag Mykologia (1984), p 354.
(3) S. Buczacki, Collins Fungi Guide, Collins (2012), p 456.
(4) R. Phillips, Mushrooms, Macmillan (2006), p 345.
(5) M. Bon, Parey’s Buch der Pilze, Kosmos (2005), p 308.
(6) D. Arora, Mushrooms Demystified, Ten Speed Press, Berkeley (1986), p 642.
Based on microscopic features: Spores smooth. Dimensions: 7.7 [8.4 ; 8.7] 9.4 × 6.7 [7.2 ; 7.4] 8 microns; Q = 1.1 [1.2] 1.3; N = 37; C = 95%; Me = 8.6 × 7.3 microns; Qe = 1.2. Olympus CH20, NEA 100x/1.25, magnification 1.000 x, oil, in water, live material. AmScope MA500 digital camera.
Based on chemical features: Taste and smell indistinctive.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2015-01-22 08:13:43 PST (-0800)
Last modified: 2015-01-22 08:16:09 PST (-0800)
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