Code: Bot_926/2015_DSC9744

Habitat: Alpine valley, semiruderal grassland in front of a farm house; shallow, calcareous ground; flat terrain; partly sunny; cold place in shade of mountain during winter months; exposed to direct rain, average precipitations ~ 3.000 mm/year, average temperature 7 – 9 deg C, elevation 560 m (1.850 feet), alpine phytogeographical region.

Substratum: stump of a cut down, old Juglans regia in its final disintegration stage.

Place: Lower Trenta valley, between villages Soča and Trenta, near farm house Skokar, Trenta 2, right bank of river Soča, East Julian Alps, Posočje, Slovenia EC

Comments: This is my second observation where I measured spores and the second time where they are definitely wider than they should be for M. mucida (see graph ‘Measured spore dimensions and data from literature’ in this observation and compare album Multiclavula mucida – I/ observation No.157303). Measured spores originated from tiny but clear spore pint produced by the sporocarps. All sources I found consistently state that spore width should not exceed 3.0 (3.2) μm. According to the key in Ref.:(4), only three other Multiclavula species (among 13 treated) fit to the spore dimensions of this observation: M. fossicola, which is terrestrial and has larger basidia (see MycoBank), M. coronilla, which is also terrestrial and M. clara, which is not white but pale orange. In addition MycoBank disagrees with Ref.4. in stating M. fossicola maximal spore width no more than 2.7(3.0) microns. Therefore the measured spore width remains a secret to me and casts some doubt in the determination. Sporocarps also seem quite frequently branched, more than stated in most sources for typical Multiclavula mucida. Substrate is also interesting. Most my other observations of this species in the Upper Soča River region involve Picea abies as substrate.

Nikon D700/Nikkor Micro 105mm/f2.8

Species Lists


Probably associated algae.

Proposed Names

57% (1)
Recognized by sight: Small, whitish, trooping clubs.
Used references: (1) J. Breitenbach, F. Kraenzlin, Eds., Fungi of Switzerland, Vol.2. Verlag Mykologia (1986), p 342.
(2) G.J. Krieglsteiner (Hrsg.), Die Grosspilze Baden-Württembergs, Band 2, Ulmer (2000), p 43.
(3) R.H. Petersen, Multiclavula mucida, Bull. New Zealand Dept. Sci. Industr.Res. 236 (1988), p 85, access available at .
(4) The key based on R.H. Petersen, Notes on Clavarioid Fungi. VII. Redefinition of the Clavaria vernalis – C. mucida, American Midland Naturalist (1967), 77.1, pp 205-221, modified by A. Rockefeller, J. Hollinger, D. Newman, available at Mushroom Observer.
(5) V. Wirth, Die Flechten Baden-Württembergs, Teil.1. 2., Ulmer (1995), p 594.
(6) D. Arora, Mushrooms Demystified, Ten Speed Press, Berkeley (1986), p 636.
(7) W. Rothmaler, Exkursionsflora von Deutschland, Vol.1, Niedere Pflanzen, Elsevier, 3. Auflage (1994), p 542.
(8) M.P. Nelsen, Noteworthy collection, Michigan, Multiclavula vernalis, Multiclavula mucida, The Michigan Botanist, Vol.46. (2009), p 124.
(9) C.W. Smith, et all, The lichens of Great Britain and Ireland, The British Lichen Society (2009), p 613.
Based on microscopic features: Spores smooth; dimensions: 6.4 [7.4 ; 7.7] 8.7 × 2.8 [3.2 ; 3.3] 3.7 microns; Q = 2 [2.3 ; 2.4] 2.6; N = 44; C = 95%; Me = 7.6 × 3.2 microns; Qe = 2.3. Basidia multiguttulate, sterigmata 4, oblong with narrow, stalk like, base; dimensions: 15.9 [19 ; 21.2] 24.3 × 4.3 [5 ; 5.5] 6.3 microns; Q = 2.6 [3.5 ; 4.2] 5.1; N = 15; C = 95%; Me = 20.1 × 5.3 microns; Qe = 3.9 (25-30 × 7-8 µm according to Ref.: 3). Olympus CH20, NEA 100x/1.25, magnification 1.000 x, oil, in water, cotton blue. AmScope MA500 digital camera.

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