Observation 187751: Melanoleuca polioleuca (Fr.) Kühner & Maire

Code: Bot_850/2014_DSC4876

Habitat: grassland mowed twice a year, semiruderal calcareous ground next to a small wooden building, on its southeast side, flat terrain, partly sunny, exposed to direct rain, average precipitations ~ 3.000 mm/year, average temperature 7-9 deg C, elevation 600 m (1.950 feet), alpine phytogeographical region.

Substratum: soil.

Place: Lower Trenta valley, right banks of river Soča, in front of Trenta 2b cottage, East Julian Alps, Posočje, Slovenia EC

Comments: Members of genus Melanoleuca are difficult to be determined to species level. Many pros agree this is almost impossible without microscopy. No wonder many old observations seem to be questionable particularly in Melanoleuca melaleuca group where in addition species names melaleuca, polioleuca and vulgaris have been treated differently by different authors. Krieglsteiner (2001) states that large part of all historical observations not supported with an available exsiccate should be simply forgotten. Nevertheless, following Ref.1.the mushrooms photographed seem to be Melanoleuca polioleuca. Two typical traits, large cheilocystidia (a few with a small head of crystals have been also observed) and brownish trama in stipe base should distinguish it from very similar M. melaleuca, which grows in exactly the same habitats.

Growing in a group of about 10 pilei within 2 × 0.5 m area; pilei diameter 6-9 cm, pilei surface looking velvety; pilei slightly hygrophanous, cutis peels off easily up to about 1/3 of the radius of pilei; stipe fibrous,4.5-8 cm long and 9-12 mm in diameter, at the base somewhat club shaped with a diameter of up to 18 mm; SP abundant, beige with slight green tint, oac7.

Nikon D700/Nikkor Micro 105mm/f2.8

Proposed Names

85% (1)
Eye3 Eyes3
Used references: (1) G.J. Krieglsteiner (Hrsg.), Die Grosspilze Baden-Württembergs, Band 3., Ulmer (2001), p 375.
(2) S. Buczacki, Collins Fungi Guide, Collins (2012), p 210.
(3) R. Phillips, Mushrooms, Macmillan (2006), p 99.
(4) D. Arora, Mushrooms Demystified, Ten Speed Press, Berkeley (1986), p 170, (M. melaleucas.lat.)
Based on microscopic features: Spores warty. Dimensions: 7,1 [7,8 ; 8] 8,7 × 4,6 [4,9 ; 5] 5,3 micr., Q = 1,4 [1,6] 1,8; N = 40; C = 95%; Me = 7,9 × 5 mm ; Qe = 1,6. Cheilocystidia dimensions: 55 [65,3 ; 72,1] 82,4 × 8,7 [11,5 ; 13,3] 16,1 micr., Q = 4,3 [5,3 ; 5,9] 6,9; N = 16; C = 95%; Me = 68,7 × 12,4 micr.; Qe = 5,6. Olympus CH20, NEA 100x/1.25, magnification 1.000 x, oil (spores), NEA 40x/0.65, magnification 400x (asci, cystidia), in water, Congo red. AmScope MA500 digital camera.
Based on chemical features: Taste mild, mushroomy, pleasant, somewhat sweet; smell none.

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2014-11-08 15:24:27 CST (-0500)
Last modified: 2014-11-08 15:29:11 CST (-0500)
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