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Mycena erubescens Höhn.

Sber. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. 1 122(1): 267 (1913)

© A. Aronsen 11 Nov. 2008
VESTFOLD, Tjøme, Rød 


Solitary, in small groups or subfasciculate on moss-covered trunks of deciduous trees (Acer, Fagus, Quercus). Rather frequent in Vestfold, but also found in other Counties. Listed as NT in The Red List Of Threatened Fungi In Norway. See the records in The Norwegian Mycological Database.

Pileus 5-15 mm, hemispherical, conical, campanulate to convex, dry, sulcate, translucent-striate, pruinose, glabrescent, sometimes at first bluish to bluish grey becoming brown, darker in the centre, or dark blackish brown with bluish black centre, fading to pale brown with the centre somewhat darker. Lamellae 15-21 reaching the stipe, ascending, narrowly adnate, occasionally with a short decurrent tooth, white to grey-white or sometimes pale brown, the edge paler, occasionally with red spots. Stipe 10-45 x 0.5-1.5 mm, equal, terete, hollow, straight to curved, pruinose, glabrescent, somewhat cartilaginous, at first greyish brown to brown with bluish apex, then grey-brown to dark brown, exuding a watery-whitish fluid when cut; the base covered with long, white fibrils. Flesh sometimes turning faintly red when cut. Odour indistinctive. Taste very bitter.

Basidia 22-28 x 8-11µm, clavate, 2-spored (rarely 4-spored), with plump sterigmata 7-10 µm long. Spores (7.8-)9.5-12 x 6.5-8.5(-9.0) µm, Q = 1.3-1.7, Qav ≈ 1.5, broadly ellipsoid, smooth, amyloid. Cheilocystidia 20-66 x 8-19 µm, forming a sterile band, strikingly variable, fusiform, smooth, sometimes narrowed into a shorter or longer neck, or clavate, covered with few to numerous, coarse, simple to branched, straight to curved or flexuous excrescences 3.5-11 x 1.5-2.5 µm, or all kinds of intermediate shapes. Pleurocystidia numerous, fusiform, often longer than the cheilocystidia, generally filled with refractive globules. Lamellar trama dextrinoid. Hyphae of the pileipellis 1.5-3 µm wide, covered with more or less curved, simple to branched, cylindrical excrescences 3-10(-20) x 1-2 µm, which may form dense masses and tend to become somewhat gelatinized. Hyphae of the cortical layer of the stipe 1.5-3.5 µm wide, fairly sparsely covered with cylindrical, simple to occasionally branched, straight to curved, excrescences 2-15 x 1-2 µm, terminal cells infrequent, diverticulate. Clamp connections generally absent, but present in 4-spored form.

More microscopic figures.

Mycena erubescens belongs to sect. Lactipedes (Fr.) Quél. It is identified by:

  • occurence on moss-covered trunks of deciduous trees
  • bitter taste
  • watery milky fluid in the stipe
  • flesh more or less reddening when exposed to the air
  • strikingly variable cheilocystidia
  • fusiform pleurocystidia, often filled with refractive globules
  • broadly pip-shaped spores

 

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