Growing on decaying coniferous
wood. Often found at the base of Picea or Pinus.
Autumn. See the records in The Norwegian Mycological Database.
Pileus up to 40
mm across, conical to campanulate, becoming almost plane
with umbo, sulcate, translucent-striate, glabrous, somewhat
lubricous when wet, at first dark brown with almost blackish
violet centre and pale brown margin, with a violet shade,
becoming grey brown or grey to dark grey with a somewhat
darker centre, and a faint violet shade. Lamellae
22 - 30 reaching the stipe, ascending, narrowly adnate,
sometimes decurrent with a short tooth, dorsally intervenose
with age, white to grey with a very distinct violet edge.
Stipe up to 70 x 3(-5) mm, hollow,
terete, equal or somewhat widened below, straight to curved,
pruinose, glabrescent, smooth, but with age somewhat grooved
lengthwise, grey-brown to greyish violet, towards the base
usually darker brown with a violet shade, the base covered
with white fibrils, often rooting. Odour
none.
Basidia 30-36 x 10-11.5 μm, clavate, 4-spored.
Spores (7.5-)8.2-12.0 x 5.5-6.7
μm, broadly pip-shaped, amyloid. Cheilocystidia
23-61 x 9-29 μm, utriform, subcylindrical, smooth and
apically usually broadly rounded, with lilaceous contents.
Pleurocystidia absent. Lamellar trama faintly reddish brown or vinaceous brownish in Melzer's reagent. Hyphae of the pileipellis up to 4.5 μm wide, smooth to sparsely covered with warts or fairly coarse, cylindrical excrescences up to 11 μm long. Hyphae of the cortical layer of the stipe up to 3.5 μm wide, smooth or sparsely diverticulate, terminal cells narrowly clavate, to much wider and strongly curved, smooth or sparsely diverticulate. Clamp
connections generally absent or very rare.
Mycena purpureofusca is a member of sect Rubromarginatae Singer ex Maas Geest. It seems to be a rather common species in southern Norway.
Maas Geesteranus (1986c: 300-301) discussed how to separate it from M. rubromarginata and mentioned the cheilocystidia as a reliable character. The cheilocystidia of M. purpureofusca have broadly rounded apices, whereas those of M. rubromarginata have narrow necks. He also mentioned the clamp connections as a character to separate the two species. M. rubromarginata always have clamps, while in M. purpureofusca they are absent or very rare.
Further images on the Internet:
MykoWeb
CalPhotos |
