Mycena crocata (Schrad.) P. Kumm.

Führer Pilzk. (Zwickau): 108 (1871)

© A. Aronsen
DENMARK, Fredericia, Trelde Næs 24 Sept. 2017

Among fallen leaves and on fallen, decaying branches in Fagus sylvatica woods, more rarely on other hardwood, such as Alnus and Betula. Late summer to late autumn. Regular but not in great numbers where Fagus occurs.

Pileus 5-25(-38) mm across, conical or campanulate to parabolical with a small papilla, pruinose, glabrescent, shallowly sulcate, little translucent-striate, dark red-brown at the centre, orange-brown to grey brown farther outwards, paler to grey or whitish towards the margin, stained with yellow-red to orange-red spots. Lamellae 15-25 reaching the stipe, ascending, narrowly adnate, white, stained with yellow-red to orange-red spots. Stipe 50-95 x 1-2(-4) mm, hollow, equal, straight to somewhat curved, firm, pruinose to minutely puberulous all over, more or less glabrescent, often remaining pruinose at the apex, glabrous below, shiny, pale yellow to orange yellow above, darker orange below, bright orange to reddish at the base, rooting; exuding safran-red juice when cut, the base densely covered with long, coarse, whitish to orange-yellow fibrils. Odour indistinctive

Basidia 25-37 x 8-10 µm, clavate, 4-spored, with sterigmata 5-7 µm long. Spores 8.2-11.5 x 5-7 µm, Q 1.4-1.8, Qav 1.6, pip-shaped, smooth, amyloid. Cheilocystidia 13-32 x 7-14 µm, forming a sterile band, clavate, covered with not very numerous, evenly spaced, simple, cylindrical, straight to somewhat curved excrescences 1-8 x 0.9-2 µm, sometimes longer, irregularly inflated and branched. Pleurocystidia scarce, clavate, smooth or with few excrescences. Lamellar trama weakly dextrinoid. Hyphae of the pileipellis 1-4 µm wide, covered with simple to furcate or somewhat branched excrescences 1-6.5 x 1-2 µm. Hyphae of the cortical layer of the stipe 1-3 µm wide, sparsely covered with simple, cylindrical excrescences 1-5.5 x 0.5-1 µm, terminal cells 3.5-7 µm wide, subcylindrical to clavate, diverticulate. Clamp connections present at all tissues.

Microphotos of cheilocystidia 1.

Microphotos of cheilocystidia 2.

Mycena crocata is the only species in sect. Crocatae Maas Geest. It is very characteristic with the yellow-red to orange-red stains and the reddish juice in the stipe, in addition to the habitat.

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© Arne Aronsen 2002-2023