Mycena lohwagii Singer

Beih. bot. Zbl. 46(2): 93 (1930).

© Leif Örstadius

Densely cespitose on fern rhizomes, mainly of Athyrium filix-femina. Autumn. Listed as rare in The Red List Of Threatened Fungi In Norway. See the records in The Norwegian mycological Database.

Pileus 3-7 mm across, parabolical, campanulate, broadly conical, with a small papilla or somewhat truncate, shallowly sulcate, translucent-striate, glabrous, pale brown to whitish, often with a dark brown centre and pallid to white margin. Lamellae 14-17 reaching the stipe, ascending, broadly adnate to somewhat decurrent, white, the edge concave to horizontal, concolorous. Stipe 20-50 x 0.5-1 mm, equal or somewhat broader at the apex, straight to curved, glabrous, cartilaginous, pale yellow-brown, whitish apex and darker below, the base covered with long, coarse fibrils. Odour none.

Basidia 16-27 x 7-9 µm, clavate, 4-spored. Spores 7.5 - 9.8 x 4.5 -5.7 µm, q = 1.3-1.8, qav = 1.5, broadly pip-shaped, smooth, amyloid. Cheilocystidia 16-33 x 10-17 µm, forming a sterile lamellar edge, clavate to obpyriform, apically covered with cylindrical excrescences 1 - 7 x 0.5 µm. Pleurocystidia absent. Hyphae of the pileipellis 3-12 µm wide, densely covered with cylindrical excrescences up to 3 x 0.5 µm. Hyphae of the cortical layer of the stipe 1 - 5 µm wide, smooth to sparsely covered with minute warts to cylindrical excrescences 0.5-1 x 0.5 µm, terminal cells clavate, diverticulate. Clamp connections present but not always easy to detect.

See further microscopic figures.

The macroscopic description is based on one Norwegian collection (Aronsen A 59/94), and the microscopic description refers to one Swedish and four Norwegian collections.

Mycena lohwagii is a member of sect. Polyadelphia Singer ex Maas Geest. where it occupies an unique position in the way the stipe is attached to the substratum, that is, neither by radiating mycelial filaments nor by being insititious, but by long and coarse fibrils (Maas Geesteranus, 1982: 268). It is readily identified by the occurence on fern rhizomes, the pale colour of the pileus, the broadly adnate attachment of the lamellae, and the cheilocystidia with fairly short cylindrical excrescences.

Mycena pterigena (Fr.) P. Kumm., also growing on ferns, where it can be found together with M. lohwagii, is a more diminutive species with reddish to pink colours of the pileus, the lamellar edge and the stipe. It may, however, occur in white, albino forms. The differences between M. lohwagii and albino M. pterigena are tabulated below.

Lamellae reaching stipe
Apical excrescences of the cheilocystidia
densely cespitose
14 - 17
the base covered with coarse fibrils
short only
albino pterigena
scattered to gregarious
7 - 11
the base attached to the substratum by radiating fibrils
short, mixed with very long ones

Go to key to sect. Polyadelphia.



© Arne Aronsen 2002-2015