Growing among mosses, mainly in alpine and arctic areas. Summer to autumn.
Pileus brown to greyish black. Lamellae white to pale grey.
Stipe citrine yellow at first, turning dark greyish brown
above with age.
Basidia 33-40 x 6-8 μm, narrowly clavate, 2-spored,
with sterigmata up to 7 μm long. Spores
10.8-12 x 6-7 μm, pip-shaped. Cheilocystidia 12-15
x 6-7 μm, occuring mixed with basidia, clavate, covered with unevenly spaced,
coarse, simple to somewhat branched, straight to curved,
coarse excrescences. Hyphae of the pileipellis branched,
covered with simple to branched excrescences. Clamp connections absent.
Microphotos of cheilocystidia
This variety has been recorded in alpine and subalpine
areas in Norway. (See Gulden & Jenssen, 1982). The dark
pileus, which can be almost black at the center, the 2-spored
basidia, and the absence of clamp connections are important
characters. I have occasionally seen a few 4-spored basidia on the same lamella that is dominated by the 2-spored basidia. Whether this taxon represents a separate species should be investigated in future molecular studies.
Maas Geesteranus (1989: 93) described the lamellar edge
in var. epipterygia as homogeneous (the cheilocystidia
forming a sterile band). He did not mention anything on
this matter in var. badiceps. Gulden & Jenssen
(1982: 182), however, described the lamellar edge as sterile.
In fact the lamellar edge is mainly sterile, but partially the cheilocystidia occur mixed with basidia.
Fig.1. - 1. Cheilocystidia. 2. Spores. 3.
Bar = 20 μm.