wood of deciduous trees. Autumn. Rare.
Pileus up to 28
mm across, convex, with a low umbo, glabrous, somewhat waxy-shiny,
sulcate, translucent-striate, dark brown, blackish brown
at the centre, fairly pale at the margin. Lamellae
subdistant, ascending, narrowly adnate, fairly broad and
thick, whitish. Stipe up to 55
x 3 mm, hollow, straight to curved, somewhat widened towards
the base, glabrous except for a pruinose apex, somewhat
fibrillose in lower parts, brown, the apex greyish, the
base dark brown.
Basidia 27-33 x 6.5-9 µm, clavate, 4-spored,
7 - 9 x 4.8 - 5.5 µm, Q = 1.4-1.6, pip-shaped, amyloid. Cheilocystidia
55 - 77 x 11 - 19 µm, smooth, fusiform to lageniform,
clamped, occurring mixed with the basidia (lamellar edge
similar. Lamellar trama dextrinoid. Hyphae of the pileipellis
smooth, clamped, embedded in gelatinous matter. Hyphae of the cortical layer
of the stipe smooth, clamped, caulocystidia
29 - 44 x 5 - 9 µm, clavate, smooth.
The description above has been taken from one single Norwegian record and unfortunately it is somewhat insufficient. The identification is in accordance with Maas Gesteranus' (2016) concept. He examined the collection and confirmed the identity.
Mycena algeriensis was described
as a new species from Algerie by Kühner (1938), and
seems to be rare in Europe (Kühner & Romagnesie
1953: 106). The species is still poorly understood. Kühner (1938: 493) pointed at the close
relationship to Mycena jacobi Maire (= M.
niveipes (Murill) Murill) but accepted
M. algeriensis, somewhat reluctantly, as a separate
species. Malençon & Bertault (1975: 225) also
discussed the relationship to M. niveipes.
It seems that Mycena algeriensis
can be separated from M.
niveipes on account of a darker pileus,
and that the cystidia are more obtusely rounded at the apex.
Typical M. niveipes has a grey, almost white pileus
and a pale silvery-grey or whitish-grey stipe. According to Maas Geesteranus (1988a) Mycena
algeriensis can be separated from M. niveipes as follows: In M. niveipes the stipe is (very)
fragile and bluish white to greyish white when young, turning
white later on; the hyphae of the pileipellis are not embedded
in gelatinous matter. In M. algeriensis, the stipe
is elastic-cartilaginous and grey-brown to dark sepia brown;
the hyphae of the pileipellis are embedded in gelatinous
In the original description it is pointed
out that Mycena algeriensis sometimes resembles
and M. polygramma
sometimes is quite similar too. Both species can be distinguished
by the cystidia.
The odour in the original description was described
as 'nitreuse parfois faible' (Kühner 1938: 492). Malençon
& Bertault (1975: 224) described the odour as 'chlorée
ou de pétales froissées de Papaver rhoseas(!)'.
Maas Geesteranus (1988a: 58), however, hesitated to accept
that Malençon & Bertault had identified the correct
species. He claimed that the odour is 'nitrous, although
Emmett et al. (2008: 387) referred to a Finnish record indicating absence of clamps. It seems relevant to point at the related species M. niveipes which appears both with and without clamps.
Emmett (pers. comm.) has recently studied the type of M. algeriensis and believes the northern European taxon belongs elsewhere (see Aronsen & Læssøe 2016). In my opinion, it is not likely that the taxon Maire described from eucalypt trunks in Algeria is identical with the various collections from Northern Europe. Some of the collections indicate some species of Hydropus, but at least a part of Scandinavian material is a genuine yet not fully understood species of Mycena.