Key to the European members
of Mycena sect. Basipedes

Maas Geesteranus (1992) divided the old section Basipedes into five new sections: Sect. Basipedes, sect. Bulbosae, sect. Clavulares, sect. Exiguae, and sect. Longisetae as follows:

Spores non-amyloid
  sect. Longiseta: Pileus surface with acute spinules, clampless (M. longiseta=M. aciculata)
  sect. Bulbosae: Pileus surface without spinules, clamped (M. bulbosa)
Spores amyloid
  sect. Clavulares: Spores subglobose, lamellae forming a pseudocollarium, stipe springing from a basal disc, clampless, dermatocystidia absent (M. clavularis)
  sect. Exiguae: Spores subglobose, lamellae attached to the stipe, stipe bulbous, not springing from a basal disc, with clamps, dermatocystidia present (M. marocana)
  sect. Basipedes: Spores pip-shaped to almost cylindrical, lamellae forming a pseudocollarium (M. mucor, M. rhenana, M. stylobates, and M. tenuispinosa)

In the wiev of Maas Geesteranus Mycena sect. Basipedes (Fr.) Quél. comprises four species in Europe of which two are reported from Norway. The species are Mycena mucor (Batsch) Quél., M. rhenana Maas Geest. & Winterhoff, M. stylobates (Pers.) P. Kummer, and M. tenuispinosa Favre. The recently described M. mucoroides Aronsen also is a member of this section.

1. Cheilocystidia absent. Odour nitrous. Terminal cells of the pileipellis inflated, densely covered with warts. Caulocystidia broad, smooth. Typically growing on fallen debris of Alnus glutinosa: M. rhenana
1. Cheilocystidia present.
  2. Cheilocystidia with narrow excrescences 1-2 µm wide.
    3. Odour none. Pileal surface smooth. Spores 3-4.5 µm broad. Caulocystidia narrow, often furcate. Growing on fallen, decaying leaves of Quercus: M. mucor
    4. Odour none. Pileal surface densely covered with acute spinules. Spores 4.5-6 µm broad: M. tenuispinosa.
  2. Cheilocystidia with coarse, inflated excrescences
    5. Basal disc with a ciliate margin; caulocystidia fusiform; pileipellis without acanthocystoid cells: M. stylobates
    6. Basal disc without a ciliate margin; caulocystidia short, variously shaped; pileipellis with acanthocystoid terminal cells: M. mucoroides

The information that Mycena rhenana lacks cheilocystidia may possibly prove not to be entirely true. According to Maas Geesteranus & Winterhoff (1985) thorough search in three different collections did not reveal any cheilocystidia. I have examined ten collections with the same result. If it very rarely should prove to possess cheilocytidia, it would after all be identified by the nitrous smell, and by the inflated terminal cells of the pileipellis and the caulocystidia.


© Arne Aronsen 2002-2016