Observation 277184: Hebeloma lutense Romagn.

When: 2016-12-03

Collection location: Barragem da Póvoa e Meadas, Portalegre, Portugal [Click for map]

Who: zaca

No specimen available

Notes:
This date field trip as well as others in subsequent weeks were devoted to Hebeloma, after the request from Dr. Henry Beker for specimens in this genus. That request had as target NA species but my country, despite being european, was not very well represented in H. Beker’s herbarium and he would appreciate more material from here.
On the other hand, from my side, I would like to improve my knowledge of this genus, still very opaque to me and for many other people, judging from the information available in the internet. That’s reason why after knowing the results I made the microscopic observations, at least one for each species considered. It is like a “trapeze artist in the circus working with a network”, a strange and unusual sensation, in which the result is known from the beginning. Is just a way to learn a bit more …

The result of this field trip were three species, all identifyed by Dr. Beker’s team, after analysing the esxcicata and sequencing the specimens: H. cavipes (3 collections, dispersed by the zones visited), H. cistophilum (1 collection of 2 specimens) and H. lutense (several collections, some with several specimens).

This observation as well as other that follows is devoted to H. lutense. All the specimens found of this species grew in a special habitat, the margins of the reservoir of a dam, where the almost exclusive vegetation, except for herbaceous, is a Salix species (see the photos with the habitat). I grouped them by proximity in the field. Later on, one and and a half month, I returned to this place and found again plenty of specimens of this species, to be considered in forthcoming observations.

H. lutense is a member of section Denudata, subsection Crustuliformia [Denudata]. The features of the members of this subsection, to which the well-known H. crustuliniforme belongs, include:
- Smell usually more or less radish-like but sometimes absent;
- The lamellae usually with clear droplets but occasionally absent, particularly in dry weather, but then often leaving brown or rusty stains on the lamellae;
- Spores amygdaloid, sometimes with a papilla, with sizes: 9.1–13.7 × 4.9–7.7 µm, Qav 1.60–2.17;
- Cheilocystidia with a majority capitate-, clavate- or spathulate-stipitate.
A description of H. lutense can be seen at Ref. 1, available via Researche Gate.

Images

Microscopy: Cheilocystidia (x1000, in congo red);
Microscopy: Cheilocystidia (x1000, in congo red);
Microscopy: Cheilocystidia (x1000, in congo red);
Microscopy: Cheilocystidia (x1000, in congo red);
Microscopy: Spores (x1000, in congo red);
Microscopy: Cheilocystidia and spores (x1000, in lugol).
Habitat.
Habitat.

Proposed Names

87% (1)
Recognized by sight: My acknowledgment to Professor Henry Beker and Dr. Ursula Eberhardt who determined the Hebeloma species, based on the exsiccata that I sent them, including DNA sequencing.
Used references: U. Eberhardt1, H.J. Beker, J. Vesterholt: Decrypting the Hebeloma crustuliniforme complex: European species of Hebeloma section Denudata subsection Denudata (Agaricales); Persoonia 35, 2015: 101–147.

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Created: 2017-05-23 09:49:20 PDT (-0700)
Last modified: 2017-05-23 10:55:28 PDT (-0700)
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