Observation 224271: Hydropus Kühner ex Singer
When: 2015-11-21
Who: zaca
No herbarium specimen

Notes: A group of very small specimens (max. cap diameter 1.5 cm) growing on wood.

The microscopic features of these specimens are somewhat distinctive:
- Spores hialine, smooth, broad ellipsoild to oblong with dimensions:
(6.7) 7.5 – 8.3 (9.1) x (4.2) 4.8 – 5.4 (5.9) µm
Q = (1.3) 1.4 – 1.7 (1.9) ; N = 26
Me = 7.9 × 5.1 µm ; Qe = 1.6
Gill edge full of cheilocystidia with many different forms (see the photos);
Stiptipellis also with different shaped caulocystidia (see the photos);
Pileipellis formed by some inflated hyphae, light brown pigmented, sometime some thin and diverticulate hypae are present; the subpellis is very rarified of hyphae; no pileocystidia were observed.
I was looking to the reference to the different genera of Tricholomataceae and found some similarities to the genus Hydropus and particularly to H. moserianus, which however has pileocystidia. Of course, it may also belong to a related genus.

Images

580029
580030
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580034
Microscopy: Spores;
580035
Microscopy: Cheilocystidia-1;
580036
Microscopy: Cheilocystidia-2;
580037
Microscopy: Cheilocystidia-3;
580038
Microscopy: Pileipellis;
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Microscopy: Pileipellis ans subpellis;
580040
Microscopy: Stiptipellis showing immersed caulocystidia;
580041
Microscopy: Caulocystidia-1;
580042
Microscopy: Caulocystidia-2.

Proposed Names

58% (1)
Eye3 Eyes3
Used references: Flora Agaricina Neerlandica, Vol. 4
Based on microscopic features

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2015-12-02 02:56:24 PST (-0800)
Last modified: 2015-12-02 02:56:45 PST (-0800)
Viewed: 19 times, last viewed: 2016-10-25 14:32:41 PDT (-0700)
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