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Scutellinia subhirtella ??
Francisco SÁNCHEZ, 19-08-2017 20:32
Francisco  SÃNCHEZHi.
This collection of Scutellinia were collected in Norway, on 07/28/17, on bark of a branch, probably of birch, semisumergida in a stream. The apothecia measures 3-8 mm.

Ellipsoidal ascospores with verrucous decoration very little visible in the spore contour, without forming crests and of length< 5 µm


(18.5) 20.3 - 23.5 (24.9) × (11.2) 11.9 - 13.6 (14.5) µm
Q = (1.5) 1.6 - 1.8 (2); N = 25
Me = 21.7 × 12.6 µm; Qe = 1.7

Ascas inamiloides 
(234.3) 237.3 - 298.1 (308) × (14.7) 15.2 - 20.3 (23) µm


Hairs of the margin quite long and with the pale apex and frequently bifurcated base, of
(289.1) 387.3 - 1394.2 (1531.1) x (17.7) 23.8 - 32.3 (33.8) µm


Much shorter external face hairs


Often bifurcated at the base (226.4) 229.8 - 272 (276.5) × (6.8) 9 - 10.9 (12.1) µm

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Viktorie Halasu, 20-08-2017 21:11
Viktorie Halasu
Re : Scutellinia subhirtella ??
Hello,

I'm not sure, if all the measured spores are mature. Mature (ejected) spores I only saw completely filled with small lipid guttules. That two groups pattern (as in some spores in your photo, e.g. bottom left corner) I saw only when they were still in ascus. 
I would exclude subhirtella, the hairs are about twice so long here. It is probably something from the long-haired group S. crinita, S. scutellata and S. pilati, I think the hair base is wide and short with many roots, the roots sometimes branching.
If the ornamentation is visible on the spore outline with 40x objective, it should exclude S. pilati (which has only up to 0,3-0,4 um high ornamentation, visible on the outline only with immersion). If you don't have sporeprint, you can try to make a preparate from a little piece from the middle of the hymenium - the spores should be most mature there. I wouldn't be surprised if it's S. crinita. 

Viktorie
Francisco SÁNCHEZ, 21-08-2017 11:13
Francisco  SÃNCHEZ
Re : Scutellinia subhirtella ??
Hello Viktorie.

Measures of ascospores are taken on those that were expelled from the ascas, and only the second spore above contained lipid gut evident from all spores measured, I suppose because it was immature and had not yet developed sporal ornamentation. I believe that mature spores are covered with short warts, barely visible in the contour.


The length of the hairs of the margin is (123) 230.6 - 1338.9 (1539.5) ?m
N = 60, however the mean is 561.8 ?m, and only a few of them> 800 ?m


The length of the receptacle hairs is (181.6) 189.4 - 370.9 (432.8) ?m
N = 17, and the mean of 281.3 ?m.


The root is usually bifurcated, although in the hairs of greater length is something more branched.

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Nicolas VAN VOOREN, 22-08-2017 07:44
Nicolas VAN VOOREN
Re : Scutellinia subhirtella ??
Usually the spore ornamentation of S. subhirtella is visible in CB. Can you try to show us some ascospores in CB showing more clearly the ornamentation?
Francisco SÁNCHEZ, 08-09-2017 19:20
Francisco  SÃNCHEZ
Re : Scutellinia subhirtella ??
Hello Viktorie and Nicolas.

I have observed spores in Lactophenol Blue and I do not see the decoration clearly, the spores seem rather smooth. What do you think?


Greetings.

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Malcolm Greaves, 08-09-2017 21:27
Malcolm  Greaves
Re : Scutellinia subhirtella ??
I would be looking at S pilati. Although we cannot see the ornamentation well it does not look prominent enough for S subhirtella. The dimentions of the hairs and spores are a good fit as is the habit.
Mal
Francisco SÁNCHEZ, 09-09-2017 00:14
Francisco  SÃNCHEZ
Re : Scutellinia subhirtella ??
Thank you for your opinion, Mal.

The spore length of my collection is more similar to S.crinita.

Malcolm Greaves, 09-09-2017 00:57
Malcolm  Greaves
Re : Scutellinia subhirtella ??
Your spores have a maximum size of 24.9 x 14.5 and according to Schumacher the length for S pilati is 21-27.4 with a width of 13.6-16.4. S crinita is 16.6-21.2 x 11.1-13.8 so I would say your spores are a better fit for S pilati.
Mal
Ps Benats key has S crinita with a maximum spore size of 19.5 x 12
Francisco SÁNCHEZ, 11-09-2017 09:50
Francisco  SÃNCHEZ
Re : Scutellinia subhirtella ??
Thank you very much. Mal, I will keep your opinion very much in mind.
Francisco SÁNCHEZ, 13-09-2017 00:37
Francisco  SÃNCHEZ
Re : Scutellinia subhirtella ??
I have also observed hyaline structures with apical elements wider than those of the paraphyses, from (29.3) 30.5 - 45.6 (52.6) × (13.1) 15.8 - 23.9 (29) ?m

What is your opinion?

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Malcolm Greaves, 13-09-2017 21:26
Malcolm  Greaves
Re : Scutellinia subhirtella ??
I have seen this on one or two occasions in different species most notably this S torrentis from earlier this year. I don't think it is of any significance.
Mal
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Viktorie Halasu, 14-09-2017 08:04
Viktorie Halasu
Re : Scutellinia subhirtella ??
This was termed "fortoulism" by Donadini (after the mycologist J.Fortoul), who distinguished two types - either is it a typical character for some species (Peziza varia and P. vesiculosa), or it develops in certain conditions only (high humidity and frequent temperature changes). R. Dougoud in his Contribution à l'étude des Discomycètes (1992) writes that in some other Peziza spp. he observed it to develop after a few days in the fridge.
Francisco SÁNCHEZ, 14-09-2017 08:37
Francisco  SÃNCHEZ
Re : Scutellinia subhirtella ??
That's right, my collection spent many days in the refrigerator before its study, and clearly has developed "fortoulisme phénotypique" that you comment.

I transcribe the text of Rene's work.


Mal and Viktorie, thank you very much for your information. Greetings.

 CONTRIBUTION A L'ETUDE DES DISCOMYCETES. (1994) René Dougoud. Documents Mycologique, tome XXIV, fascicule 93. pp.9-10


"DONADINI (1980 a) décrit pour le genre Peziza (Dill) Lin., l'aptitude des cellules de la chair et des paraphyses à évoluer de la forme cylindrique à celle moniliforme à piriforme globuleuse, et il nomme fortoulisme cette évolution (Pl. VI, fig. 4). Il distingue deux types:

a) Le fortoulisme génotypique, caractérisé par P. varia Hedwig : Fr. et dans une moindre mesure par P. vesiculosa Bulliard :Fr., aux paraphyses peu moniliformes dans la jeunesse, mais le devenant toutes vers la maturité, en particulier à la base.

b) Le fortoulisme phénotypique de P. nivalis (Heim & Remy) Moser et de sa variété fortoulii (Donadini & Neville) Donadini est, pour l'essentiel, le résultat de conditions écologiques particulières (humidité très élevée du substrat et variation de la température)."