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06-04-2015 17:25

Enrique Rubio Enrique Rubio

Hi to all Few days ago I have found these small

07-04-2015 14:26

Blasco Rafael Blasco Rafael

Hola, tengo esta Rosellinia recogida sobre rama ca

06-04-2015 19:23

Alain BRISSARD

Bonsoir à tous Votre avis me sera précieux au s

31-03-2015 22:07

Garcia Susana

Hello: I found a group of apothecia growing on th

05-04-2015 19:46

Jenny Seawright Jenny Seawright

Hello all, Black disco found on thin dead twigs of

03-04-2015 18:48

Steve Clements

Cistella , Arachnopeziza?Found March 24 2015 on a

05-04-2015 16:40

Bernard CLESSE Bernard CLESSE

Un facile, sur branchettes de Tilia platyphyllos,

05-04-2015 10:42

Castillo Joseba Castillo Joseba

Tengo unos ejemplares de Trichoglossum que estan

01-04-2015 21:39

Bernard CLESSE Bernard CLESSE

Sur tranche de coupe de tronc complètement pourri

04-04-2015 12:26

Bernard CLESSE Bernard CLESSE

Une forme imparfaite d'un asco ou d'un hétérobas

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Strossmayeria on Rubus canes
Enrique Rubio, 06-04-2015 17:25
Enrique RubioHi to all

Few days ago I have found these small fruitbodys growing on old wet stems of Rubus grex fruticosus at the sea level. Here is my description of this fungus.


Apothecia superficial, gregarious, scattered among the blackish brown setae of the conidiophores of a dematiaceous mould (Pseudospiropes?), narrowly turbinate, more or less gelified, whitish to amber color, up to 0.30 x 0.25 mm, substipitate on a short and stout pseudostipe 0.12 high and 0.15 broad. Hymenium flattened, smooth or only slightly pruinose. Margin involute, glabrous, that exceeds the hymenium level. Excipulum glabrous and whitish.


Asci narrowly clavate, inoperculate, unitunicate, 137-182 x 19-20 µm, 8-spored, IKI negative, arising from croziers. Ascospores biseriate, hyaline, smooth, with many small LBs, very polymorphic, ellipsoidal, cylindrical, subfusoid, obovoid, clavate, (19-)30(-38) x (5.2-)6.9(-9.8) µm; Q = (1.9-)4.6(-6.9), with 3(-5-6) cross septa only well visible in Melzer's reactive or congo red. A more or less smooth and complete gel sheath surrounds the fresh ejected ascospores. Paraphyses filiform, septate, not enlarged at their tips or only up to 2-2.5 µm, with cylindrical Vbs. Ectal excipulum textura oblita with cylindrical, elongate, septate, hyaline cells 2-2.5 µm, with a thin gel layer between them, wider at the apothecial base. Medullary excipulum is indistinguishable


The basal region of the ascomata stained blue in IKI. All the apothecial tissues extrude in fresh condition a bright yellow fluid in KOH 10%.


After reading Iturriaga & Korf's paper I don't know a species that fits well with this fungus.


Could you help me?


Thanks again

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Hans-Otto Baral, 06-04-2015 19:53
Hans-Otto Baral
Re : Strossmayeria on Rubus canes
Hi Enrique

I have also my problems with Iturriaga's paper, I never came clear with it. But I have also problems to recognize more than one species in this genus. Maybe ther exist tropical species, but in our region I think it is always S. basitricha. Perhaps until someone finds genetical differences.

Did you see anything that is unusual in your fungus compared to S. basitricha on wood?

I remember an amyloidity of the spores in Iturriaga's paper, am I right? Perhaps to obtain only with overmature dead spores, similar as in D. connivens.
Enrique Rubio, 06-04-2015 20:15
Enrique Rubio
Re : Strossmayeria on Rubus canes

Hi Zotto


Yes. I see some differences with the 'common' basitricha on wood with more septate cylindrical ascospores with a narrower verrucose gel sheath and broader paraphyses tips. I have not seen the amyloid reaction on my fresh spores but I pressume that Iturriaga & Korf's observations were made allways on dried material. 


This picture was take from an old collection from Robinia pseudoacacia


Thanks again


 

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Enrique Rubio, 06-04-2015 20:44
Enrique Rubio
Re : Strossmayeria on Rubus canes
More detail
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Hans-Otto Baral, 06-04-2015 21:57
Hans-Otto Baral
Re : Strossmayeria on Rubus canes
Yes, you are right! Spores and asci distinctly wider, spores 3-6-septate (basitricha 7-septate), warted gel in basitricha....
Enrique Rubio, 07-04-2015 16:51
Enrique Rubio
Re : Strossmayeria on Rubus canes
Thanks again, Zotto