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Riet van Oosten
Hello, Found by Laurens van der Linde, Nov. 2025
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Viktorie Halasu
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Josep Torres
Hello.A tiny ascomycete, appearing as erupting gra
Buenas tardesEl día 7/6/2023 encontré en Tenerife este Pyrenomycete bastante carbonáceo, muy pequeño, de 200-300 micras de diámetro, sobre madera de brezo (Erica arborea) o faya (Myrica faya). Las ascas tienen un pie larguísimo, son IKI- y tienen 8 esporas cilíndrico alantoides con una gútula oscura en cada extremo. No he visto paráfisis, y en su lugar hay una masa de hifas con terminaciones muy refringentes, sobre todo en IKI.
Medidas de las ascas:
(80,6) 95,3 - 136,2 (163,4) × (4,3) 5 - 6 (6,3) µm
N = 18; Me = 115,2 × 5,4 µm ; Qe = 21,7
Medidas de las esporas (Medidas de punta a punta, no siguiendo la curvatura):
(5,6) 6,2 - 8,4 (8,8) × (1,3) 1,5 - 2 (2,2) µm
Q = (2,9) 3,4 - 5,1 (5,7) ; N = 45
Me = 7,3 × 1,8 µm ; Qe = 4,2
En Canarias están citadas Eutypella canariensis, E. euphorbiae y E. leprosa. De las 2 primeras prácticamente no hay documentación, y la tercera no se parece.
Gracias por vuestra ayuda.
Miguel Á. Ribes
In Diatrypaceae, the morphology of the stroma is essential to the genus placement.
Regularly spaced single perithecia suggest Eutypa rather than Eutypella in which several perithecia are collectively erumpent though a common disc, with more or less prominent ostioles.
I don't see ostioles on your photos and it's only a guess that the small protuberances are not ostioles but perhaps superficial parasites, or maybe pycnidia. The hemispherical superficial part should be elucidated by sections in close-up to assess whether it is an ostiolar structure or what else.
Photos 6-7-8 recall a possible libertella-like asexual morph, I wonder if it comes from the perithecial contents or from the superficial pycnidia.
Your collection is really worth a thorough study.
Good luck!
Jacques
Interesting, two mushrooms in one.
Indeed, in the cuts that I have made I have not seen ostioles. I will try to make cuts and photos with more magnification of the superficial bumps that cover the perithecia. I will also try to take photos of the structure of the perithecia, although they were quite carbonaceous. All the micro photos that I have sent correspond to the interior of the perithecia that are seen at the bottom of the macro photos with cuts that I have sent, that is, the asci that I show and the possible libertella-like asexual morph of photos 6 -8 are of the same origin, from the interior of the perithecia, with complete certainty.
When I have more information I will send it again.
Thanks for your help Jacques. A hug.
In this message I send more photos of the Eutypa (and the Berlesiella on top), to see if it can be identified with this, and in the next message I send data on the Berlesiella.
Perithecia: 480 x 330 microns (height x width)
Miguel Á. Ribes
Perithecia: 121 x 86 microns (height x width)
Spores: multiseptate (4-6), colored, 17.1 x 6.1 microns
Hairs: dark, thick-walled, very short, 10.5 x 4.1 microns.
Parece Capronia nigerrima, antes Berlesiella, un parásito común sobre estromas de Eutypa.
Un abrazo.
Con la clave de Gernot Friebes (2012) llego a esa especie. Ya he visto tus láminas.
Muchas gracias. Un abrazo.